NullPointerException при доступе к объекту Hibernate/JPA с использованием EntityManager

Я пытаюсь создать проект, содержащий объекты JPA, доступные через веб-службу. Я выбрал Hibernate как своего поставщика JPA.NullPointerException при доступе к объекту Hibernate/JPA с использованием EntityManager

У меня есть Project сущности и ProjectManager компонента, который содержит один get() метода, используемого для получения проекта ID 1.

Я настроил пул соединений (названный smartinvestPool) и ресурс JDBC (названный SmartInvest), который использует этот пул на Glassfish (payara) через свою страницу администратора (localhost: 4848).

Файл с файлом persistence.xml ссылается на этот источник данных.

Мой веб-сервис просто вызывает метод get()ProjectManager.

Однако при работе я получил следующее исключение:

[2016-10-16T00:25:14.837+0200] [Payara 4.1] [WARNING] [] [javax.enterprise.web] [tid: _ThreadID=29 _ThreadName=http-listener-1(4)] [timeMillis: 1476570314837] [levelValue: 900] [[ 
    StandardWrapperValve[fr.rguidoux.smartinvest.ws.server.config.WsApplicationConfig]: Servlet.service() for servlet fr.rguidoux.smartinvest.ws.server.config.WsApplicationConfig threw exception 
java.lang.NullPointerException 
    at org.hibernate.engine.transaction.internal.jta.JtaStatusHelper.getStatus(JtaStatusHelper.java:76) 
    at org.hibernate.engine.transaction.internal.jta.JtaStatusHelper.isActive(JtaStatusHelper.java:118) 
    at org.hibernate.engine.transaction.internal.jta.CMTTransaction.join(CMTTransaction.java:149) 
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.joinTransaction(AbstractEntityManagerImpl.java:1602) 
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.postInit(AbstractEntityManagerImpl.java:210) 
    at org.hibernate.jpa.internal.EntityManagerImpl.<init>(EntityManagerImpl.java:91) 
    at org.hibernate.jpa.internal.EntityManagerFactoryImpl.internalCreateEntityManager(EntityManagerFactoryImpl.java:345) 
    at org.hibernate.jpa.internal.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:338) 
    at com.sun.enterprise.container.common.impl.EntityManagerWrapper._getDelegate(EntityManagerWrapper.java:197) 
    at com.sun.enterprise.container.common.impl.EntityManagerWrapper.find(EntityManagerWrapper.java:341) 
    at fr.rguidoux.smartinvest.entities.crowdlending.ProjectManager.get(ProjectManager.java:14) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:498) 
    at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1081) 
    at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1153) 
    at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:4786) 
    at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:656) 
    at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:824) 
    at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:608) 
    at org.jboss.weld.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke(AbstractEJBRequestScopeActivationInterceptor.java:64) 
    at org.jboss.weld.ejb.SessionBeanInterceptor.aroundInvoke(SessionBeanInterceptor.java:52) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:498) 
    at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883) 
    at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:823) 
    at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:608) 
    at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doCall(SystemInterceptorProxy.java:163) 
    at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:140) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:498) 
    at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883) 
    at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:823) 
    at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:369) 
    at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:4758) 
    at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:4746) 
    at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:212) 
    at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:88) 
    at com.sun.proxy.$Proxy234.get(Unknown Source) 
    at fr.rguidoux.smartinvest.entities.crowdlending.__EJB31_Generated__ProjectManager__Intf____Bean__.get(Unknown Source) 
    at fr.rguidoux.smartinvest.ws.server.services.ProjectWs.get(ProjectWs.java:18) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:498) 
    at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81) 
    at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:144) 
    at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:161) 
    at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$TypeOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:205) 
    at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:99) 
    at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:389) 
    at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:347) 
    at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102) 
    at org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:326) 
    at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271) 
    at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267) 
    at org.glassfish.jersey.internal.Errors.process(Errors.java:315) 
    at org.glassfish.jersey.internal.Errors.process(Errors.java:297) 
    at org.glassfish.jersey.internal.Errors.process(Errors.java:267) 
    at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317) 
    at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305) 
    at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154) 
    at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:471) 
    at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:425) 
    at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:383) 
    at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:336) 
    at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:223) 
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160) 
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734) 
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673) 
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174) 
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:416) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:283) 
    at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459) 
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167) 
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:206) 
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180) 
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235) 
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:283) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:200) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:132) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:111) 
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77) 
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:536) 
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112) 
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117) 
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56) 
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137) 
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:591) 
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:571) 
    at java.lang.Thread.run(Thread.java:745) 
]]

