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javax.servlet
Interface ServletContext

public interface ServletContext

Defines a set of methods that a servlet uses to communicate with its servlet container, for example, to get the MIME type of a file, dispatch requests, or write to a log file.

There is one context per "web application" per Java Virtual Machine. (A "web application" is a collection of servlets and content installed under a specific subset of the server's URL namespace such as /catalog and possibly installed via a .war file.)

In the case of a web application marked "distributed" in its deployment descriptor, there will be one context instance for each virtual machine. In this situation, the context cannot be used as a location to share global information (because the information won't be truly global). Use an external resource like a database instead.

The ServletContext object is contained within the ServletConfig object, which the Web server provides the servlet when the servlet is initialized.

Author:
Various
See Also:
Servlet#getServletConfig, ServletConfig#getServletContext

Field Summary
static java.lang.String ORDERED_LIBS
          The name of the ServletContext attribute whose value (of type java.util.List<java.lang.String>) contains the list of names of JAR files in WEB-INF/lib ordered by their web fragment names (with possible exclusions if <absolute-ordering> without any <others/> is being used), or null if no absolute or relative ordering has been specified
static java.lang.String TEMPDIR
          The name of the ServletContext attribute which stores the private temporary directory (of type java.io.File) provided by the servlet container for the ServletContext
 
Method Summary
 FilterRegistration.Dynamic addFilter(java.lang.String filterName, java.lang.Class<? extends Filter> filterClass)
          Adds the filter with the given name and class type to this servlet context.
 FilterRegistration.Dynamic addFilter(java.lang.String filterName, Filter filter)
          Registers the given filter instance with this ServletContext under the given filterName.
 FilterRegistration.Dynamic addFilter(java.lang.String filterName, java.lang.String className)
          Adds the filter with the given name and class name to this servlet context.
 void addListener(java.lang.Class<? extends java.util.EventListener> listenerClass)
          Adds a listener of the given class type to this ServletContext.
 void addListener(java.lang.String className)
          Adds the listener with the given class name to this ServletContext.
<T extends java.util.EventListener>
void
addListener(T t)
          Adds the given listener to this ServletContext.
 ServletRegistration.Dynamic addServlet(java.lang.String servletName, java.lang.Class<? extends Servlet> servletClass)
          Adds the servlet with the given name and class type to this servlet context.
 ServletRegistration.Dynamic addServlet(java.lang.String servletName, Servlet servlet)
          Registers the given servlet instance with this ServletContext under the given servletName.
 ServletRegistration.Dynamic addServlet(java.lang.String servletName, java.lang.String className)
          Adds the servlet with the given name and class name to this servlet context.
<T extends Filter>
T
createFilter(java.lang.Class<T> clazz)
          Instantiates the given Filter class.
<T extends java.util.EventListener>
T
createListener(java.lang.Class<T> clazz)
          Instantiates the given EventListener class.
<T extends Servlet>
T
createServlet(java.lang.Class<T> clazz)
          Instantiates the given Servlet class.
 void declareRoles(java.lang.String... roleNames)
          Declares role names that are tested using isUserInRole.
 java.lang.Object getAttribute(java.lang.String name)
          Returns the servlet container attribute with the given name, or null if there is no attribute by that name.
 java.util.Enumeration<java.lang.String> getAttributeNames()
          Returns an Enumeration containing the attribute names available within this ServletContext.
 java.lang.ClassLoader getClassLoader()
          Gets the class loader of the web application represented by this ServletContext.
 ServletContext getContext(java.lang.String uripath)
          Returns a ServletContext object that corresponds to a specified URL on the server.
 java.lang.String getContextPath()
          Returns the context path of the web application.
 java.util.Set<SessionTrackingMode> getDefaultSessionTrackingModes()
          Gets the session tracking modes that are supported by default for this ServletContext.
 int getEffectiveMajorVersion()
          Gets the major version of the Servlet specification that the application represented by this ServletContext is based on.
 int getEffectiveMinorVersion()
          Gets the minor version of the Servlet specification that the application represented by this ServletContext is based on.
 java.util.Set<SessionTrackingMode> getEffectiveSessionTrackingModes()
          Gets the session tracking modes that are in effect for this ServletContext.
 FilterRegistration getFilterRegistration(java.lang.String filterName)
          Gets the FilterRegistration corresponding to the filter with the given filterName.
 java.util.Map<java.lang.String,? extends FilterRegistration> getFilterRegistrations()
          Gets a (possibly empty) Map of the FilterRegistration objects (keyed by filter name) corresponding to all filters registered with this ServletContext.
 java.lang.String getInitParameter(java.lang.String name)
          Returns a String containing the value of the named context-wide initialization parameter, or null if the parameter does not exist.
 java.util.Enumeration<java.lang.String> getInitParameterNames()
          Returns the names of the context's initialization parameters as an Enumeration of String objects, or an empty Enumeration if the context has no initialization parameters.
 JspConfigDescriptor getJspConfigDescriptor()
          Gets the <jsp-config> related configuration that was aggregated from the web.xml and web-fragment.xml descriptor files of the web application represented by this ServletContext.
 int getMajorVersion()
          Returns the major version of the Servlet API that this servlet container supports.
 java.lang.String getMimeType(java.lang.String file)
          Returns the MIME type of the specified file, or null if the MIME type is not known.
 int getMinorVersion()
          Returns the minor version of the Servlet API that this servlet container supports.
 RequestDispatcher getNamedDispatcher(java.lang.String name)
          Returns a RequestDispatcher object that acts as a wrapper for the named servlet.
 java.lang.String getRealPath(java.lang.String path)
          Gets the real path corresponding to the given virtual path.
 RequestDispatcher getRequestDispatcher(java.lang.String path)
          Returns a RequestDispatcher object that acts as a wrapper for the resource located at the given path.
 java.net.URL getResource(java.lang.String path)
          Returns a URL to the resource that is mapped to the given path.
 java.io.InputStream getResourceAsStream(java.lang.String path)
          Returns the resource located at the named path as an InputStream object.
 java.util.Set<java.lang.String> getResourcePaths(java.lang.String path)
          Returns a directory-like listing of all the paths to resources within the web application whose longest sub-path matches the supplied path argument.
 java.lang.String getServerInfo()
          Returns the name and version of the servlet container on which the servlet is running.
 Servlet getServlet(java.lang.String name)
          Deprecated. As of Java Servlet API 2.1, with no direct replacement.

