Question

错误[ACTIVE] ExecuteThread：＆＃39; 33＆＃39; for queue：＆＃39; weblogic.kernel.Default（自我调整）＆＃39; - 07.02.2014 11：37：20,360 request_id = 9e32efa6-1374-4b1c-99e9-326a3a256b88 错误代码：99错误在异步任务中延迟0：

本地异常堆栈：异常[EclipseLink-4002]（Eclipse Persistence Services - 2.3.2.v20111125-r10461）：org.eclipse.persistence.exceptions.DatabaseException 内部异常：java.sql.SQLException：语句已被关闭错误代码：0 呼叫：SELECT ID，FIRST_NAME，ISBLOCKED，LAST_NAME，MODIFIED，MSISDN，VERSION，OWNER_ID，CONTACT_ID来自联系人（OWNER_ID =？） bind =＆gt; [1参数界限] 查询：ReadAllQuery（name =＆＃34; VasServerfile：/data/msgadmin/wls12c/wlserver_12.1/domains/VAS-MSG-TST-DMN/servers/VAS-MSG-TST-M1-MAN1-1/tmp/_WL_user /VasServer/c7nfil/war/WEB-INF/lib/_wl_cls_gen.jar_VasServerPU" referenceClass =联系sql =＆＃34; SELECT ID，FIRST_NAME，ISBLOCKED，LAST_NAME，MODIFIED，MSISDN，VERSION，OWNER_ID，CONTACT_ID from CONTACTS WHERE（ OWNER_ID =？）＆＃34;） at org.eclipse.persistence.exceptions.DatabaseException.sqlException（DatabaseException.java：333）在org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.basicExecuteCall（DatabaseAccessor.java:644）在org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeCall（DatabaseAccessor.java:535） at org.eclipse.persistence.internal.sessions.AbstractSession.basicExecuteCall（AbstractSession.java:1717）在org.eclipse.persistence.sessions.server.ClientSession.executeCall（ClientSession.java:253）在org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall（DatasourceCallQueryMechanism.java:207）在org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall（DatasourceCallQueryMechanism.java:193）在org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeSelectCall（DatasourceCallQueryMechanism.java:264）在org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.selectAllRows（DatasourceCallQueryMechanism.java:646） at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllRowsFromTable（ExpressionQueryMechanism.java:2611）在org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllRows（ExpressionQueryMechanism.java:2570）在org.eclipse.persistence.queries.ReadAllQuery.executeObjectLevelReadQuery（ReadAllQuery.java:420） at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery（ObjectLevelReadQuery.java:1081）在org.eclipse.persistence.queries.DatabaseQuery.execute（DatabaseQuery.java:844） at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute（ObjectLevelReadQuery.java:1040）在org.eclipse.persistence.queries.ReadAllQuery.execute（ReadAllQuery.java:392）

我正在尝试使用JPA多线程，但我采取了这种例外，任何解决问题的想法。

感谢

Answer 1

EntityManager不是线程安全的，因此您应该在单个线程中使用EntityManager实例。在不同的线程中，您可以使用EntityManagerFactory实例，因为它是线程安全的。

Answer 2

如果你想隔离不同的HTTP线程（我的意思是每个http线程都拥有它自己的entityManager），你有web应用程序就可以使用OpenEntityMangerInView过滤器。

web.xml 片段：

<filter>
    <filter-name>oemInViewFilter</filter-name>
    <filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>
    <init-param>
        <param-name>entityManagerFactoryBeanName</param-name>
        <param-value>entityManagerFactory</param-value>
    </init-param>
</filter>

您还可以尝试OpenEntityManagerInViewInterceptor：

http://javadox.com/org.springframework/spring-orm/3.2.6.RELEASE/org/springframework/orm/jpa/support/OpenEntityManagerInViewInterceptor.html

JPA作为多线程

2 个答案: