java - Null pointer exception while running Spring project -

i unable figure out reason nullpointer exception in spring project. sometime project works fine time throwing null pointer exception here full stacktrace.

org.apache.jasper.jasperexception: javax.servlet.servletexception: java.lang.nullpointerexception org.apache.jasper.servlet.jspservletwrapper.handlejspexception(jspservletwrapper.java:585) org.apache.jasper.servlet.jspservletwrapper.service(jspservletwrapper.java:455) org.apache.jasper.servlet.jspservlet.servicejspfile(jspservlet.java:390) org.apache.jasper.servlet.jspservlet.service(jspservlet.java:334) javax.servlet.http.httpservlet.service(httpservlet.java:728) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:322) org.springframework.security.web.access.intercept.filtersecurityinterceptor.invoke(filtersecurityinterceptor.java:116) org.springframework.security.web.access.intercept.filtersecurityinterceptor.dofilter(filtersecurityinterceptor.java:83) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.access.exceptiontranslationfilter.dofilter(exceptiontranslationfilter.java:113) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.session.sessionmanagementfilter.dofilter(sessionmanagementfilter.java:103) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.authentication.anonymousauthenticationfilter.dofilter(anonymousauthenticationfilter.java:113) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.servletapi.securitycontextholderawarerequestfilter.dofilter(securitycontextholderawarerequestfilter.java:54) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.savedrequest.requestcacheawarefilter.dofilter(requestcacheawarefilter.java:45) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.authentication.www.basicauthenticationfilter.dofilter(basicauthenticationfilter.java:150) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.authentication.abstractauthenticationprocessingfilter.dofilter(abstractauthenticationprocessingfilter.java:182) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.authentication.logout.logoutfilter.dofilter(logoutfilter.java:105) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.context.securitycontextpersistencefilter.dofilter(securitycontextpersistencefilter.java:87) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.filterchainproxy.dofilterinternal(filterchainproxy.java:184) org.springframework.security.web.filterchainproxy.dofilter(filterchainproxy.java:155) org.springframework.web.filter.delegatingfilterproxy.invokedelegate(delegatingfilterproxy.java:346) org.springframework.web.filter.delegatingfilterproxy.dofilter(delegatingfilterproxy.java:259)  root cause  javax.servlet.servletexception: java.lang.nullpointerexception org.apache.jsp.redirect_jsp._jspservice(index_jsp.java:72) org.apache.jasper.runtime.httpjspbase.service(httpjspbase.java:70) javax.servlet.http.httpservlet.service(httpservlet.java:728) org.apache.jasper.servlet.jspservletwrapper.service(jspservletwrapper.java:432) org.apache.jasper.servlet.jspservlet.servicejspfile(jspservlet.java:390) org.apache.jasper.servlet.jspservlet.service(jspservlet.java:334) javax.servlet.http.httpservlet.service(httpservlet.java:728) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:322) org.springframework.security.web.access.intercept.filtersecurityinterceptor.invoke(filtersecurityinterceptor.java:116) org.springframework.security.web.access.intercept.filtersecurityinterceptor.dofilter(filtersecurityinterceptor.java:83) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.access.exceptiontranslationfilter.dofilter(exceptiontranslationfilter.java:113) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.session.sessionmanagementfilter.dofilter(sessionmanagementfilter.java:103) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.authentication.anonymousauthenticationfilter.dofilter(anonymousauthenticationfilter.java:113) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.servletapi.securitycontextholderawarerequestfilter.dofilter(securitycontextholderawarerequestfilter.java:54) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.savedrequest.requestcacheawarefilter.dofilter(requestcacheawarefilter.java:45) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.authentication.www.basicauthenticationfilter.dofilter(basicauthenticationfilter.java:150) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.authentication.abstractauthenticationprocessingfilter.dofilter(abstractauthenticationprocessingfilter.java:182) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.authentication.logout.logoutfilter.dofilter(logoutfilter.java:105) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.context.securitycontextpersistencefilter.dofilter(securitycontextpersistencefilter.java:87) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.filterchainproxy.dofilterinternal(filterchainproxy.java:184) org.springframework.security.web.filterchainproxy.dofilter(filterchainproxy.java:155) org.springframework.web.filter.delegatingfilterproxy.invokedelegate(delegatingfilterproxy.java:346) org.springframework.web.filter.delegatingfilterproxy.dofilter(delegatingfilterproxy.java:259)  root cause   java.lang.nullpointerexception org.apache.catalina.session.managerbase.generatesessionid(managerbase.java:807) org.apache.catalina.session.managerbase.createsession(managerbase.java:653) org.apache.catalina.connector.request.dogetsession(request.java:2892) org.apache.catalina.connector.request.getsession(request.java:2315) org.apache.catalina.connector.requestfacade.getsession(requestfacade.java:898) org.apache.catalina.connector.requestfacade.getsession(requestfacade.java:910) javax.servlet.http.httpservletrequestwrapper.getsession(httpservletrequestwrapper.java:238) javax.servlet.http.httpservletrequestwrapper.getsession(httpservletrequestwrapper.java:238) org.apache.jasper.runtime.pagecontextimpl._initialize(pagecontextimpl.java:146) org.apache.jasper.runtime.pagecontextimpl.initialize(pagecontextimpl.java:125) org.apache.jasper.runtime.jspfactoryimpl.internalgetpagecontext(jspfactoryimpl.java:112) org.apache.jasper.runtime.jspfactoryimpl.getpagecontext(jspfactoryimpl.java:65) org.apache.jsp.redirect_jsp._jspservice(redirect_jsp.java:53) org.apache.jasper.runtime.httpjspbase.service(httpjspbase.java:70) javax.servlet.http.httpservlet.service(httpservlet.java:728) org.apache.jasper.servlet.jspservletwrapper.service(jspservletwrapper.java:432) org.apache.jasper.servlet.jspservlet.servicejspfile(jspservlet.java:390) org.apache.jasper.servlet.jspservlet.service(jspservlet.java:334) javax.servlet.http.httpservlet.service(httpservlet.java:728) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:322) org.springframework.security.web.access.intercept.filtersecurityinterceptor.invoke(filtersecurityinterceptor.java:116) org.springframework.security.web.access.intercept.filtersecurityinterceptor.dofilter(filtersecurityinterceptor.java:83) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.access.exceptiontranslationfilter.dofilter(exceptiontranslationfilter.java:113) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.session.sessionmanagementfilter.dofilter(sessionmanagementfilter.java:103) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.authentication.anonymousauthenticationfilter.dofilter(anonymousauthenticationfilter.java:113) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.servletapi.securitycontextholderawarerequestfilter.dofilter(securitycontextholderawarerequestfilter.java:54) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.savedrequest.requestcacheawarefilter.dofilter(requestcacheawarefilter.java:45) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.authentication.www.basicauthenticationfilter.dofilter(basicauthenticationfilter.java:150) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.authentication.abstractauthenticationprocessingfilter.dofilter(abstractauthenticationprocessingfilter.java:182) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.authentication.logout.logoutfilter.dofilter(logoutfilter.java:105) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.context.securitycontextpersistencefilter.dofilter(securitycontextpersistencefilter.java:87) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:334) org.springframework.security.web.filterchainproxy.dofilterinternal(filterchainproxy.java:184) org.springframework.security.web.filterchainproxy.dofilter(filterchainproxy.java:155) org.springframework.web.filter.delegatingfilterproxy.invokedelegate(delegatingfilterproxy.java:346) org.springframework.web.filter.delegatingfilterproxy.dofilter(delegatingfilterproxy.java:259) 