This method was originally defined to retrieve a servlet from a ServletContext. In this version, this method always returns null and remains only to preserve binary compatibility. This method will be permanently removed in a future version of the Java Servlet API.

In lieu of this method, servlets can share information using the ServletContext class and can perform shared business logic by invoking methods on common non-servlet classes.
 java.lang.String getServletContextName()
          Returns the name of this web application corresponding to this ServletContext as specified in the deployment descriptor for this web application by the display-name element.
 java.util.Enumeration<java.lang.String> getServletNames()
          Deprecated. As of Java Servlet API 2.1, with no replacement.

This method was originally defined to return an Enumeration of all the servlet names known to this context. In this version, this method always returns an empty Enumeration and remains only to preserve binary compatibility. This method will be permanently removed in a future version of the Java Servlet API.
 ServletRegistration getServletRegistration(java.lang.String servletName)
          Gets the ServletRegistration corresponding to the servlet with the given servletName.
 java.util.Map<java.lang.String,? extends ServletRegistration> getServletRegistrations()
          Gets a (possibly empty) Map of the ServletRegistration objects (keyed by servlet name) corresponding to all servlets registered with this ServletContext.
 java.util.Enumeration<Servlet> getServlets()
          Deprecated. As of Java Servlet API 2.0, with no replacement.

This method was originally defined to return an Enumeration of all the servlets known to this servlet context. In this version, this method always returns an empty enumeration and remains only to preserve binary compatibility. This method will be permanently removed in a future version of the Java Servlet API.
 SessionCookieConfig getSessionCookieConfig()
          Gets the SessionCookieConfig object through which various properties of the session tracking cookies created on behalf of this ServletContext may be configured.
 void log(java.lang.Exception exception, java.lang.String msg)
          Deprecated. As of Java Servlet API 2.1, use log(String message, Throwable throwable) instead.

This method was originally defined to write an exception's stack trace and an explanatory error message to the servlet log file.
 void log(java.lang.String msg)
          Writes the specified message to a servlet log file, usually an event log.
 void log(java.lang.String message, java.lang.Throwable throwable)
          Writes an explanatory message and a stack trace for a given Throwable exception to the servlet log file.
 void removeAttribute(java.lang.String name)
          Removes the attribute with the given name from this ServletContext.
 void setAttribute(java.lang.String name, java.lang.Object object)
          Binds an object to a given attribute name in this ServletContext.
 boolean setInitParameter(java.lang.String name, java.lang.String value)
          Sets the context initialization parameter with the given name and value on this ServletContext.
 void setSessionTrackingModes(java.util.Set<SessionTrackingMode> sessionTrackingModes)
          Sets the session tracking modes that are to become effective for this ServletContext.
 

Field Detail

TEMPDIR

static final java.lang.String TEMPDIR
The name of the ServletContext attribute which stores the private temporary directory (of type java.io.File) provided by the servlet container for the ServletContext

See Also:
Constant Field Values

ORDERED_LIBS

static final java.lang.String ORDERED_LIBS
The name of the ServletContext attribute whose value (of type java.util.List<java.lang.String>) contains the list of names of JAR files in WEB-INF/lib ordered by their web fragment names (with possible exclusions if <absolute-ordering> without any <others/> is being used), or null if no absolute or relative ordering has been specified

See Also:
Constant Field Values
Method Detail

getContextPath

java.lang.String getContextPath()
Returns the context path of the web application.

The context path is the portion of the request URI that is used to select the context of the request. The context path always comes first in a request URI. The path starts with a / character but does not end with a / character. For servlets in the default (root) context, this method returns "".

It is possible that a servlet container may match a context by more than one context path. In such cases the HttpServletRequest.getContextPath() will return the actual context path used by the request and it may differ from the path returned by this method. The context path returned by this method should be considered as the prime or preferred context path of the application.

