createEntityManager拋出java.lang.NullPointerException在org.hibernate.engine.transaction.internal.jta.JtaStatusHelper.getStatus

我得到這個堆棧跟蹤，當我部署我的休眠應用createEntityManager拋出java.lang.NullPointerException在org.hibernate.engine.transaction.internal.jta.JtaStatusHelper.getStatus

java.lang.NullPointerException 
    at org.hibernate.engine.transaction.internal.jta.JtaStatusHelper.getStatus(JtaStatusHelper.java:72) [hibernate-core-4.0.0.Beta1.jar:4.0.0.Beta1] 
    at org.hibernate.engine.transaction.internal.jta.JtaStatusHelper.isActive(JtaStatusHelper.java:114) [hibernate-core-4.0.0.Beta1.jar:4.0.0.Beta1] 
    at org.hibernate.engine.transaction.internal.jta.CMTTransaction.join(CMTTransaction.java:149) [hibernate-core-4.0.0.Beta1.jar:4.0.0.Beta1] 
    at org.hibernate.ejb.AbstractEntityManagerImpl.joinTransaction(AbstractEntityManagerImpl.java:1197) [hibernate-entitymanager-4.0.0.Beta1.jar:4.0.0.Beta1] 
    at org.hibernate.ejb.AbstractEntityManagerImpl.postInit(AbstractEntityManagerImpl.java:170) [hibernate-entitymanager-4.0.0.Beta1.jar:4.0.0.Beta1] 
    at org.hibernate.ejb.EntityManagerImpl.<init>(EntityManagerImpl.java:90) [hibernate-entitymanager-4.0.0.Beta1.jar:4.0.0.Beta1] 
    at org.hibernate.ejb.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:112) [hibernate-entitymanager-4.0.0.Beta1.jar:4.0.0.Beta1] 
    at org.hibernate.ejb.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:107) [hibernate-entitymanager-4.0.0.Beta1.jar:4.0.0.Beta1] 
    at com.mycompany.myapp.common.persistence.HibernateUtil.<clinit>(HibernateUtil.java:53) [classes:] 
    at com.mycompany.myapp.common.businessobjects.ServerSettings.GetServerSettings(ServerSettings.java:247) [classes:] 
    at com.mycompany.myapp.common.servlet.SecurityFilter.init(SecurityFilter.java:55) [classes:] 
    at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:447) [jbossweb-7.0.0.CR4.jar:7.0.0.Final] 
    at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3245) [jbossweb-7.0.0.CR4.jar:7.0.0.Final] 
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:3836) [jbossweb-7.0.0.CR4.jar:7.0.0.Final] 
    at org.jboss.as.web.deployment.WebDeploymentService.start(WebDeploymentService.java:70) [jboss-as-web-7.0.0.Final.jar:7.0.0.Final] 
    at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1765) 
    at org.jboss.msc.service.ServiceControllerImpl$ClearTCCLTask.run(ServiceControllerImpl.java:2291) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [:1.6.0_26] 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [:1.6.0_26] 
    at java.lang.Thread.run(Thread.java:680) [:1.6.0_26]

它擊中NPE在我的HibernateUtil類中，第53行是創建一個EntityManager的行 - 它看起來像createEntityManager（）返回null。代碼看起來像

private static EntityManagerFactory entityManagerFactory = null; 
private static EntityManager entityManager = null; 

static { 
    try { 

     entityManagerFactory = Persistence.createEntityManagerFactory("primary"); 
     entityManager = entityManagerFactory.createEntityManager();

我的persistence.xml看起來像

<?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="primary"> <jta-data-source>java:jboss/datasources/MySqlDS</jta-data-source> 

    <properties> 
    <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/> 
    <property name="hibernate.ejb.interceptor.session_scoped" value="com.mycompany.myapp.common.persistence.BusinessObjectInterceptor"/> 
      </properties>

任何想法，爲什麼createEntityManager（）給NPE？

來源

2011-08-24 user619804

Stacktrace清楚地表明Hibernate無法加入JTA事務。而且，<jta-data-source>和Persistence.createEntityManagerFactory()的組合看起來很奇怪 - 支持JTA的EntityManager通常由應用服務器創建並通過JNDI從它獲得。

如果您確實想使用資源本地事務而不是JTA，則需要聲明<non-jta-data-source>。

來源

2011-08-24 20:39:21 axtavt

我很感激 - 你的建議讓我通過這個錯誤的工作。謝謝！ – user619804

這是如何在所有JBoss版本<= 6的情況下運行的？我們在這裏有相同的組合，因爲我們將它部署到JBoss 7.0.1，所以它失敗了。 –

似乎是Hibernate 4.0.0.Beta中的一個錯誤。在這裏提交了一個錯誤報告：https：//hibernate.onjira.com/browse/HHH-6522 –

如果您在使用Hibernate 4，並試圖建立一個手動EntityManagerFactory（或SessionFactory）聲明爲<jta-datasource>，有您必須對您persistence.xml稱爲hibernate.transaction.jta.platform設置屬性。對於使用JBoss上7

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

我發現這個酒店在Hibernate Docs

來源

2013-05-08 18:15:50

不錯！這爲我解決了同樣的錯誤。我也可以使用'JBossStandAloneJtaPlatform'實現。可能的值顯示在「直接已知子類：」下面：https：//docs.jboss.org/hibernate/orm/4.2/javadocs/org/hibernate/service/jta/platform/internal/AbstractJtaPlatform.html –

createEntityManager拋出java.lang.NullPointerException在org.hibernate.engine.transaction.internal.jta.JtaStatusHelper.getStatus

回答

相關問題