JBoss AS 7 + Spring + JPA EntityManager空指針異常

我在此工作了一段時間。我想爲我的公共服務器使用OpenShift。所以我在本地也使用JBoss AS 7。我讀了很多論壇，一些類似的問題，但他們都沒有解決我的問題。我使用JPA，Spring 3，hibernate。我想我的springDispatcher-servlet.xml中有錯誤。JBoss AS 7 + Spring + JPA EntityManager空指針異常

這是什麼問題？在我使用EntityManager的DAO中，當我想對其使用查詢時，會得到nullpointerException。但是entityManager本身不是null。讓我告訴你，我有什麼。我springDispatcher-servlet.xml中

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean" > 
      <property name="persistenceUnitName" value="primary"/> 
    </bean> 

    <bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" /> 

    <context:component-scan base-package="com.company.db" /> 

    <tx:annotation-driven transaction-manager="transactionManager"/> 

<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager" 
     p:entityManagerFactory-ref="entityManagerFactory" />

的

部分我想使用的數據源是什麼讓我在JBoss中standalone.xml。所以我使用persistence.xml進行設置。這是在給定的persistenceUnitName來..- servlet.xml中

<persistence-unit name="primary" transaction-type="JTA"> 
    <jta-data-source>java:jboss/datasources/MysqlDS</jta-data-source> 
    <properties> 
     <!-- Properties for Hibernate --> 
     <property name="hibernate.hbm2ddl.auto" value="create-drop" /> 
     <property name="hibernate.show_sql" value="true" /> 
    </properties> 
</persistence-unit>

我有數據庫連接。由於上面的「創建 - 刪除」設置，它會在開始時創建註釋表。所以這很好。

的com.company.db包下的類是非常簡單的：

DAO接口：

public interface LocationDAO { 

    public List<Location> getList(); 

}

DAO實現：

@Repository("locationDAO") 
public class LocationDAOImpl implements LocationDAO { 

    @PersistenceContext 
    private EntityManager entityManager; 

    @SuppressWarnings("unchecked") 
    @Override 
    public List<Location> getList() { 
     List<Location> retVal = new ArrayList<Location>(); 

     Query query = entityManager.createQuery("select l from Location l"); 
     if (query != null) { 
      retVal = query.getResultList(); 
     } 

     return retVal; 
    } 

    public void setEntityManager(EntityManager entityManager) { 
     this.entityManager = entityManager; 
    }; 

}

這是問題所在。當從entityManager調用createQuery（entityManager不爲null）時。

我的交易界面：

public interface LocationDataService { 

    public List<Location> getLocations(); 

}

和實現：

@Service("locationDataService") 
@Transactional(propagation = Propagation.SUPPORTS, readOnly = true) 
public class LocationDataServiceImpl implements LocationDataService { 

    @Autowired 
    private LocationDAO locationDAO; 

    public LocationDataServiceImpl() { 
    } 

    @Override 
    public List<Location> getLocations() { 
     List<Location> retVal = new ArrayList<Location>(); 

     retVal = locationDAO.getList(); 

     return retVal; 
    } 

}

，我幾乎忘了位置類：

@Entity 
@Table(name = "location") 
public class Location { 

    @Id 
    @GeneratedValue 
    @Column(name = "id") 
    private Integer id; 

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

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

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

    public Location() { 

    } 

    public Location(Integer id, String country, String city, String postCode) { 
     this.id = id; 
     this.country = country; 
     this.city = city; 
     this.postCode = postCode; 
    } 



//getters, setters are here 
}

你有什麼建議，我有什麼錯過了配置？

這將是非常有幫助的，因爲我認爲在這一點上我只需要修改一下。

這是堆棧跟蹤：

14:10:16,924 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/].[springDispatcher]] (http-localhost-127.0.0.1-8080-1) Servlet.service() for servlet springDispatcher threw exception: java.lang.NullPointerException 
at org.hibernate.engine.transaction.internal.jta.JtaStatusHelper.getStatus(JtaStatusHelper.java:73) [hibernate-core-4.0.1.Final.jar:4.0.1.Final] 
at org.hibernate.engine.transaction.internal.jta.JtaStatusHelper.isActive(JtaStatusHelper.java:115) [hibernate-core-4.0.1.Final.jar:4.0.1.Final] 
at org.hibernate.engine.transaction.internal.jta.CMTTransaction.join(CMTTransaction.java:149) [hibernate-core-4.0.1.Final.jar:4.0.1.Final] 
at org.hibernate.ejb.AbstractEntityManagerImpl.joinTransaction(AbstractEntityManagerImpl.java:1207) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final] 
at org.hibernate.ejb.AbstractEntityManagerImpl.postInit(AbstractEntityManagerImpl.java:176) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final] 
at org.hibernate.ejb.EntityManagerImpl.<init>(EntityManagerImpl.java:89) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final] 
at org.hibernate.ejb.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:125) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final] 
at org.hibernate.ejb.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:120) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final] 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.6.0_31] 
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) [rt.jar:1.6.0_31] 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) [rt.jar:1.6.0_31] 
at java.lang.reflect.Method.invoke(Unknown Source) [rt.jar:1.6.0_31] 
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.invokeProxyMethod(AbstractEntityManagerFactoryBean.java:423) [spring-orm-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean$ManagedEntityManagerFactoryInvocationHandler.invoke(AbstractEntityManagerFactoryBean.java:485) [spring-orm-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at $Proxy38.createEntityManager(Unknown Source) at org.springframework.orm.jpa.EntityManagerFactoryUtils.doGetTransactionalEntityManager(EntityManagerFactoryUtils.java:195) [spring-orm-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:211) [spring-orm-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at $Proxy39.createQuery(Unknown Source) at com.company.db.dao.LocationDAOImpl.getList(LocationDAOImpl.java:31) [classes:] 
at com.company.db.service.LocationDataServiceImpl.getLocations(LocationDataServiceImpl.java:33) [classes:] 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.6.0_31] 
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) [rt.jar:1.6.0_31] 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) [rt.jar:1.6.0_31] 
at java.lang.reflect.Method.invoke(Unknown Source) [rt.jar:1.6.0_31] 
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309) [spring-aop-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183) [spring-aop-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150) [spring-aop-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110) [spring-tx-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) [spring-aop-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202) [spring-aop-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at $Proxy40.getLocations(Unknown Source) at com.company.something.SomethingSearchController.populateLocationList(SomethingSearchController.java:117) [classes:] 
at com.company.something.SomethingSearchController.initForm(SomethingSearchController.java:58) [classes:] 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.6.0_31] 
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) [rt.jar:1.6.0_31] 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) [rt.jar:1.6.0_31] 
at java.lang.reflect.Method.invoke(Unknown Source) [rt.jar:1.6.0_31] 
at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176) [spring-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426) [spring-webmvc-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414) [spring-webmvc-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790) [spring-webmvc-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719) [spring-webmvc-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644) [spring-webmvc-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549) [spring-webmvc-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:734) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final] 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final] 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329) [jbossweb-7.0.13.Final.jar:] 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:] 
at org.jboss.weld.servlet.ConversationPropagationFilter.doFilter(ConversationPropagationFilter.java:62) [weld-core-1.1.5.AS71.Final.jar:2012-02-10 15:31] 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.13.Final.jar:] 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:] 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:368) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:109) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:97) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:100) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:35) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:177) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:187) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:79) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:169) [spring-security-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237) [spring-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167) [spring-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.13.Final.jar:] 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:] 
at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:391) [urlrewritefilter-3.2.0.jar:3.2.0] 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.13.Final.jar:] 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:] 
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) [spring-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) [spring-web-3.0.5.RELEASE.jar:3.0.5.RELEASE] 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.13.Final.jar:] 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:] 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [jbossweb-7.0.13.Final.jar:] 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) [jbossweb-7.0.13.Final.jar:] 
at org.jboss.as.jpa.interceptor.WebNonTxEmCloserValve.invoke(WebNonTxEmCloserValve.java:50) [jboss-as-jpa-7.1.1.Final.jar:7.1.1.Final] 
at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153) [jboss-as-web-7.1.1.Final.jar:7.1.1.Final] 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155) [jbossweb-7.0.13.Final.jar:] 
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [jbossweb-7.0.13.Final.jar:] 
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [jbossweb-7.0.13.Final.jar:] 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368) [jbossweb-7.0.13.Final.jar:] 
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [jbossweb-7.0.13.Final.jar:] 
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671) [jbossweb-7.0.13.Final.jar:] 
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930) [jbossweb-7.0.13.Final.jar:] 
at java.lang.Thread.run(Unknown Source) [rt.jar:1.6.0_31]

來源

2012-05-18 gitarvandor

請將整個堆棧跟蹤添加到您的問題（可以匿名） –

好吧，我做到了。 – gitarvandor

問題解決了。

兩個XML文件，我不得不改變現在這個樣子：

springDispatcher-servlet.xml中的片段：

<context:component-scan base-package="com.company.db" /> 

<tx:annotation-driven /> 

    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> 
     <property name="persistenceUnitName" value="primary" /> 
    </bean> 

    <bean id="transactionManager" class="org.springframework.transaction.jta.JtaTransactionManager"> 
     <property name="transactionManagerName" value="java:/TransactionManager" /> 
    </bean>

的persistence.xml：

<?xml version="1.0" encoding="UTF-8"?> 
<persistence version="1.0" 
    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_1_0.xsd"> 
    <persistence-unit name="primary" transaction-type="JTA"> 
     <provider>org.hibernate.ejb.HibernatePersistence</provider> 
     <jta-data-source>java:jboss/datasources/MysqlDS</jta-data-source> 
     <class>com.company.db.Location</class> 

     <properties> 
      <property name="hibernate.transaction.manager_lookup_class" 
       value="org.hibernate.transaction.JBossTransactionManagerLookup" /> 
      <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" /> 
      <property name="hibernate.hbm2ddl.auto" value="create-drop" /> 
      <property name="hibernate.show_sql" value="true" /> 
      <property name="hibernate.format_sql" value="true" /> 
      <!-- Auto-detect entity classes --> 
      <property name="hibernate.archive.autodetection" value="class, hbm" /> 

     </properties> 
    </persistence-unit> 

</persistence>

這就是全部。現在我可以在Hibernate和JBoss AS 7中使用MySQL DB。

來源

2012-06-01 18:05:04 gitarvandor

我還必須添加 – Vedran

這就解決了我的問題，經過漫長的夜晚搜索幾十頁 – Solano

JBoss AS 7 + Spring + JPA EntityManager空指針異常

回答

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