Returns:
The context path of the web application, or "" for the default (root) context
Since:
Servlet 2.5
See Also:
HttpServletRequest.getContextPath()

getContext

ServletContext getContext(java.lang.String uripath)
Returns a ServletContext object that corresponds to a specified URL on the server.

This method allows servlets to gain access to the context for various parts of the server, and as needed obtain RequestDispatcher objects from the context. The given path must be begin with /, is interpreted relative to the server's document root and is matched against the context roots of other web applications hosted on this container.

In a security conscious environment, the servlet container may return null for a given URL.

Parameters:
uripath - a String specifying the context path of another web application in the container.
Returns:
the ServletContext object that corresponds to the named URL, or null if either none exists or the container wishes to restrict this access.
See Also:
RequestDispatcher

getMajorVersion

int getMajorVersion()
Returns the major version of the Servlet API that this servlet container supports. All implementations that comply with Version 3.0 must have this method return the integer 3.

Returns:
3

getMinorVersion

int getMinorVersion()
Returns the minor version of the Servlet API that this servlet container supports. All implementations that comply with Version 3.0 must have this method return the integer 0.

Returns:
0

getEffectiveMajorVersion

int getEffectiveMajorVersion()
Gets the major version of the Servlet specification that the application represented by this ServletContext is based on.

The value returned may be different from getMajorVersion(), which returns the major version of the Servlet specification supported by the Servlet container.

Returns:
the major version of the Servlet specification that the application represented by this ServletContext is based on
Throws:
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
Since:
Servlet 3.0

getEffectiveMinorVersion

int getEffectiveMinorVersion()
Gets the minor version of the Servlet specification that the application represented by this ServletContext is based on.

The value returned may be different from getMinorVersion(), which returns the minor version of the Servlet specification supported by the Servlet container.

Returns:
the minor version of the Servlet specification that the application xrepresented by this ServletContext is based on
Throws:
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
Since:
Servlet 3.0

getMimeType

java.lang.String getMimeType(java.lang.String file)
Returns the MIME type of the specified file, or null if the MIME type is not known. The MIME type is determined by the configuration of the servlet container, and may be specified in a web application deployment descriptor. Common MIME types include text/html and image/gif.

Parameters:
file - a String specifying the name of a file
Returns:
a String specifying the file's MIME type

getResourcePaths

java.util.Set<java.lang.String> getResourcePaths(java.lang.String path)
Returns a directory-like listing of all the paths to resources within the web application whose longest sub-path matches the supplied path argument.

Paths indicating subdirectory paths end with a /.

The returned paths are all relative to the root of the web application, or relative to the /META-INF/resources directory of a JAR file inside the web application's /WEB-INF/lib directory, and have a leading /.

For example, for a web application containing: 

   /welcome.html
   /catalog/index.html
   /catalog/products.html
   /catalog/offers/books.html
   /catalog/offers/music.html
   /customer/login.jsp
   /WEB-INF/web.xml
   /WEB-INF/classes/com.acme.OrderServlet.class
   /WEB-INF/lib/catalog.jar!/META-INF/resources/catalog/moreOffers/books.html
getResourcePaths("/") would return {"/welcome.html", "/catalog/", "/customer/", "/WEB-INF/"}, and getResourcePaths("/catalog/") would return {"/catalog/index.html", "/catalog/products.html", "/catalog/offers/", "/catalog/moreOffers/"}.

Parameters:
path - the partial path used to match the resources, which must start with a /
Returns:
a Set containing the directory listing, or null if there are no resources in the web application whose path begins with the supplied path.
Since:
Servlet 2.3

getResource

java.net.URL getResource(java.lang.String path)
                         throws java.net.MalformedURLException
Returns a URL to the resource that is mapped to the given path.

The path must begin with a / and is interpreted as relative to the current context root, or relative to the /META-INF/resources directory of a JAR file inside the web application's /WEB-INF/lib directory. This method will first search the document root of the web application for the requested resource, before searching any of the JAR files inside /WEB-INF/lib. The order in which the JAR files inside /WEB-INF/lib are searched is undefined.

This method allows the servlet container to make a resource available to servlets from any source. Resources can be located on a local or remote file system, in a database, or in a .war file.

The servlet container must implement the URL handlers and URLConnection objects that are necessary to access the resource.

This method returns null if no resource is mapped to the pathname.

Some containers may allow writing to the URL returned by this method using the methods of the URL class.

The resource content is returned directly, so be aware that requesting a .jsp page returns the JSP source code. Use a RequestDispatcher instead to include results of an execution.

This method has a different purpose than java.lang.Class.getResource, which looks up resources based on a class loader. This method does not use class loaders.

Parameters:
path - a String specifying the path to the resource
Returns:
the resource located at the named path, or null if there is no resource at that path
Throws:
java.net.MalformedURLException - if the pathname is not given in the correct form

getResourceAsStream

java.io.InputStream getResourceAsStream(java.lang.String path)
Returns the resource located at the named path as an InputStream object.

The data in the InputStream can be of any type or length. The path must be specified according to the rules given in getResource. This method returns null if no resource exists at the specified path.