i getting permgenspace error often. related this? changed project , tomcat vm option (using netbean ide) to:

-xx:maxpermsize=512m 

i using netbeans ide 7.3.1 , apache tomcat 7.0.37, spring 3.1.1, hibernate 3.

its showing delegatingfilterproxy in exception. may because of security setting.

    <?xml version="1.0" encoding="utf-8"?> <beans xmlns="http://www.springframework.org/schema/beans"    xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"    xmlns:security="http://www.springframework.org/schema/security"    xsi:schemalocation="http://www.springframework.org/schema/beans     http://www.springframework.org/schema/beans/spring-beans-3.1.xsd    http://www.springframework.org/schema/security     http://www.springframework.org/schema/security/spring-security-3.1.xsd">  <!-- configure spring-security  --> <security:http auto-config="true" use-expressions="true" access-denied-page="/auth/denied" >     <security:intercept-url pattern="/admin/**" access="hasrole('role_admin')"/>     <security:intercept-url pattern="/auth/**" access="hasrole('role_user')"/>     <security:form-login         login-page="/index"         authentication-failure-url="/index"         default-target-url="/welcome"         />     <security:logout         invalidate-session="true"         logout-success-url="/index" /> </security:http>   <!-- custom service spring retrieve users , corresponding access levels  --> <bean id="loginservice" class="com.tcs.ignite.ih.spring.service.loginservice"/>  <!--a service spring redirect proper view after successfull login--> <!--<bean id="loginsuccesshandler" class="com.tcs.ignite.ih.spring.controller.loginsuccesshandler" />-->  <!-- declare authentication-manager use custom userdetailsservice --> <security:authentication-manager>     <security:authentication-provider user-service-ref="loginservice">     </security:authentication-provider> </security:authentication-manager>  </beans> 

update :

when trying access index file,welcome file application defined in web.xml, following url

localhost:8080/xxxx/index 

i recieve following on browser:

http status 500 - not requestdispatcher [/web-inf/jsp/index.jsp]: check corresponding file exists within web application archive! 

index.jsp in present in directory. need define mapping in spring security intercept url tag /index?

the root cause of problem null sessionidgenerator in tomcat managerbase.

a quick @ code : possible manager didn't start yet, or if stopped. guess here code using "already stopped" manager.

correct me if i'm wrong, guess have crash after undeploy/deploy of app (without restarting tomcat completely).

from invalid instance of managerbase comes ?

well, not easy say, guess comes threadlocal variable not cleaned-up when app undeployed. so, can check own code see if not misusing threadlocal variable (always clean threadlocal variables in finally block in request filters).

if don't find in own code:

inspect logs (and warnings) occurs when undeploy/deploy web-app, chances find "resource x cannot released".

regarding recurrent outofmemory error : can linked problem. indeed, if threadlocal variable aren't clean-up correctly when app undeployed/deployed memory leak , @ end can cause outofmemory.

i hope helps. (posting logs when app undeployed/deployed may interesting.)