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| To create a Session Attribute Listener, create a class which implements the [HttpSessionAttributeListener|http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/servlet/http/HttpSessionAttributeListener.html] interface. |
| To create a Session Attribute Listener, create a class which implements the [HttpSessionAttributeListener|http://java.sun.com/products/servlet/2.3/javadoc/javax/servlet/http/HttpSessionAttributeListener.html] interface. |
| At line 27 changed 1 line. |
| This method is called whenever a new session attribute is added with [HttpSession.setAttribute()|http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/servlet/http/HttpSession.html#setAttribute(java.lang.String,%20java.lang.Object)]. |
| This method is called whenever a new session attribute is added with [HttpSession.setAttribute()|http://java.sun.com/products/servlet/2.3/javadoc/javax/servlet/http/HttpSession.html#setAttribute(java.lang.String,%20java.lang.Object)]. |
| At line 33 changed 1 line. |
| This method is called whenever a session attribute is removed with [HttpSession.removeAttribute()|http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/servlet/http/HttpSession.html#removeAttribute(java.lang.String)]. |
| This method is called whenever a session attribute is removed with [HttpSession.removeAttribute()|http://java.sun.com/products/servlet/2.3/javadoc/javax/servlet/http/HttpSession.html#removeAttribute(java.lang.String)]. |
| At line 37 changed 1 line. |
| This method is called whenever an existing session attribute is replaced with a new value, using [HttpSession.setAttribute()|http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/servlet/http/HttpSession.html#setAttribute(java.lang.String,%20java.lang.Object)]. |
| This method is called whenever an existing session attribute is replaced with a new value, using [HttpSession.setAttribute()|http://java.sun.com/products/servlet/2.3/javadoc/javax/servlet/http/HttpSession.html#setAttribute(java.lang.String,%20java.lang.Object)]. |
| At line 39 changed 1 line. |
| ![HttpSession|http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/servlet/http/HttpSession.htm] |
| ![HttpSession|http://java.sun.com/products/servlet/2.3/javadoc/javax/servlet/http/HttpSession.htm] |
| At line 41 changed 1 line. |
| The session is passed to both of the above methods in the [HttpSessionBindingEvent|http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/servlet/http/HttpSessionBindingEvent.html] object. |
| The session is passed to both of the above methods in the [HttpSessionBindingEvent|http://java.sun.com/products/servlet/2.3/javadoc/javax/servlet/http/HttpSessionBindingEvent.html] object. |
| At line 51 changed 1 line. |
| The name and value of the changed attribute are passed in the [HttpSessionBindingEvent|http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/servlet/http/HttpSessionBindingEvent.html] object. |
| The name and value of the changed attribute are passed in the [HttpSessionBindingEvent|http://java.sun.com/products/servlet/2.3/javadoc/javax/servlet/http/HttpSessionBindingEvent.html] object. |
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| !Sample Output |
| This is some live output from the above example. The session shows as DeltaSessionFacade because this application is clustered. The logs below were used to detect a problem with session replication in a Tomcat cluster. |
| {{{ |
| [SessionAttr] Wed Dec 06 23:33:39 EST 2006 Attribute added, session org.apache.catalina.cluster.session.DeltaSessionFacade@3d8f1be9: name=Cassie |
| [SessionAttr] Wed Dec 06 23:33:39 EST 2006 Attribute replaced, session org.apache.catalina.cluster.session.DeltaSessionFacade@3d8f1be9: portalSetting=com.metawerx.portal.Settings@3302fc5 |
| [SessionAttr] Wed Dec 06 23:33:39 EST 2006 Attribute replaced, session org.apache.catalina.cluster.session.DeltaSessionFacade@3d8f1be9: javax.servlet.jsp.jstl.fmt.request.charset=ISO-8859-1 |
| }}} |
| At line 112 added 14 lines. |
| !Sample Output |
| This is some output from a real application that uses the above code. The session shows as DeltaSessionFacade because this application is clustered using [Tomcat] clustering (see the <[distributable|web.xml.Distributable]> tag). The logs below were used to detect a problem with session replication, and verify that session attributes were really being replicated across to the other members of the cluster. |
| {{{ |
| [SessionAttr] Wed Dec 06 23:33:39 EST 2006 Attribute added, session org.apache.catalina.cluster.session.DeltaSessionFacade@3d8f1be9: name=Cassie |
| [SessionAttr] Wed Dec 06 23:33:39 EST 2006 Attribute replaced, session org.apache.catalina.cluster.session.DeltaSessionFacade@3d8f1be9: marketSettings=portal.market.Settings@3302fc5 |
| [SessionAttr] Wed Dec 06 23:33:39 EST 2006 Attribute replaced, session org.apache.catalina.cluster.session.DeltaSessionFacade@3d8f1be9: javax.servlet.jsp.jstl.fmt.request.charset=ISO-8859-1 |
| }}} |
| This is what showed when the session expired, as [Tomcat] cleaned up the variables by removing them all from the session: |
| {{{ |
| [SessionAttr] Thu Dec 07 00:22:45 EST 2006 Attribute removed, session org.apache.catalina.cluster.session.DeltaSessionFacade@3d8f1be9: name |
| [SessionAttr] Thu Dec 07 00:22:45 EST 2006 Attribute removed, session org.apache.catalina.cluster.session.DeltaSessionFacade@3d8f1be9: marketSettings |
| [SessionAttr] Thu Dec 07 00:22:45 EST 2006 Attribute removed, session org.apache.catalina.cluster.session.DeltaSessionFacade@3d8f1be9: javax.servlet.jsp.jstl.fmt.request.charset |
| }}} |
