Spring Jboss：在查找实体管理器时抛出NullPointerExcsion

Question

我正在尝试配置spring框架JPA

try {
            /**
             * intentionally breaking code into two for testing
             * */
            AbstractJpaEntity entity = null;
            /**
             * below line of code throws exception
             * 1) Type, id & em, none of them found null at run-time
             * */
            if(em.find(type, id)!=null){
                entity = em.find(type, id);
            }
            return entity;
        } catch (NoResultException nre) {
            throw new WalletException("no entity found", nre);
        }

因此，每当执行上述代码时，em.find（type，id）抛出空指针异常。我尝试调试，发现id和类型具有预期的定义值，甚至em具有以下值：-

这表示xml中定义的持久化单元已正确加载，同样表示服务器启动日志。令人恼火的是，即使没有任何内容为null，但仍然会引发null指针异常。stacktrace如下所示：-

[org.apache.catalina.core.ContainerBase.[jboss.web]。[默认主机]。[/AltSurvey]。[rest]]（http--0.0.0.0-34567-2）Servlet。servlet rest的service（）引发异常：java。org上的lang.NullPointerException。冬眠发动机交易内部的jta。JtaStatusHelper。getStatus（JtaStatusHelper.java:73）[hibernate-core-4.0.1.Final.jar:4.0.1.Final]位于org。冬眠发动机交易内部的jta。JtaStatusHelper。isActive（JtaStatusHelper.java:115）[hibernate-core-4.0.1.Final.jar:4.0.1.Final]位于org。冬眠发动机交易内部的jta。CMT交易。在org上加入（CMTTransaction.java:149）[hibernate-core-4.0.1.Final.jar:4.0.1.Final]。冬眠ejb。AbstractEntityManagerImpl。joinTransaction（AbstractEntityManagerImpl.java:1207）[hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]位于org。冬眠ejb。AbstractEntityManagerImpl。postInit（AbstractEntityManagerImpl.java:176）[hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]位于org。冬眠ejb。EntityManagerImpl。（EntityManagerImpl.java:89）[hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]位于org。冬眠ejb。EntityManagerFactoryImpl。在org上创建entitymanager（EntityManagerFactoryImpl.java:125）[hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]。冬眠ejb。EntityManagerFactoryImpl。在sun上创建entitymanager（EntityManagerFactoryImpl.java:120）[hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]。反映NativeMethodAccessorImpl。在sun上调用0（本机方法）[rt.jar:1.7.0_67]。反映NativeMethodAccessorImpl。在sun上调用（NativeMethodAccessorImpl.java:57）[rt.jar:1.7.067]。反映DelegatingMethodAccessorImpl。在java上调用（DelegatingMethodAccessorImpl.java:43）[rt.jar:1.7.0_67]。朗。反思。方法在org上调用（Method.java:606）[rt.jar:1.7.0_67]。springframework。奥姆。jpa。AbstractEntityManagerFactoryBean。org上的invokeProxy方法（AbstractEntityManagerFactoryBean.java:376）[spring-orm-3.1.1.RELEASE.jar:3.1.1.RELEASE]。springframework。奥姆。jpa。AbstractEntityManagerFactoryBean$ManagedEntityManagerFactoryInvocationHandler。在com上调用（AbstractEntityManagerFactoryBean.java:517）[spring-orm-3.1.1.RELEASE.jar:3.1.1.RELEASE]。太阳代理$Proxy37。组织上的createEntityManager（未知源）。springframework。奥姆。jpa。SharedEntityManager创建者$SharedEntityManager职业处理者。在com上调用（SharedEntityManagerCreator.java:234）[spring-orm-3.1.1.RELEASE.jar:3.1.1.RELEASE]。太阳代理$Proxy47。在com上查找（未知源）。备选调查。常见的db。刀。杰帕多。findById（AbstractJpaDao.java:84）[类：]

我已经检查了与配置相关的所有XML。但无法怀疑出现异常的任何原因。我正在攻击下面的XML：-

persistence.xml

<persistence-unit name="TalentPactFormEngine_New"
        transaction-type="JTA">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <jta-data-source>java:/jdbc/TalentPactFormEngine_New</jta-data-source>
        <exclude-unlisted-classes>true</exclude-unlisted-classes>
        <shared-cache-mode>ENABLE_SELECTIVE</shared-cache-mode>
        <properties>
            <property name="hibernate.show_sql" value="true" />
            <property name="hibernate.format_sql" value="true" />
            <property name="hibernate.dialect" value="org.hibernate.dialect.SQLServerDialect" />
            <property name="hibernate.default_schema" value="dbo" />
            <property name="hibernate.generate_statistics" value="true" />
            <property name="hibernate.cache.use_second_level_cache"
                value="true" />
            <property name="hibernate.cache.use_query_cache" value="true" />
            <property name="hibernate.cache.infinispan.cachemanager"
                value="java:jboss/infinispan/hibernate" />
        </properties>
    </persistence-unit>

HibernatePaconfig。xml

<bean id="surveyDataSource" class="org.apache.commons.dbcp.BasicDataSource"
        scope="singleton" destroy-method="close">
        <property name="driverClassName" value="${driver}" />
        <property name="url" value="${url}" />
        <property name="username" value="${user}" />
        <property name="password" value="${password}" />
    </bean>

    <bean id="entityManagerFactory" depends-on="surveyDataSource"
        class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="dataSource" ref="surveyDataSource" />
        <property name="persistenceXmlLocation" value="classpath:persistence.xml" />
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" />
        </property>
    </bean>
    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory" />
    </bean>
    <tx:annotation-driven transaction-manager="transactionManager" />

应用程序上下文。xml

<bean id="dbDataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
        <!-- <property name="jndiName" value="java:/jdbc/TalentPactFormEngine_New" 
            /> -->
        <property name="environment" ref="remoteEnv" />
    </bean>

    <jee:jndi-lookup id="wcDataSource"
        jndi-name="java:/jdbc/TalentPactFormEngine_New" resource-ref="false"
        environment-ref="remoteEnv" expected-type="javax.sql.DataSource" />

    <util:properties id="remoteEnv">
        <prop key="java.naming.provider.url">http://survey.peoplestrong.com:34567
        </prop>
        <prop key="java.naming.factory.url.pkgs">org.jboss.naming:org.jnp.interfaces</prop>
        <prop key="java.naming.factory.initial">org.jnp.interfaces.NamingContextFactory</prop>
        <prop key="jnp.disableDiscovery">true</prop>
    </util:properties>

最后是独立的JBoss服务器

<datasource jta="true" jndi-name="java:/jdbc/TalentPactFormEngine_New" pool-name="TalentPactFormEngine_New" enabled="true" use-java-context="true" use-ccm="true">
                    <connection-url>jdbc:jtds:sqlserver://192.168.0.226:1433/talentpactformengine_new</connection-url>
                    <driver>net.sourceforge.jtds</driver>
                    <security>
                        <user-name>bla</user-name>
                        <password>blabla</password>
                    </security>
                </datasource>

无法找到NullPointer异常的原因，任何类型的帮助都将非常有用。

Answer 1

正如你在org.hibernate.engine.transaction.internal.jta.JtaStatusHelper的src代码中看到的

事务管理器必须为空

final int status = transactionManager.getStatus();

检查事务管理器的配置。