liliana.iovanovici [https://community.jboss.org/people/liliana.iovanovici] created the discussion "Re: NullPointerException when trying to configure jbpm5 with Spring 3.0 and Persistence" To view the discussion, visit: https://community.jboss.org/message/719388#719388 -------------------------------------------------------------- I was trying to configure persistence in other way, using Bitronix. My spring-conf.xml file is:           <bean id="transactionManager"                     class="org.springframework.transaction.jta.JtaTransactionManager">                     <property name="transactionManager" ref="bitronixTransactionManager" />                     <property name="userTransaction" ref="bitronixTransactionManager" />           </bean>           <bean id="bitronixTransactionManager" factory-method="getTransactionManager"                     class="bitronix.tm.TransactionManagerServices" depends-on="transactionManager"                     destroy-method="shutdown" />           <bean id="entityManagerFactory"                     class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">                     <property name="persistenceUnitName" value="oracle" />                     <property name="persistenceXmlLocation" value="classpath:META-INF/persistence.xml" />                     <property name="jpaVendorAdapter">                               <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">                                         <property name="databasePlatform" value="org.hibernate.dialect.Oracle10gDialect" />                                         <property name="showSql" value="true" />                                         <property name="generateDdl" value="false" />                               </bean>                     </property>           </bean>           <jbpm:kbase id="kbase">                     <jbpm:resources>                               <jbpm:resource type="BPMN2" source="classpath:Hi.bpmn" />                     </jbpm:resources>           </jbpm:kbase>           <jbpm:ksession id="persistentKSession" type="stateful"                     kbase="kbase">                     <jbpm:configuration>                               <jbpm:jpa-persistence>                                         <jbpm:transaction-manager ref="transactionManager" />                                         <jbpm:entity-manager-factory ref="entityManagerFactory" />                               </jbpm:jpa-persistence>                     </jbpm:configuration>           </jbpm:ksession> *And persistence.xml file is:* <persistence-unit name="oracle" transaction-type="JTA">     <provider>org.hibernate.ejb.HibernatePersistence</provider>     <jta-data-source></jta-data-source>     <mapping-file>META-INF/JBPMorm.xml</mapping-file>     <class>org.drools.persistence.info.SessionInfo</class>     <class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class>     <class>org.drools.persistence.info.WorkItemInfo</class>      <properties>       <property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect"/>       <property name="hibernate.connection.driver_class" value="oracle.jdbc.OracleDriver"/>       <property name="hibernate.connection.url" value="jdbc:oracle:thin:@localhost:1521:xe" />       <property name="hibernate.connection.username" value="apsfsample"/>       <property name="hibernate.connection.password" value="apsf"/>       <property name="hibernate.connection.autocommit" value="false" />       <property name="hibernate.max_fetch_depth" value="3"/>       <property name="hibernate.hbm2ddl.auto" value="create" />       <property name="hibernate.show_sql" value="true" />       <property name="hibernate.transaction.manager_lookup_class" value="org.hibernate.transaction.BTMTransactionManagerLookup"/>     </properties>   </persistence-unit> </persistence> I *steel* got an exeption. It seems that the session can be commited in database. The error is: 11:14:25,437 ERROR SingleSessionCommandService:313 - Could not commit session java.lang.NullPointerException           at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:125)           at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)           at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)           at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)           at java.lang.reflect.Constructor.newInstance(Constructor.java:513)           at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommanService(KnowledgeStoreServiceImpl.java:116)           at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.newStatefulKnowledgeSession(KnowledgeStoreServiceImpl.java:54)           at org.drools.persistence.jpa.JPAKnowledgeService.newStatefulKnowledgeSession(JPAKnowledgeService.java:122)           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:1460)           at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1400)           at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513)           at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:450)           at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:290)           at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)           at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:287)           at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:189)           at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:545)           at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:871)           at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:423)           at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)           at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83) Does anybody know this error? 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