The <Servers | JMX> menu uses JMX (Java Management Extensions) to show key information about Java and Apache Tomcat. You can use it to analyze the cause of failures.
Use this menu as follows.
Open the Console.
Enter the following command.
set-preference -name SUPPORT_JMX_MENU -value true
Refresh the web browser. The <Admin | Servers | JMX> menu appears.