7:59 a.m.
Error creating org.drools.persistence.PersistenceContextManager in
org.drools.persistence.SingleSessionCommandService in a Spring environment
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Key: JBRULES-3067
URL: https://issues.jboss.org/browse/JBRULES-3067
Project: Drools
Issue Type: Bug
Security Level: Public (Everyone can see)
Environment: I observed the problem in Drools 5.2.0.M1 and 5.2.0.CR1. Spring
version is 2.5.6.
Reporter: Perit Bezek
Assignee: Mark Proctor
org.drools.persistence.SingleSessionCommandService throws a NullPointerException during
the application startup. As described in the environment section the application uses
Drools 5.2.0.CR1 and Spring 2.5.6. Drools configuration is created in a Spring xml file:
<drools:kbase id="knowledgeBase">
<drools:resources>
<drools:resource type="BPMN2" source="..." />
</drools:resources>
</drools:kbase>
<drools:ksession id="knowledgeSession" kbase="knowledgeBase"
type="stateful">
<drools:configuration>
<drools:jpa-persistence>
<drools:entity-manager-factory ref="entityManagerFactory" />
<drools:transaction-manager ref="transactionManager" />
</drools:jpa-persistence>
</drools:configuration>
</drools:ksession>
Releated EntityManagerFactory and TransactionManager declarations are as follows:
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="persistenceXmlLocation"
value="classpath:META-INF/persistence.xml" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"
/>
</property>
</bean>
<tx:jta-transaction-manager />
The related stack trace is as follows:
Caused by: java.lang.IllegalStateException: java.lang.reflect.InvocationTargetException
at
org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommanService(KnowledgeStoreServiceImpl.java:130)
at
org.drools.persistence.jpa.KnowledgeStoreServiceImpl.newStatefulKnowledgeSession(KnowledgeStoreServiceImpl.java:54)
at
org.drools.persistence.jpa.JPAKnowledgeService.newStatefulKnowledgeSession(JPAKnowledgeService.java:109)
at
org.drools.container.spring.beans.StatefulKnowledgeSessionBeanFactory.internalAfterPropertiesSet(StatefulKnowledgeSessionBeanFactory.java:82)
at
org.drools.container.spring.beans.AbstractKnowledgeSessionBeanFactory.afterPropertiesSet(AbstractKnowledgeSessionBeanFactory.java:108)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1369)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1335)
... 30 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:44)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:516)
at
org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommanService(KnowledgeStoreServiceImpl.java:116)
... 36 more
Caused by: java.lang.RuntimeException: Could not commit session
at
org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:136)
... 41 more
Caused by: java.lang.NullPointerException
at
org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:125)
The problem is also discussed in the forum in this thread:
http://community.jboss.org/message/595927#595927 The actual problem is caused by the line
232 in org.drools.persistence.SingleSessionCommandService:
if ( tm.getClass().getName().toLowerCase().contains( "jpa" ) ) {
Now, if Spring is configured to use a JpaTransactionManager there is no problem. However,
if a JtaTransactionManager is used, which I believe is the usual case, it is ignored and
no PersistenceContextManager is created which causes the NPE on line 125:
jpm.getApplicationScopedPersistenceContext().persist( this.sessionInfo );
To fix the problem I, currently, use a modified version of the
org.drools.container.spring.beans.StatefulKnowledgeSessionBeanFactory which creates an
org.drools.runtime.Environment as follows:
DroolsSpringTransactionManager dstm = new
DroolsSpringTransactionManager((AbstractPlatformTransactionManager)
jpaConfiguration.getPlatformTransactionManager());
Environment env = KnowledgeBaseFactory.newEnvironment();
env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, jpaConfiguration.getEntityManagerFactory());
env.set(EnvironmentName.TRANSACTION_MANAGER, dstm);
env.set(EnvironmentName.OBJECT_MARSHALLING_STRATEGIES, new ObjectMarshallingStrategy[] {
new
SerializablePlaceholderResolverStrategy(ClassObjectMarshallingStrategyAcceptor.DEFAULT)
});
DroolsSpringJpaManager dsjm = new DroolsSpringJpaManager(env);
env.set(EnvironmentName.PERSISTENCE_CONTEXT_MANAGER, dsjm);
This creates a PersistenceContextManager which uses the correct JtaTransactionManager.
This way I have no problems.
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