jpa - java.lang.NullPointerException at org.hibernate.ejb.criteria.predicate.ComparisonPredicate.render -

i have added predicate condition code, resolving column fine not sure why thowing error:

    error com.sl.web.controller.abstractcontroller logerror- exception occur in controller: null. java.lang.nullpointerexception     @ org.hibernate.ejb.criteria.predicate.comparisonpredicate.render(comparisonpredicate.java:178)     @ org.hibernate.ejb.criteria.predicate.compoundpredicate.render(compoundpredicate.java:133)     @ org.hibernate.ejb.criteria.predicate.compoundpredicate.render(compoundpredicate.java:128)     @ org.hibernate.ejb.criteria.querystructure.render(querystructure.java:258)     @ org.hibernate.ejb.criteria.criteriaqueryimpl.render(criteriaqueryimpl.java:340)     @ org.hibernate.ejb.criteria.criteriaquerycompiler.compile(criteriaquerycompiler.java:217)     @ org.hibernate.ejb.abstractentitymanagerimpl.createquery(abstractentitymanagerimpl.java:587)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:57)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:601)     @ org.springframework.orm.jpa.sharedentitymanagercreator$sharedentitymanagerinvocationhandler.invoke(sharedentitymanagercreator.java:240)     @ $proxy57.createquery(unknown source)     @ org.springframework.data.jpa.repository.support.simplejparepository.getquery(simplejparepository.java:443)     @ org.springframework.data.jpa.repository.support.simplejparepository.findall(simplejparepository.java:294)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:57)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:601)     @ org.springframework.data.repository.core.support.repositoryfactorysupport$queryexecutormethodinterceptor.executemethodon(repositoryfactorysupport.java:334)     @ org.springframework.data.repository.core.support.repositoryfactorysupport$queryexecutormethodinterceptor.invoke(repositoryfactorysupport.java:319)     @ org.springframework.aop.framework.reflectivemethodinvocation.proceed(reflectivemethodinvocation.java:172)     @ org.springframework.transaction.interceptor.transactioninterceptor.invoke(transactioninterceptor.java:110)     @ org.springframework.aop.framework.reflectivemethodinvocation.proceed(reflectivemethodinvocation.java:172)     @ org.springframework.dao.support.persistenceexceptiontranslationinterceptor.invoke(persistenceexceptiontranslationinterceptor.java:155)     @ org.springframework.aop.framework.reflectivemethodinvocation.proceed(reflectivemethodinvocation.java:172)     @ org.springframework.data.jpa.repository.support.lockmoderepositorypostprocessor$lockmodepopulatingmethodintercceptor.invoke(lockmoderepositorypostprocessor.java:84)     @ org.springframework.aop.framework.reflectivemethodinvocation.proceed(reflectivemethodinvocation.java:172)     @ org.springframework.aop.interceptor.exposeinvocationinterceptor.invoke(exposeinvocationinterceptor.java:90)     @ org.springframework.aop.framework.reflectivemethodinvocation.proceed(reflectivemethodinvocation.java:172)     @ org.springframework.aop.framework.jdkdynamicaopproxy.invoke(jdkdynamicaopproxy.java:202)     @ $proxy110.findall(unknown source)     @ com.smartlead.service.impl.dealermanageenrollmentsserviceimpl.finddealersenrollmentdataviewbycriteria(dealermanageenrollmentsserviceimpl.java:126)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:57)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:601)     @ org.springframework.aop.support.aoputils.invokejoinpointusingreflection(aoputils.java:319)     @ org.springframework.aop.framework.jdkdynamicaopproxy.invoke(jdkdynamicaopproxy.java:196)     @ $proxy127.finddealersenrollmentdataviewbycriteria(unknown source)     @ com.smartlead.web.controller.manageenrollmentscontroller.filterbystatus(manageenrollmentscontroller.java:306)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:57)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:601)     @ org.springframework.web.method.support.invocablehandlermethod.invoke(invocablehandlermethod.java:213)     @ org.springframework.web.method.support.invocablehandlermethod.invokeforrequest(invocablehandlermethod.java:126)     @ org.springframework.web.servlet.mvc.method.annotation.servletinvocablehandlermethod.invokeandhandle(servletinvocablehandlermethod.java:96)     @ org.springframework.web.servlet.mvc.method.annotation.requestmappinghandleradapter.invokehandlermethod(requestmappinghandleradapter.java:617)     @ org.springframework.web.servlet.mvc.method.annotation.requestmappinghandleradapter.handleinternal(requestmappinghandleradapter.java:578)     @ org.springframework.web.servlet.mvc.method.abstracthandlermethodadapter.handle(abstracthandlermethodadapter.java:80)     @ org.springframework.web.servlet.dispatcherservlet.dodispatch(dispatcherservlet.java:923)     @ org.springframework.web.servlet.dispatcherservlet.doservice(dispatcherservlet.java:852)     @ org.springframework.web.servlet.frameworkservlet.processrequest(frameworkservlet.java:882)     @ org.springframework.web.servlet.frameworkservlet.dopost(frameworkservlet.java:789)     @ javax.servlet.http.httpservlet.service(httpservlet.java:647)     @ 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)     @ net.bull.javamelody.monitoringfilter.dofilter(monitoringfilter.java:163)     @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:243)     @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:210)     @ net.bull.javamelody.monitoringfilter.dofilter(monitoringfilter.java:206)     @ net.bull.javamelody.monitoringfilter.dofilter(monitoringfilter.java:179)     @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:243)     @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:210)     @ com.smartlead.filter.crossscriptingfilter.dofilter(crossscriptingfilter.java:25)     @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:243)     @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:210)     @ com.smartlead.filter.datasessionfilter.dofilterinternal(datasessionfilter.java:42)     @ org.springframework.web.filter.onceperrequestfilter.dofilter(onceperrequestfilter.java:76)     @ org.springframework.web.filter.delegatingfilterproxy.invokedelegate(delegatingfilterproxy.java:346)     @ org.springframework.web.filter.delegatingfilterproxy.dofilter(delegatingfilterproxy.java:259)     @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:243)     @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:210)     @ org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:330)     @ org.springframework.security.web.access.intercept.filtersecurityinterceptor.invoke(filtersecurityinterceptor.java:118)     @ org.springframework.security.web.access.intercept.filtersecurityinterceptor.dofilter(filtersecurityinterceptor.java:84)     @ org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:342)     @ org.springframework.security.web.access.exceptiontranslationfilter.dofilter(exceptiontranslationfilter.java:113)     @ org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:342)     @ org.springframework.security.web.session.sessionmanagementfilter.dofilter(sessionmanagementfilter.java:103)     @ org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:342)     @ org.springframework.security.web.authentication.anonymousauthenticationfilter.dofilter(anonymousauthenticationfilter.java:113)     @ org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:342)     @ org.springframework.security.web.servletapi.securitycontextholderawarerequestfilter.dofilter(securitycontextholderawarerequestfilter.java:54)     @ org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:342)     @ org.springframework.security.web.savedrequest.requestcacheawarefilter.dofilter(requestcacheawarefilter.java:45)     @ org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:342)     @ org.springframework.security.web.authentication.www.basicauthenticationfilter.dofilter(basicauthenticationfilter.java:150)     @ org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:342)     @ org.springframework.security.web.authentication.abstractauthenticationprocessingfilter.dofilter(abstractauthenticationprocessingfilter.java:183)     @ org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:342)     @ org.springframework.security.web.authentication.logout.logoutfilter.dofilter(logoutfilter.java:105)     @ org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:342)     @ org.springframework.security.web.context.securitycontextpersistencefilter.dofilter(securitycontextpersistencefilter.java:87)     @ org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:342)     @ org.springframework.security.web.filterchainproxy.dofilterinternal(filterchainproxy.java:192)     @ org.springframework.security.web.filterchainproxy.dofilter(filterchainproxy.java:160)     @ org.springframework.web.filter.delegatingfilterproxy.invokedelegate(delegatingfilterproxy.java:346)     @ org.springframework.web.filter.delegatingfilterproxy.dofilter(delegatingfilterproxy.java:259)     @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:243)     @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:210)     @ org.springframework.orm.jpa.support.openentitymanagerinviewfilter.dofilterinternal(openentitymanagerinviewfilter.java:147)     @ org.springframework.web.filter.onceperrequestfilter.dofilter(onceperrequestfilter.java:76)     @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:243)     @ 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:936)     @ org.apache.catalina.core.standardenginevalve.invoke(standardenginevalve.java:118)     @ org.apache.catalina.connector.coyoteadapter.service(coyoteadapter.java:407)     @ org.apache.coyote.http11.abstracthttp11processor.process(abstracthttp11processor.java:1004)     @ org.apache.coyote.abstractprotocol$abstractconnectionhandler.process(abstractprotocol.java:589)     @ org.apache.tomcat.util.net.jioendpoint$socketprocessor.run(jioendpoint.java:312)     @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1110)     @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:603)     @ java.lang.thread.run(thread.java:722) 

here java code

predicatesor.add(cb.equal(root.<date> get("registrationdate"), null)); 

i want results registrationdate null.

testing expression null done via predicate returned criteriabuilder.isnull(expression).

instead of:

cb.equal(root.<date> get("registrationdate"), null) 

following should used:

cb.isnull(root.get("registrationdate"))