Meta-information such as content length and content type that is available via getResource method is lost when using this method.

The servlet container must implement the URL handlers and URLConnection objects necessary to access the resource.

This method is different from java.lang.Class.getResourceAsStream, which uses a class loader. This method allows servlet containers to make a resource available to a servlet from any location, without using a class loader.

Parameters:
path - a String specifying the path to the resource
Returns:
the InputStream returned to the servlet, or null if no resource exists at the specified path

getRequestDispatcher

RequestDispatcher getRequestDispatcher(java.lang.String path)
Returns a RequestDispatcher object that acts as a wrapper for the resource located at the given path. A RequestDispatcher object can be used to forward a request to the resource or to include the resource in a response. The resource can be dynamic or static.

The pathname must begin with a / and is interpreted as relative to the current context root. Use getContext to obtain a RequestDispatcher for resources in foreign contexts.

This method returns null if the ServletContext cannot return a RequestDispatcher.

Parameters:
path - a String specifying the pathname to the resource
Returns:
a RequestDispatcher object that acts as a wrapper for the resource at the specified path, or null if the ServletContext cannot return a RequestDispatcher
See Also:
RequestDispatcher, ServletContext#getContext

getNamedDispatcher

RequestDispatcher getNamedDispatcher(java.lang.String name)
Returns a RequestDispatcher object that acts as a wrapper for the named servlet.

Servlets (and JSP pages also) may be given names via server administration or via a web application deployment descriptor. A servlet instance can determine its name using ServletConfig#getServletName.

This method returns null if the ServletContext cannot return a RequestDispatcher for any reason.

Parameters:
name - a String specifying the name of a servlet to wrap
Returns:
a RequestDispatcher object that acts as a wrapper for the named servlet, or null if the ServletContext cannot return a RequestDispatcher
See Also:
RequestDispatcher, ServletContext#getContext, ServletConfig#getServletName

getServlet

Servlet getServlet(java.lang.String name)
                   throws ServletException
Deprecated. As of Java Servlet API 2.1, with no direct replacement.

This method was originally defined to retrieve a servlet from a ServletContext. In this version, this method always returns null and remains only to preserve binary compatibility. This method will be permanently removed in a future version of the Java Servlet API.

In lieu of this method, servlets can share information using the ServletContext class and can perform shared business logic by invoking methods on common non-servlet classes.

Throws:
ServletException

getServlets

java.util.Enumeration<Servlet> getServlets()
Deprecated. As of Java Servlet API 2.0, with no replacement.

This method was originally defined to return an Enumeration of all the servlets known to this servlet context. In this version, this method always returns an empty enumeration and remains only to preserve binary compatibility. This method will be permanently removed in a future version of the Java Servlet API.

getServletNames

java.util.Enumeration<java.lang.String> getServletNames()
Deprecated. As of Java Servlet API 2.1, with no replacement.

This method was originally defined to return an Enumeration of all the servlet names known to this context. In this version, this method always returns an empty Enumeration and remains only to preserve binary compatibility. This method will be permanently removed in a future version of the Java Servlet API.

log

void log(java.lang.String msg)
Writes the specified message to a servlet log file, usually an event log. The name and type of the servlet log file is specific to the servlet container.

Parameters:
msg - a String specifying the message to be written to the log file

log

void log(java.lang.Exception exception,
         java.lang.String msg)
Deprecated. As of Java Servlet API 2.1, use log(String message, Throwable throwable) instead.

This method was originally defined to write an exception's stack trace and an explanatory error message to the servlet log file.

log

void log(java.lang.String message,
         java.lang.Throwable throwable)
Writes an explanatory message and a stack trace for a given Throwable exception to the servlet log file. The name and type of the servlet log file is specific to the servlet container, usually an event log.

Parameters:
message - a String that describes the error or exception
throwable - the Throwable error or exception

getRealPath

java.lang.String getRealPath(java.lang.String path)
Gets the real path corresponding to the given virtual path.

For example, if path is equal to /index.html, this method will return the absolute file path on the server's filesystem to which a request of the form http://<host>:<port>/<contextPath>/index.html would be mapped, where <contextPath> corresponds to the context path of this ServletContext.

The real path returned will be in a form appropriate to the computer and operating system on which the servlet container is running, including the proper path separators.

Resources inside the /META-INF/resources directories of JAR files bundled in the application's /WEB-INF/lib directory must be considered only if the container has unpacked them from their containing JAR file, in which case the path to the unpacked location must be returned.

This method returns null if the servlet container is unable to translate the given virtual path to a real path.

Parameters:
path - the virtual path to be translated to a real path
Returns:
the real path, or null if the translation cannot be performed

getServerInfo

java.lang.String getServerInfo()
Returns the name and version of the servlet container on which the servlet is running.

The form of the returned string is servername/versionnumber. For example, the JavaServer Web Development Kit may return the string JavaServer Web Dev Kit/1.0.

The servlet container may return other optional information after the primary string in parentheses, for example, JavaServer Web Dev Kit/1.0 (JDK 1.1.6; Windows NT 4.0 x86).