Кроме того, когда сервер начинает я получил следующее исключение:

java.lang.NullPointerException 
    at org.hibernate.engine.transaction.internal.jta.JtaStatusHelper.getStatus(JtaStatusHelper.java:76) 
    at org.hibernate.engine.transaction.internal.jta.JtaStatusHelper.isActive(JtaStatusHelper.java:118) 
    at org.hibernate.engine.transaction.internal.jta.CMTTransaction.join(CMTTransaction.java:149) 
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.joinTransaction(AbstractEntityManagerImpl.java:1602) 
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.postInit(AbstractEntityManagerImpl.java:210) 
    at org.hibernate.jpa.internal.EntityManagerImpl.<init>(EntityManagerImpl.java:91) 
    at org.hibernate.jpa.internal.EntityManagerFactoryImpl.internalCreateEntityManager(EntityManagerFactoryImpl.java:345) 
    at org.hibernate.jpa.internal.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:313) 
    at org.glassfish.persistence.jpa.JPADeployer$2.visitPUD(JPADeployer.java:451) 
    at org.glassfish.persistence.jpa.JPADeployer$PersistenceUnitDescriptorIterator.iteratePUDs(JPADeployer.java:510) 
    at org.glassfish.persistence.jpa.JPADeployer.iterateInitializedPUsAtApplicationPrepare(JPADeployer.java:492) 
    at org.glassfish.persistence.jpa.JPADeployer.event(JPADeployer.java:398) 
    at org.glassfish.kernel.event.EventsImpl.send(EventsImpl.java:131) 
...

Что я делаю не так?

Вот код моего проекта:

Project.java

@Entity 
public class Project { 
    @Id 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    private Integer id; 

    @Column(name = "name") 
    private String name; 


    public Integer getId() { 
     return id; 
    } 

    public String getName() { 
     return name; 
    } 

    public void setName(String name) { 
     this.name = name; 
    } 
}

ProjectManager.java

@Stateless 
public class ProjectManager { 
    @PersistenceContext(unitName = "smartinvestPU") 
    private EntityManager em; 

    public Project get() { 
     if (em != null) { 
      return em.find(Project.class, 1); 
     } 
     return null; 
    } 
}

ProjectWs.java

@Path("/projects") 
public class ProjectWs { 
    @EJB 
    private ProjectManager projectManager; 


    @GET 
    public String get() { 
     Project project = projectManager.get(); 
     return "My project name: " + project.getName(); 
    } 
}

persistence.xml

<?xml version="1.0" encoding="UTF-8"?> 
<persistence version="2.0" 
      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_2_0.xsd"> 
    <persistence-unit name="smartinvestPU" transaction-type="JTA"> 
    <provider>org.hibernate.ejb.HibernatePersistence</provider> 
    <jta-data-source>SmartInvest</jta-data-source> 
    <properties /> 
    </persistence-unit> 
</persistence>

источник

2016-10-15 Romain Guidoux

Ну, я, наконец, нашел решение. В persistence.xml я изменил org.hibernate.ejb.HibernatePersistence провайдера org.hibernate.jpa.HibernatePersistenceProvider, и я добавил 2 свойства, в том числе тот, который определяет платформу JTA:

<properties> 
    <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect"/> 
    <property name="hibernate.transaction.jta.platform" value="org.hibernate.service.jta.platform.internal.SunOneJtaPlatform" /> 
</properties>

источник

2016-10-16 09:05:13

Спасибо, причину я нашел на StackOverflow Класс ** org.hibernate.ejb .HibernatePersistence ** не существует в файле ** hibernate-release-5.2.2.Final.zip **. Вот почему провайдер не может быть найден, потому что класс не может (в банках библиотеки проекта). Вместо этого я использовал класс ** org.hibernate.jpa.HibernatePersistenceProvider **, который можно найти в ** hibernate-core-5.2.2.Final.jar ** (который поставляется с ** hibernate-release-5.2. 2.Final.zip **), сменив поставщика на ** persistence.xml ** на ** provider> org.hibernate.jpa.HibernatePersistenceProvider **. –

NullPointerException при доступе к объекту Hibernate/JPA с использованием EntityManager

ответ

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