| # Apache Tomcat 6.0 |

Links Docs Home Config Ref. Home Top Level Elements Server Service Executors Executor Connectors HTTP AJP Containers Context Engine Host Cluster Nested Components Listeners Global Resources Loader Manager Realm Resources Valve Cluster Elements Cluster Manager Channel Channel/Membership Channel/Sender Channel/Receiver Channel/Interceptor Valve Deployer ClusterListener Global Settings System properties | # Apache Tomcat Configuration Reference ## The LifeCycle Listener Component
Introduction
A Listener element defines a component that performs actions when specific events occur, usually Tomcat starting or Tomcat stopping. Listeners may be nested inside a Server, Engine, Host or Context. Some Listeners are only intended to be nested inside specific elements. These constraints are noted in the documentation below.
Attributes
> Common Attributes
> > All implementations of Listener support the following attributes:
> > Attribute | Description
> > --- | ---
> > `className` | Java class name of the implementation to use. This class must implement the `org.apache.catalina.LifecycleListener` interface.
> Standard Implementation
> > Unlike most Catalina components, there are several standard Listener implementations available. As a result, the `className` attribute MUST be used to select the implementation you wish to use. ### APR Lifecycle Listener (org.apache.catalina.core.AprLifecycleListener) The APR Lifecycle Listener checks for the presence of the APR/native library and loads the library if it is present. For more information see the APR/native guide. This listener must only be nested within Server elements. The following additional attributes are support by the APR Lifecycle Listener:
> > Attribute | Description
> > --- | ---
> > `SSLEngine` | Name of the SSLEngine to use. off: Do not use SSL, on: Use SSL but no specific ENGINE. The default value is on. This initializes the native SSL engine, which must be enabled in the APR/native connector by the use of the `SSLEnabled` attribute. See the Official OpenSSL website for more details on supported SSL hardware engines and manufacturers.
> ### Jasper Listener (org.apache.catalina.core.JasperListener) The Jasper Listener initialises the Jasper 2 JSP engine before any web applications that may use it are loaded. For more information on the Jasper 2 JSP engine see the Jasper How To. This listener must only be nested within Server elements. No additional attributes are support by the Jasper Listener . ### Server Lifecycle Listener (org.apache.catalina.mbeans.ServerLifecycleListener) The Server Lifecycle Listener initialises the MBeanServer for the MBeans that may be used to manager Tomcat via JMX. Without this listener, none of the Tomcat MBeans will be available. This listener must only be nested within Server elements. No additional attributes are support by the Server Lifecycle Listener. ### Global Resources Lifecycle Listener (org.apache.catalina.mbeans.GlobalResourcesLifecycleListener) The Global Resources Lifecycle Listener initialises the Global JNDI resources defined in server.xml as part of the Global Resources element. Without this listener, none of the Global Resources will be available. This listener must only be nested within Server elements. No additional attributes are support by the Global Resources Lifecycle Listener.
Nested Components
No element may be nested inside a Listener.
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