Returns:
a String containing at least the servlet container name and version number

getInitParameter

java.lang.String getInitParameter(java.lang.String name)
Returns a String containing the value of the named context-wide initialization parameter, or null if the parameter does not exist.

This method can make available configuration information useful to an entire web application. For example, it can provide a webmaster's email address or the name of a system that holds critical data.

Parameters:
name - a String containing the name of the parameter whose value is requested
Returns:
a String containing at least the servlet container name and version number
See Also:
ServletConfig#getInitParameter

getInitParameterNames

java.util.Enumeration<java.lang.String> getInitParameterNames()
Returns the names of the context's initialization parameters as an Enumeration of String objects, or an empty Enumeration if the context has no initialization parameters.

Returns:
an Enumeration of String objects containing the names of the context's initialization parameters
See Also:
ServletConfig#getInitParameter

setInitParameter

boolean setInitParameter(java.lang.String name,
                         java.lang.String value)
Sets the context initialization parameter with the given name and value on this ServletContext.

Parameters:
name - the name of the context initialization parameter to set
value - the value of the context initialization parameter to set
Returns:
true if the context initialization parameter with the given name and value was set successfully on this ServletContext, and false if it was not set because this ServletContext already contains a context initialization parameter with a matching name
Throws:
IllegalStateException - if this ServletContext has already been initialized
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
Since:
Servlet 3.0

getAttribute

java.lang.Object getAttribute(java.lang.String name)
Returns the servlet container attribute with the given name, or null if there is no attribute by that name.

An attribute allows a servlet container to give the servlet additional information not already provided by this interface. See your server documentation for information about its attributes. A list of supported attributes can be retrieved using getAttributeNames.

The attribute is returned as a java.lang.Object or some subclass.

Attribute names should follow the same convention as package names. The Java Servlet API specification reserves names matching java.*, javax.*, and sun.*.

Parameters:
name - a String specifying the name of the attribute
Returns:
an Object containing the value of the attribute, or null if no attribute exists matching the given name
See Also:
ServletContext#getAttributeNames

getAttributeNames

java.util.Enumeration<java.lang.String> getAttributeNames()
Returns an Enumeration containing the attribute names available within this ServletContext.

Use the getAttribute(java.lang.String) method with an attribute name to get the value of an attribute.

Returns:
an Enumeration of attribute names
See Also:
getAttribute(java.lang.String)

setAttribute

void setAttribute(java.lang.String name,
                  java.lang.Object object)
Binds an object to a given attribute name in this ServletContext. If the name specified is already used for an attribute, this method will replace the attribute with the new to the new attribute.

If listeners are configured on the ServletContext the container notifies them accordingly.

If a null value is passed, the effect is the same as calling removeAttribute().

Attribute names should follow the same convention as package names. The Java Servlet API specification reserves names matching java.*, javax.*, and sun.*.

Parameters:
name - a String specifying the name of the attribute
object - an Object representing the attribute to be bound

removeAttribute

void removeAttribute(java.lang.String name)
Removes the attribute with the given name from this ServletContext. After removal, subsequent calls to getAttribute(java.lang.String) to retrieve the attribute's value will return null.

If listeners are configured on the ServletContext the container notifies them accordingly.

Parameters:
name - a String specifying the name of the attribute to be removed

getServletContextName

java.lang.String getServletContextName()
Returns the name of this web application corresponding to this ServletContext as specified in the deployment descriptor for this web application by the display-name element.

Returns:
The name of the web application or null if no name has been declared in the deployment descriptor.
Since:
Servlet 2.3

addServlet

ServletRegistration.Dynamic addServlet(java.lang.String servletName,
                                       java.lang.String className)
Adds the servlet with the given name and class name to this servlet context.

The registered servlet may be further configured via the returned ServletRegistration object.

The specified className will be loaded using the classloader associated with the application represented by this ServletContext.

If this ServletContext already contains a preliminary ServletRegistration for a servlet with the given servletName, it will be completed (by assigning the given className to it) and returned.

This method introspects the class with the given className for the ServletSecurity, MultipartConfig, javax.annotation.security.RunAs, and javax.annotation.security.DeclareRoles annotations. In addition, this method supports resource injection if the class with the given className represents a Managed Bean. See the Java EE platform and JSR 299 specifications for additional details about Managed Beans and resource injection.

Parameters:
servletName - the name of the servlet
className - the fully qualified class name of the servlet
Returns:
a ServletRegistration object that may be used to further configure the registered servlet, or null if this ServletContext already contains a complete ServletRegistration for a servlet with the given servletName
Throws:
IllegalStateException - if this ServletContext has already been initialized
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
Since:
Servlet 3.0

addServlet

ServletRegistration.Dynamic addServlet(java.lang.String servletName,
                                       Servlet servlet)
Registers the given servlet instance with this ServletContext under the given servletName.

The registered servlet may be further configured via the returned ServletRegistration object.

If this ServletContext already contains a preliminary ServletRegistration for a servlet with the given servletName, it will be completed (by assigning the class name of the given servlet instance to it) and returned.

