java - Handling servlets exceptions -


i getting troubles handling exceptions in web servlet app. i've created errorhandler servlet, handles incoming exceptions , added entry in web.xml file : 

<servlet>     <servlet-name>errorhandler</servlet-name>     <servlet-class>servletpackage.errorhandler</servlet-class> </servlet> <servlet-mapping>     <servlet-name>errorhandler</servlet-name>     <url-pattern>/errorhandler</url-pattern> </servlet-mapping> <error-page>     <exception-type>java.lang.exception</exception-type>     <location>/errorhandler</location> </error-page>

the problem server not invoke errorhandler servlet @ all. glassfish throws exception in console , web browser refreshes servlet thrown exception (with no data due unhandled exception).

warning:   standardwrappervalve[sessionchecker]: servlet.service() servlet sessionchecker threw exception javax.servlet.servletexception: forced exception thrown     @ servletpackage.sessionchecker.processrequest(sessionchecker.java:158)     @ servletpackage.sessionchecker.dopost(sessionchecker.java:174)     @ javax.servlet.http.httpservlet.service(httpservlet.java:707)     @ javax.servlet.http.httpservlet.service(httpservlet.java:790)     @ org.apache.catalina.core.standardwrapper.service(standardwrapper.java:1682)     @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:344)     @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:214)    .    .    .

any suggestions?

if exception being thrown web server exception handler have declared in web.xml not ever going deal it.

the exception handler in web.xml handle request coming web server.


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