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From Rick Curtis <curti...@gmail.com>
Subject Re: NullPointerException from EntityManagerImpl
Date Sat, 05 Mar 2011 19:21:36 GMT
I'm not sure why spring is serializing EntityManagers... regardless this is
definitely a bug. I'm guessing you're in the tire kicking phase so if you
continue using OpenJPA you should read some info on Entity enhancement[1].
Using this property [2] in your persistence.xml is not recommend.

[1] http://openjpa.apache.org/entity-enhancement.html
[2] <property name="openjpa.RuntimeUnenhancedClasses" value="supported"/>

Thanks,
Rick

On Fri, Mar 4, 2011 at 5:11 PM, Jens Deppe <jdeppe@vmware.com> wrote:

> Hi,
>
> I'm trying to use OpenJPA 2.0.1 with the Spring WebFlow booking sample app
> and am having some trouble.
>
> I've set up my data access as follows:
>
>          <!-- Drives transactions using local JPA APIs -->
>          <bean id="transactionManager"
> class="org.springframework.orm.jpa.JpaTransactionManager">
>                  <property name="entityManagerFactory"
> ref="entityManagerFactory" />
>          </bean>
>
>          <!-- Creates a EntityManagerFactory for use with the OpenJPA
> provider and a simple in-memory data source populated with test data -->
>          <bean id="entityManagerFactory"
> class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
>                  <property name="dataSource" ref="dataSource" />
>                  <property name="jpaVendorAdapter">
>                          <bean
> class="org.springframework.orm.jpa.vendor.OpenJpaVendorAdapter" />
>                  </property>
>                  <property name="loadTimeWeaver">
>                      <bean
> class="org.springframework.instrument.classloading.ReflectiveLoadTimeWeaver"/>
>                  </property>
>          </bean>
>
> Everything seems to work fine until I hit a page which signals the start of
> a flow, at which point I get the following exception:
>
> java.lang.NullPointerException
>
>  org.apache.openjpa.persistence.EntityManagerImpl.readExternal(EntityManagerImpl.java:1441)
>
>  java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1791)
>
>  java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1750)
>        java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
>
>  java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1946)
>
>  java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1870)
>
>  java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
>        java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
>
>  java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1946)
>
>  java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1870)
>
>  java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
>        java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
>        java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
>
>  org.springframework.webflow.core.collection.LocalAttributeMap.readObject(LocalAttributeMap.java:342)
>        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)
>
>  java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
>
>  java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
>
>  java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
>        java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
>        java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
>
>  org.springframework.webflow.engine.impl.FlowSessionImpl.readExternal(FlowSessionImpl.java:147)
>
>  java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1791)
>
>  java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1750)
>        java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
>        java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
>        java.util.LinkedList.readObject(LinkedList.java:964)
>        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)
>
>  java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
>
>  java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
>
>  java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
>        java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
>        java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
>
>  org.springframework.webflow.engine.impl.FlowExecutionImpl.readExternal(FlowExecutionImpl.java:305)
>
>  java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1791)
>
>  java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1750)
>        java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
>        java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
>
>  org.springframework.webflow.execution.repository.snapshot.SerializedFlowExecutionSnapshot.deserialize(SerializedFlowExecutionSnapshot.java:194)
>
>  org.springframework.webflow.execution.repository.snapshot.SerializedFlowExecutionSnapshot.unmarshal(SerializedFlowExecutionSnapshot.java:99)
>
>  org.springframework.webflow.execution.repository.snapshot.SerializedFlowExecutionSnapshotFactory.restoreExecution(SerializedFlowExecutionSnapshotFactory.java:80)
>
>  org.springframework.webflow.execution.repository.snapshot.AbstractSnapshottingFlowExecutionRepository.restoreFlowExecution(AbstractSnapshottingFlowExecutionRepository.java:89)
>
>  org.springframework.webflow.execution.repository.impl.DefaultFlowExecutionRepository.getFlowExecution(DefaultFlowExecutionRepository.java:112)
>
>  org.springframework.webflow.executor.FlowExecutorImpl.resumeExecution(FlowExecutorImpl.java:168)
>
>  org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:183)
>
>  org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:788)
>
>  org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:717)
>
>  org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
>
>  org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
>        javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
>        javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
>
>  com.gemstone.gemfire.modules.session.filter.ServletWrapper.service(ServletWrapper.java:72)
>
>  org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:343)
>
>  org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:109)
>
>  org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)
>
>  org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
>
>  org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:97)
>
>  org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
>
>  org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:100)
>
>  org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
>
>  org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:78)
>
>  org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
>
>  org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)
>
>  org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
>
>  org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:35)
>
>  org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
>
>  org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:177)
>
>  org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
>
>  org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:188)
>
>  org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
>
>  org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)
>
>  org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
>
>  org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:79)
>
>  org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
>
>  org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:149)
>
>  org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
>
>  org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
>
>  org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
>
>  org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
>
>  com.gemstone.gemfire.modules.session.filter.SessionCachingFilter.doFilter(SessionCachingFilter.java:434)
>
>
> Doing some debugging, I can see that the factoryKey
> (EntityManagerImpl.java:1437) being deserialized is null. That's because it
> was written as null (line 1464):
>
> Object factoryKey = ((AbstractBrokerFactory) _broker
>                .getBrokerFactory()).getPoolKey();
>
> Here getPoolKey() returns null.
>
> So is this a bug, or should I be configuring something else/differently to
> get this to work?
>
> TIA.
>
> --Jens
>

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