Parameters:
servletName - the name of the servlet
servlet - the servlet instance to register
Returns:
a ServletRegistration object that may be used to further configure the given servlet, or null if this ServletContext already contains a complete ServletRegistration for a servlet with the given servletName or if the same servlet instance has already been registered with this or another ServletContext in the same container
Throws:
IllegalStateException - if this ServletContext has already been initialized
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
java.lang.IllegalArgumentException - if the given servlet instance implements SingleThreadModel
Since:
Servlet 3.0

addServlet

ServletRegistration.Dynamic addServlet(java.lang.String servletName,
                                       java.lang.Class<? extends Servlet> servletClass)
Adds the servlet with the given name and class type to this servlet context.

The registered servlet may be further configured via the returned ServletRegistration object.

If this ServletContext already contains a preliminary ServletRegistration for a servlet with the given servletName, it will be completed (by assigning the name of the given servletClass to it) and returned.

This method introspects the given servletClass for the ServletSecurity, MultipartConfig, javax.annotation.security.RunAs, and javax.annotation.security.DeclareRoles annotations. In addition, this method supports resource injection if the given servletClass represents a Managed Bean. See the Java EE platform and JSR 299 specifications for additional details about Managed Beans and resource injection.

Parameters:
servletName - the name of the servlet
servletClass - the class object from which the servlet will be instantiated
Returns:
a ServletRegistration object that may be used to further configure the registered servlet, or null if this ServletContext already contains a complete ServletRegistration for the given servletName
Throws:
IllegalStateException - if this ServletContext has already been initialized
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
Since:
Servlet 3.0

createServlet

<T extends Servlet> T createServlet(java.lang.Class<T> clazz)
                                throws ServletException
Instantiates the given Servlet class.

The returned Servlet instance may be further customized before it is registered with this ServletContext via a call to addServlet(String,Servlet).

The given Servlet class must define a zero argument constructor, which is used to instantiate it.

This method introspects the given clazz for the following annotations: ServletSecurity, MultipartConfig, javax.annotation.security.RunAs, and javax.annotation.security.DeclareRoles. In addition, this method supports resource injection if the given clazz represents a Managed Bean. See the Java EE platform and JSR 299 specifications for additional details about Managed Beans and resource injection.

Parameters:
clazz - the Servlet class to instantiate
Returns:
the new Servlet instance
Throws:
ServletException - if the given clazz fails to be instantiated
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
Since:
Servlet 3.0

getServletRegistration

ServletRegistration getServletRegistration(java.lang.String servletName)
Gets the ServletRegistration corresponding to the servlet with the given servletName.

Returns:
the (complete or preliminary) ServletRegistration for the servlet with the given servletName, or null if no ServletRegistration exists under that name
Throws:
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
Since:
Servlet 3.0

getServletRegistrations

java.util.Map<java.lang.String,? extends ServletRegistration> getServletRegistrations()
Gets a (possibly empty) Map of the ServletRegistration objects (keyed by servlet name) corresponding to all servlets registered with this ServletContext.

The returned Map includes the ServletRegistration objects corresponding to all declared and annotated servlets, as well as the ServletRegistration objects corresponding to all servlets that have been added via one of the addServlet methods.

Any changes to the returned Map must not affect this ServletContext.

Returns:
Map of the (complete and preliminary) ServletRegistration objects corresponding to all servlets currently registered with this ServletContext
Throws:
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
Since:
Servlet 3.0

addFilter

FilterRegistration.Dynamic addFilter(java.lang.String filterName,
                                     java.lang.String className)
Adds the filter with the given name and class name to this servlet context.

The registered filter may be further configured via the returned FilterRegistration object.

The specified className will be loaded using the classloader associated with the application represented by this ServletContext.

If this ServletContext already contains a preliminary FilterRegistration for a filter with the given filterName, it will be completed (by assigning the given className to it) and returned.

This method supports resource injection if the class with the given className represents a Managed Bean. See the Java EE platform and JSR 299 specifications for additional details about Managed Beans and resource injection.

Parameters:
filterName - the name of the filter
className - the fully qualified class name of the filter
Returns:
a FilterRegistration object that may be used to further configure the registered filter, or null if this ServletContext already contains a complete FilterRegistration for a filter with the given filterName
Throws:
IllegalStateException - if this ServletContext has already been initialized
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
Since:
Servlet 3.0

addFilter

FilterRegistration.Dynamic addFilter(java.lang.String filterName,
                                     Filter filter)
Registers the given filter instance with this ServletContext under the given filterName.

The registered filter may be further configured via the returned FilterRegistration object.

If this ServletContext already contains a preliminary FilterRegistration for a filter with the given filterName, it will be completed (by assigning the class name of the given filter instance to it) and returned.

Parameters:
filterName - the name of the filter
filter - the filter instance to register
Returns:
a FilterRegistration object that may be used to further configure the given filter, or null if this ServletContext already contains a complete FilterRegistration for a filter with the given filterName or if the same filter instance has already been registered with this or another ServletContext in the same container
Throws:
IllegalStateException - if this ServletContext has already been initialized
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
Since:
Servlet 3.0

addFilter

FilterRegistration.Dynamic addFilter(java.lang.String filterName,
                                     java.lang.Class<? extends Filter> filterClass)
Adds the filter with the given name and class type to this servlet context.

