使用JPAKnowledgeService创建StatefulKnowledgeSession时发生java.lang.NullPointerException

我正在尝试使用我的Spring Boot应用程序获得JPAKnowledgeService。为此，我遵循了here的指示。使用JPAKnowledgeService创建StatefulKnowledgeSession时发生java.lang.NullPointerException

我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>

我还没有定义事务边界，我不得不excludehibernate-ja-2.0-api从drools-persistence-jpa使用2.1由Spring本身提供。

<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>

当打电话newStatefulKnowledgeSession这样的：

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

我也有一个样品回购重现这个错误，可以发现here。任何帮助是极大的赞赏。谢谢！

来源

2017-02-14 Hasan Can Saral

看起来LIK e您正在尝试通过反射（buildResultService，KnowledgeStoreServiceImpl.java:171）调用一个不存在的构造函数。 –

将JtaTransactionManager的日志置于DEBUG模式并查看是否发现某些内容。 –

原来是我遗失'jndi.properties'行'java.naming.factory.initial = bitronix.tm.jndi.BitronixInitialContextFactory'。 –

你需要使用jndi.properties文件在类路径的根指向Java的使用bitrnix为JNDI提供商等等它可以事务管理器绑定到JNDI所以当时的JtaTransactionManager可以看看它

创建新的文件：的src /主/资源/用以下内容jndi.properties：

来源

2017-02-14 12:55:12

看来你正在使用JTA事务，尝试用这个属性：

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

来源

2017-02-14 12:48:39 Gatusko

它没有帮助。事实证明，我遗漏了'jndi.properties'，其中包含一行'java.naming.factory.initial = bitronix.tm.jndi.BitronixInitialContextFactory'。 –

使用JPAKnowledgeService创建StatefulKnowledgeSession时发生java.lang.NullPointerException

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