使用JPAKnowledgeService创建StatefulKnowledgeSession时出现java.lang.NullPointerException

时间：2017-02-14 12:37:59

标签： java spring hibernate jpa drools

我想让JPAKnowledgeService使用我的Spring Boot应用程序。为此，我遵循了here的说明。

我的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>

我还没有定义交易边界，我必须exclude hibernate-ja-2.0-api来drools-persistence-jpa使用由Spring自己提供的2.1。

<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>

这样调用newStatefulKnowledgeSession：

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);

我收到以下错误：

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

我还有一个样本仓库来重新创建可以找到here的错误。任何帮助是极大的赞赏。谢谢！

2 个答案:

答案 0 :(得分：3)

你需要在类路径的根目录中使用jndi.properties文件来指向java使用bitrnix作为JNDI提供者，这样它就可以将事务管理器绑定到JNDI中，以便JtaTransactionManager可以查找它

创建新文件：src / main / resources / jndi.properties，内容如下：

java.naming.factory.initial=bitronix.tm.jndi.BitronixInitialContextFactory

答案 1 :(得分：0)

您似乎正在使用JTA交易，请尝试使用此属性：

 <property name="hibernate.transaction.jta.platform" value="org.hibernate.service.jta.platform.internal.NoJtaPlatform" />
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