NullPointerException from EntityManagerImpl

Fri, 04 Mar 2011 15:59:42 -0800 

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>

My persistence.xml looks as follows:

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence";
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"; 
             version="1.0">
   <persistence-unit name="bookingDatabase">

<provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
      <class>org.springframework.webflow.samples.booking.User</class>
      <class>org.springframework.webflow.samples.booking.Booking</class>
      <class>org.springframework.webflow.samples.booking.Hotel</class>
      <properties>
<property name="openjpa.RuntimeUnenhancedClasses" value="supported"/> <property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema(ForeignKeys=true)"/> <property name="openjpa.MetaDataFactory" value="jpa(Types=org.springframework.webflow.samples.booking.User;org.springframework.webflow.samples.booking.Booking;org.springframework.webflow.samples.booking.Hotel)"/> 
      </properties>
   </persistence-unit>
</persistence>
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

Reply via email to