java - Session is closed while creating Criteria -


the following code throws sessionexception @ line creates criteria object:

public user getuserbyusername(string username) {         try {             criterion criterion = restrictions.eq("username", username);             criteria criteria = (criteria) getsession().createcriteria(user.class).add(criterion);              return (user) criteria.uniqueresult();         }         catch(nullpointerexception ex) {             return new user();         }     }

my getsession() method follows:

 public session getsession() {         if(session == null) {             session = hibernateutil.getsessionfactory().getcurrentsession();         }         return session;     }

i have injected hibernateutil bean class has getsession() method. following exception.

org.hibernate.sessionexception: session closed!     @ org.hibernate.internal.abstractsessionimpl.errorifclosed(abstractsessionimpl.java:129)     @ org.hibernate.internal.sessionimpl.createcriteria(sessionimpl.java:1554)     @ com.csu.library.mvc.dao.implementation.userdaoimpl.getuserbyusername(userdaoimpl.java:23)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:39)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:25)     @ java.lang.reflect.method.invoke(method.java:597)     @ org.springframework.aop.support.aoputils.invokejoinpointusingreflection(aoputils.java:317)     @ org.springframework.aop.framework.reflectivemethodinvocation.invokejoinpoint(reflectivemethodinvocation.java:183)     @ org.springframework.aop.framework.reflectivemethodinvocation.proceed(reflectivemethodinvocation.java:150)     @ org.springframework.transaction.interceptor.transactioninterceptor.invoke(transactioninterceptor.java:110)     @ org.springframework.aop.framework.reflectivemethodinvocation.proceed(reflectivemethodinvocation.java:172)     @ org.springframework.aop.framework.jdkdynamicaopproxy.invoke(jdkdynamicaopproxy.java:204)     @ com.sun.proxy.$proxy55.getuserbyusername(unknown source)     @ com.csu.library.mvc.service.impl.userserviceimpl.getuser(userserviceimpl.java:49)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:39)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:25)     @ java.lang.reflect.method.invoke(method.java:597)     @ org.springframework.aop.support.aoputils.invokejoinpointusingreflection(aoputils.java:317)     @ org.springframework.aop.framework.reflectivemethodinvocation.invokejoinpoint(reflectivemethodinvocation.java:183)     @ org.springframework.aop.framework.reflectivemethodinvocation.proceed(reflectivemethodinvocation.java:150)     @ org.springframework.transaction.interceptor.transactioninterceptor.invoke(transactioninterceptor.java:110)     @ org.springframework.aop.framework.reflectivemethodinvocation.proceed(reflectivemethodinvocation.java:172)     @ org.springframework.aop.framework.jdkdynamicaopproxy.invoke(jdkdynamicaopproxy.java:204)     @ com.sun.proxy.$proxy60.getuser(unknown source)     @ com.csu.library.mvc.controller.usercontroller.homepage(usercontroller.java:37)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:39)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:25)     @ java.lang.reflect.method.invoke(method.java:597)     @ org.springframework.web.method.support.invocablehandlermethod.invoke(invocablehandlermethod.java:219)     @ org.springframework.web.method.support.invocablehandlermethod.invokeforrequest(invocablehandlermethod.java:132)     @ org.springframework.web.servlet.mvc.method.annotation.servletinvocablehandlermethod.invokeandhandle(servletinvocablehandlermethod.java:104)     @ org.springframework.web.servlet.mvc.method.annotation.requestmappinghandleradapter.invokehandlemethod(requestmappinghandleradapter.java:745)     @ org.springframework.web.servlet.mvc.method.annotation.requestmappinghandleradapter.handleinternal(requestmappinghandleradapter.java:686)     @ org.springframework.web.servlet.mvc.method.abstracthandlermethodadapter.handle(abstracthandlermethodadapter.java:80)     @ org.springframework.web.servlet.dispatcherservlet.dodispatch(dispatcherservlet.java:925)     @ org.springframework.web.servlet.dispatcherservlet.doservice(dispatcherservlet.java:856)     @ org.springframework.web.servlet.frameworkservlet.processrequest(frameworkservlet.java:920)     @ org.springframework.web.servlet.frameworkservlet.dopost(frameworkservlet.java:827)     @ javax.servlet.http.httpservlet.service(httpservlet.java:647)     @ org.springframework.web.servlet.frameworkservlet.service(frameworkservlet.java:801)     @ javax.servlet.http.httpservlet.service(httpservlet.java:728)     @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:305)     @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:210)     @ org.apache.catalina.core.standardwrappervalve.invoke(standardwrappervalve.java:222)     @ org.apache.catalina.core.standardcontextvalve.invoke(standardcontextvalve.java:123)     @ org.apache.catalina.authenticator.authenticatorbase.invoke(authenticatorbase.java:472)     @ org.apache.catalina.core.standardhostvalve.invoke(standardhostvalve.java:171)     @ org.apache.catalina.valves.errorreportvalve.invoke(errorreportvalve.java:99)     @ org.apache.catalina.valves.accesslogvalve.invoke(accesslogvalve.java:947)     @ org.apache.catalina.core.standardenginevalve.invoke(standardenginevalve.java:118)     @ org.apache.catalina.connector.coyoteadapter.service(coyoteadapter.java:408)     @ org.apache.coyote.http11.abstracthttp11processor.process(abstracthttp11processor.java:1009)     @ org.apache.coyote.abstractprotocol$abstractconnectionhandler.process(abstractprotocol.java:589)     @ org.apache.tomcat.util.net.jioendpoint$socketprocessor.run(jioendpoint.java:312)     @ java.util.concurrent.threadpoolexecutor$worker.runtask(threadpoolexecutor.java:895)     @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:918)     @ java.lang.thread.run(thread.java:680)

your method of getting session rather weird. yo shoul duse sessionfactory, obtain session within transaction.

the session should not instance variable (assuming using singleton scope services).


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