The registered filter may be further configured via the returned FilterRegistration object.

If this ServletContext already contains a preliminary FilterRegistration for a filter with the given filterName, it will be completed (by assigning the name of the given filterClass to it) and returned.

This method supports resource injection if the given filterClass represents a Managed Bean. See the Java EE platform and JSR 299 specifications for additional details about Managed Beans and resource injection.

Parameters:
filterName - the name of the filter
filterClass - the class object from which the filter will be instantiated
Returns:
a FilterRegistration object that may be used to further configure the registered filter, or null if this ServletContext already contains a complete FilterRegistration for a filter with the given filterName
Throws:
IllegalStateException - if this ServletContext has already been initialized
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
Since:
Servlet 3.0

createFilter

<T extends Filter> T createFilter(java.lang.Class<T> clazz)
                              throws ServletException
Instantiates the given Filter class.

The returned Filter instance may be further customized before it is registered with this ServletContext via a call to addFilter(String,Filter).

The given Filter class must define a zero argument constructor, which is used to instantiate it.

This method supports resource injection if the given clazz represents a Managed Bean. See the Java EE platform and JSR 299 specifications for additional details about Managed Beans and resource injection.

Parameters:
clazz - the Filter class to instantiate
Returns:
the new Filter instance
Throws:
ServletException - if the given clazz fails to be instantiated
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
Since:
Servlet 3.0

getFilterRegistration

FilterRegistration getFilterRegistration(java.lang.String filterName)
Gets the FilterRegistration corresponding to the filter with the given filterName.

Returns:
the (complete or preliminary) FilterRegistration for the filter with the given filterName, or null if no FilterRegistration exists under that name
Throws:
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
Since:
Servlet 3.0

getFilterRegistrations

java.util.Map<java.lang.String,? extends FilterRegistration> getFilterRegistrations()
Gets a (possibly empty) Map of the FilterRegistration objects (keyed by filter name) corresponding to all filters registered with this ServletContext.

The returned Map includes the FilterRegistration objects corresponding to all declared and annotated filters, as well as the FilterRegistration objects corresponding to all filters that have been added via one of the addFilter methods.

Any changes to the returned Map must not affect this ServletContext.

Returns:
Map of the (complete and preliminary) FilterRegistration objects corresponding to all filters currently registered with this ServletContext
Throws:
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
Since:
Servlet 3.0

getSessionCookieConfig

SessionCookieConfig getSessionCookieConfig()
Gets the SessionCookieConfig object through which various properties of the session tracking cookies created on behalf of this ServletContext may be configured.

Repeated invocations of this method will return the same SessionCookieConfig instance.

Returns:
the SessionCookieConfig object through which various properties of the session tracking cookies created on behalf of this ServletContext may be configured
Throws:
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
Since:
Servlet 3.0

setSessionTrackingModes

void setSessionTrackingModes(java.util.Set<SessionTrackingMode> sessionTrackingModes)
Sets the session tracking modes that are to become effective for this ServletContext.

The given sessionTrackingModes replaces any session tracking modes set by a previous invocation of this method on this ServletContext.

Parameters:
sessionTrackingModes - the set of session tracking modes to become effective for this ServletContext
Throws:
IllegalStateException - if this ServletContext has already been initialized
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
java.lang.IllegalArgumentException - if sessionTrackingModes specifies a combination of SessionTrackingMode.SSL with a session tracking mode other than SessionTrackingMode.SSL, or if sessionTrackingModes specifies a session tracking mode that is not supported by the servlet container
Since:
Servlet 3.0

getDefaultSessionTrackingModes

java.util.Set<SessionTrackingMode> getDefaultSessionTrackingModes()
Gets the session tracking modes that are supported by default for this ServletContext.

Returns:
set of the session tracking modes supported by default for this ServletContext
Throws:
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
Since:
Servlet 3.0

getEffectiveSessionTrackingModes

java.util.Set<SessionTrackingMode> getEffectiveSessionTrackingModes()
Gets the session tracking modes that are in effect for this ServletContext.

The session tracking modes in effect are those provided to setSessionTrackingModes.

By default, the session tracking modes returned by getDefaultSessionTrackingModes are in effect.

Returns:
set of the session tracking modes in effect for this ServletContext
Throws:
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
Since:
Servlet 3.0

addListener

void addListener(java.lang.String className)
Adds the listener with the given class name to this ServletContext.

The class with the given name will be loaded using the classloader associated with the application represented by this ServletContext, and must implement one or more of the following interfaces:

If this ServletContext was passed to ServletContainerInitializer#onStartup, then the class with the given name may also implement ServletContextListener, in addition to the interfaces listed above.

As part of this method call, the container must load the class with the specified class name to ensure that it implements one of the required interfaces.

If the class with the given name implements a listener interface whose invocation order corresponds to the declaration order (i.e., if it implements ServletRequestListener, ServletContextListener, or HttpSessionListener), then the new listener will be added to the end of the ordered list of listeners of that interface.

This method supports resource injection if the class with the given className represents a Managed Bean. See the Java EE platform and JSR 299 specifications for additional details about Managed Beans and resource injection.

