问题
I am trying to get JPAKnowledgeService work with my Spring Boot application. For this I have followed the instructions from here.
My persistence.xml:
<?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="org.jbpm.persistence.jpa" transaction-type="JTA">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<class>org.drools.persistence.info.SessionInfo</class>
<class>org.drools.persistence.info.WorkItemInfo</class>
<properties>
<property name="hibernate.connection.url" value="jdbc:mysql://localhost/databaseName"/>
<property name="hibernate.connection.autocommit" value="false" />
<property name="hibernate.jndi.class" value="bitronix.tm.jndi.BitronixInitialContextFactory"/>
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" />
<property name="hibernate.connection.username" value="username"/>
<property name="hibernate.connection.password" value="password"/>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5InnoDBDialect"/>
<property name="hibernate.max_fetch_depth" value="3"/>
<property name="hibernate.hbm2ddl.auto" value="update" />
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.transaction.manager_lookup_class" value="org.hibernate.transaction.BTMTransactionManagerLookup" />
</properties>
</persistence-unit>
</persistence>
I haven't defined transaction boundaries and I had to exclude hibernate-ja-2.0-api from drools-persistence-jpa to use 2.1 that is provided by Spring itself.
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-persistence-jpa</artifactId>
<version>6.5.0.Final</version>
<exclusions>
<exclusion>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.0-api</artifactId>
</exclusion>
</exclusions>
</dependency>
Upon calling newStatefulKnowledgeSession like this:
Environment env = KnowledgeBaseFactory.newEnvironment();
env.set( EnvironmentName.ENTITY_MANAGER_FACTORY, Persistence.createEntityManagerFactory( "org.jbpm.persistence.jpa" ) );
env.set( EnvironmentName.TRANSACTION_MANAGER, TransactionManagerServices.getTransactionManager() );
KieSession kSession = JPAKnowledgeService.newStatefulKnowledgeSession(kieBase, null, env);
I am getting the following error:
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'JPAKnowledgeServiceFactory' defined in class path resource [org/hasancansaral/jpaknowledgeservicesample/JPAKnowledgeServiceConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.kie.internal.runtime.StatefulKnowledgeSession]: Factory method 'JPAKnowledgeServiceFactory' threw exception; nested exception is java.lang.IllegalStateException: java.lang.reflect.InvocationTargetException
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:599) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1173) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1067) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866) ~[spring-context-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542) ~[spring-context-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.4.4.RELEASE.jar:1.4.4.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:762) [spring-boot-1.4.4.RELEASE.jar:1.4.4.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:372) [spring-boot-1.4.4.RELEASE.jar:1.4.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-1.4.4.RELEASE.jar:1.4.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1187) [spring-boot-1.4.4.RELEASE.jar:1.4.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1176) [spring-boot-1.4.4.RELEASE.jar:1.4.4.RELEASE]
at org.hasancansaral.jpaknowledgeservicesample.JPAKnowledgeServiceSample.main(JPAKnowledgeServiceSample.java:15) [classes/:na]
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.kie.internal.runtime.StatefulKnowledgeSession]: Factory method 'JPAKnowledgeServiceFactory' threw exception; nested exception is java.lang.IllegalStateException: java.lang.reflect.InvocationTargetException
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
... 18 common frames omitted
Caused by: java.lang.IllegalStateException: java.lang.reflect.InvocationTargetException
at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommandService(KnowledgeStoreServiceImpl.java:185) ~[drools-persistence-jpa-6.5.0.Final.jar:6.5.0.Final]
at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.newKieSession(KnowledgeStoreServiceImpl.java:70) ~[drools-persistence-jpa-6.5.0.Final.jar:6.5.0.Final]
at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.newKieSession(KnowledgeStoreServiceImpl.java:39) ~[drools-persistence-jpa-6.5.0.Final.jar:6.5.0.Final]
at org.kie.internal.persistence.jpa.JPAKnowledgeService.newStatefulKnowledgeSession(JPAKnowledgeService.java:121) ~[kie-internal-6.5.0.Final.jar:6.5.0.Final]
at org.hasancansaral.jpaknowledgeservicesample.JPAKnowledgeServiceConfiguration.JPAKnowledgeServiceFactory(JPAKnowledgeServiceConfiguration.java:43) ~[classes/:na]
at org.hasancansaral.jpaknowledgeservicesample.JPAKnowledgeServiceConfiguration$$EnhancerBySpringCGLIB$$a75599c4.CGLIB$JPAKnowledgeServiceFactory$0(<generated>) ~[classes/:na]
at org.hasancansaral.jpaknowledgeservicesample.JPAKnowledgeServiceConfiguration$$EnhancerBySpringCGLIB$$a75599c4$$FastClassBySpringCGLIB$$6a4558.invoke(<generated>) ~[classes/:na]
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:356) ~[spring-context-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.hasancansaral.jpaknowledgeservicesample.JPAKnowledgeServiceConfiguration$$EnhancerBySpringCGLIB$$a75599c4.JPAKnowledgeServiceFactory(<generated>) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_121]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_121]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_121]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_121]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
... 19 common frames omitted
Caused by: java.lang.reflect.InvocationTargetException: null
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_121]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_121]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_121]
at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_121]
at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommandService(KnowledgeStoreServiceImpl.java:171) ~[drools-persistence-jpa-6.5.0.Final.jar:6.5.0.Final]
... 33 common frames omitted
Caused by: java.lang.NullPointerException: null
at org.drools.persistence.jta.JtaTransactionManager.getStatus(JtaTransactionManager.java:273) ~[drools-persistence-jpa-6.5.0.Final.jar:6.5.0.Final]
at org.drools.persistence.jpa.AbstractPersistenceContextManager.getApplicationScopedEntityManager(AbstractPersistenceContextManager.java:78) ~[drools-persistence-jpa-6.5.0.Final.jar:6.5.0.Final]
at org.drools.persistence.jpa.JpaPersistenceContextManager.getApplicationScopedPersistenceContext(JpaPersistenceContextManager.java:55) ~[drools-persistence-jpa-6.5.0.Final.jar:6.5.0.Final]
at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:103) ~[drools-persistence-jpa-6.5.0.Final.jar:6.5.0.Final]
... 38 common frames omitted
I also have a sample repo to recreate this error that can be found here. Any help is greatly appreciated. Thanks!
回答1:
you need to use jndi.properties file in the root of your class path to point java to use bitrnix as JNDI provider so it can bind transaction manager into JNDI so then JtaTransactionManager can look it up
create new file: src/main/resources/jndi.properties with following content:
java.naming.factory.initial=bitronix.tm.jndi.BitronixInitialContextFactory
回答2:
It seems that you are using JTA transactions, try with this property:
<property name="hibernate.transaction.jta.platform" value="org.hibernate.service.jta.platform.internal.NoJtaPlatform" />
来源：https://stackoverflow.com/questions/42226422/java-lang-nullpointerexception-when-creating-a-statefulknowledgesession-with-jpa