Parameters:
className - the fully qualified class name of the listener
Throws:
java.lang.IllegalArgumentException - if the class with the given name does not implement any of the above interfaces, or if it implements ServletContextListener and this ServletContext was not passed to ServletContainerInitializer#onStartup
IllegalStateException - if this ServletContext has already been initialized
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
Since:
Servlet 3.0

addListener

<T extends java.util.EventListener> void addListener(T t)
Adds the given listener to this ServletContext.

The given listener must be an instance of one or more of the following interfaces:

If this ServletContext was passed to ServletContainerInitializer#onStartup, then the given listener may also be an instance of ServletContextListener, in addition to the interfaces listed above.

If the given listener is an instance of a listener interface whose invocation order corresponds to the declaration order (i.e., if it is an instance of ServletRequestListener, ServletContextListener, or HttpSessionListener), then the listener will be added to the end of the ordered list of listeners of that interface.

Parameters:
t - the listener to be added
Throws:
java.lang.IllegalArgumentException - if the given listener is not an instance of any of the above interfaces, or if it is an instance of ServletContextListener and this ServletContext was not passed to ServletContainerInitializer#onStartup
IllegalStateException - if this ServletContext has already been initialized
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
Since:
Servlet 3.0

addListener

void addListener(java.lang.Class<? extends java.util.EventListener> listenerClass)
Adds a listener of the given class type to this ServletContext.

The given listenerClass must implement one or more of the following interfaces:

If this ServletContext was passed to ServletContainerInitializer#onStartup, then the given listenerClass may also implement ServletContextListener, in addition to the interfaces listed above.

If the given listenerClass implements a listener interface whose invocation order corresponds to the declaration order (i.e., if it implements ServletRequestListener, ServletContextListener, or HttpSessionListener), then the new listener will be added to the end of the ordered list of listeners of that interface.

This method supports resource injection if the given listenerClass represents a Managed Bean. See the Java EE platform and JSR 299 specifications for additional details about Managed Beans and resource injection.

Parameters:
listenerClass - the listener class to be instantiated
Throws:
java.lang.IllegalArgumentException - if the given listenerClass does not implement any of the above interfaces, or if it implements ServletContextListener and this ServletContext was not passed to ServletContainerInitializer#onStartup
IllegalStateException - if this ServletContext has already been initialized
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
Since:
Servlet 3.0

createListener

<T extends java.util.EventListener> T createListener(java.lang.Class<T> clazz)
                                                 throws ServletException
Instantiates the given EventListener class.

The specified EventListener class must implement at least one of the ServletContextListener, ServletContextAttributeListener, ServletRequestListener, ServletRequestAttributeListener, HttpSessionListener, or HttpSessionAttributeListener interfaces.

The returned EventListener instance may be further customized before it is registered with this ServletContext via a call to addListener(EventListener).

The given EventListener class must define a zero argument constructor, which is used to instantiate it.

This method supports resource injection if the given clazz represents a Managed Bean. See the Java EE platform and JSR 299 specifications for additional details about Managed Beans and resource injection.

Parameters:
clazz - the EventListener class to instantiate
Returns:
the new EventListener instance
Throws:
ServletException - if the given clazz fails to be instantiated
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
java.lang.IllegalArgumentException - if the specified EventListener class does not implement any of the ServletContextListener, ServletContextAttributeListener, ServletRequestListener, ServletRequestAttributeListener, HttpSessionListener, or HttpSessionAttributeListener interfaces.
Since:
Servlet 3.0

getJspConfigDescriptor

JspConfigDescriptor getJspConfigDescriptor()
Gets the <jsp-config> related configuration that was aggregated from the web.xml and web-fragment.xml descriptor files of the web application represented by this ServletContext.

Returns:
the <jsp-config> related configuration that was aggregated from the web.xml and web-fragment.xml descriptor files of the web application represented by this ServletContext, or null if no such configuration exists
Throws:
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
Since:
Servlet 3.0
See Also:
JspConfigDescriptor

getClassLoader

java.lang.ClassLoader getClassLoader()
Gets the class loader of the web application represented by this ServletContext.

If a security manager exists, and the caller's class loader is not the same as, or an ancestor of the requested class loader, then the security manager's checkPermission method is called with a RuntimePermission("getClassLoader") permission to check whether access to the requested class loader should be granted.

Returns:
the class loader of the web application represented by this ServletContext
Throws:
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
SecurityException - if a security manager denies access to the requested class loader
Since:
Servlet 3.0

declareRoles

void declareRoles(java.lang.String... roleNames)
Declares role names that are tested using isUserInRole.

Roles that are implicitly declared as a result of their use within the setServletSecurity or setRunAsRole methods of the ServletRegistration interface need not be declared.

Parameters:
roleNames - the role names being declared
Throws:
java.lang.UnsupportedOperationException - if this ServletContext was passed to the ServletContextListener#contextInitialized method of a ServletContextListener that was neither declared in web.xml or web-fragment.xml, nor annotated with WebListener
java.lang.IllegalArgumentException - if any of the argument roleNames is null or the empty string
IllegalStateException - if the ServletContext has already been initialized
Since:
Servlet 3.0
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