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java - Eclipselink找不到适合jdbc:mysql的驱动程序

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This question already has answers here:
The infamous java.sql.SQLException: No suitable driver found
                                
                                    （13个回答）
                                
                        
                                3年前关闭。
            
                    
错误

找不到适用于jdbc：mysql：// localhost：3306 / mazedb的驱动程序

完全错误

INFO: [EL Info]: 2012-01-03
23:27:35.522--ServerSession(11375975)--EclipseLink, version: Eclipse
Persistence Services - 2.3.0.v20110604-r9504

INFO: [EL Severe]: 2012-01-03
23:27:35.528--ServerSession(11375975)--Local Exception Stack:
Exception [EclipseLink-4002] (Eclipse Persistence Services -
2.3.0.v20110604-r9504): org.eclipse.persistence.exceptions.DatabaseException Internal
Exception: java.sql.SQLException: No suitable driver found for
jdbc:mysql://localhost:3306/mazedb Error Code: 0    at
org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:324)
    at
org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:319)
    at
org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:138)
    at
org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162)
    at
org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:582)
    at
org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:206)
    at
org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:472)
    at
org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getDatabaseSession(EntityManagerFactoryDelegate.java:188)
    at
org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:277)
    at
org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:290)
    at
org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:268)
    at
com.maze.service.AccountService.validateLogin(AccountService.java:18)
    at
com.maze.controller.AccountController.performLogin(AccountController.java:31)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)  at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)     at
com.sun.el.parser.AstValue.invoke(AstValue.java:234)    at
com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297)
    at
com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
    at
javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
    at
com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
    at javax.faces.component.UICommand.broadcast(UICommand.java:315)    at
javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
    at
javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
    at
com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)    at
com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)   at
org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1539)
    at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
    at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
    at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)   at
com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)
    at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)
    at
org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:330)
    at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
    at
com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:174)
    at
com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:828)
    at
com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:725)
    at
com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1019)
    at
com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)
    at
com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at
com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at
com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at
com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at
com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at
com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)     at
com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at
com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:662) Caused by:
java.sql.SQLException: No suitable driver found for
jdbc:mysql://localhost:3306/mazedb  at
java.sql.DriverManager.getConnection(DriverManager.java:602)    at
java.sql.DriverManager.getConnection(DriverManager.java:154)    at
org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:98)
    ... 51 more

WARNING: #{accountController.performLogin}:
javax.persistence.PersistenceException: Exception [EclipseLink-4002]
(Eclipse Persistence Services - 2.3.0.v20110604-r9504):
org.eclipse.persistence.exceptions.DatabaseException Internal
Exception: java.sql.SQLException: No suitable driver found for
jdbc:mysql://localhost:3306/mazedb Error Code: 0
javax.faces.FacesException: #{accountController.performLogin}:
javax.persistence.PersistenceException: Exception [EclipseLink-4002]
(Eclipse Persistence Services - 2.3.0.v20110604-r9504):
org.eclipse.persistence.exceptions.DatabaseException Internal
Exception: java.sql.SQLException: No suitable driver found for
jdbc:mysql://localhost:3306/mazedb Error Code: 0    at
com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:118)
    at javax.faces.component.UICommand.broadcast(UICommand.java:315)    at
javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
    at
javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
    at
com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)    at
com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)   at
org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1539)
    at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
    at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
    at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)   at
com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)
    at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)
    at
org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:330)
    at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
    at
com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:174)
    at
com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:828)
    at
com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:725)
    at
com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1019)
    at
com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)
    at
com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at
com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at
com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at
com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at
com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at
com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)     at
com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at
com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:662) Caused by:
javax.faces.el.EvaluationException:
javax.persistence.PersistenceException: Exception [EclipseLink-4002]
(Eclipse Persistence Services - 2.3.0.v20110604-r9504):
org.eclipse.persistence.exceptions.DatabaseException Internal
Exception: java.sql.SQLException: No suitable driver found for
jdbc:mysql://localhost:3306/mazedb Error Code: 0    at
javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)
    at
com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
    ... 32 more Caused by: javax.persistence.PersistenceException:
Exception [EclipseLink-4002] (Eclipse Persistence Services -
2.3.0.v20110604-r9504): org.eclipse.persistence.exceptions.DatabaseException Internal
Exception: java.sql.SQLException: No suitable driver found for
jdbc:mysql://localhost:3306/mazedb Error Code: 0    at
org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:501)
    at
org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getDatabaseSession(EntityManagerFactoryDelegate.java:188)
    at
org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:277)
    at
org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:290)
    at
org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:268)
    at
com.maze.service.AccountService.validateLogin(AccountService.java:18)
    at
com.maze.controller.AccountController.performLogin(AccountController.java:31)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)  at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)     at
com.sun.el.parser.AstValue.invoke(AstValue.java:234)    at
com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297)
    at
com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
    at
javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
    ... 33 more Caused by: Exception [EclipseLink-4002] (Eclipse
Persistence Services - 2.3.0.v20110604-r9504):
org.eclipse.persistence.exceptions.DatabaseException Internal
Exception: java.sql.SQLException: No suitable driver found for
jdbc:mysql://localhost:3306/mazedb Error Code: 0    at
org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:324)
    at
org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:319)
    at
org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:138)
    at
org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162)
    at
org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:582)
    at
org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:206)
    at
org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:472)
    ... 47 more Caused by: java.sql.SQLException: No suitable driver
found for jdbc:mysql://localhost:3306/mazedb    at
java.sql.DriverManager.getConnection(DriverManager.java:602)    at
java.sql.DriverManager.getConnection(DriverManager.java:154)    at
org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:98)
    ... 51 more

INFO: Exit : invoke_application 5 WARNING: StandardWrapperValve[Faces
Servlet]: PWC1406: Servlet.service() for servlet Faces Servlet threw
exception javax.faces.el.EvaluationException:
javax.persistence.PersistenceException: Exception [EclipseLink-4002]
(Eclipse Persistence Services - 2.3.0.v20110604-r9504):
org.eclipse.persistence.exceptions.DatabaseException Internal
Exception: java.sql.SQLException: No suitable driver found for
jdbc:mysql://localhost:3306/mazedb Error Code: 0    at
javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)
    at
com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
    at javax.faces.component.UICommand.broadcast(UICommand.java:315)    at
javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
    at
javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
    at
com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)    at
com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)   at
org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1539)
    at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
    at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
    at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)   at
com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)
    at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)
    at
org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:330)
    at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
    at
com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:174)
    at
com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:828)
    at
com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:725)
    at
com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1019)
    at
com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)
    at
com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at
com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at
com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at
com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at
com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at
com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)     at
com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at
com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:662) Caused by:
javax.persistence.PersistenceException: Exception [EclipseLink-4002]
(Eclipse Persistence Services - 2.3.0.v20110604-r9504):
org.eclipse.persistence.exceptions.DatabaseException Internal
Exception: java.sql.SQLException: No suitable driver found for
jdbc:mysql://localhost:3306/mazedb Error Code: 0    at
org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:501)
    at
org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getDatabaseSession(EntityManagerFactoryDelegate.java:188)
    at
org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:277)
    at
org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:290)
    at
org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:268)
    at
com.maze.service.AccountService.validateLogin(AccountService.java:18)
    at
com.maze.controller.AccountController.performLogin(AccountController.java:31)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)  at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)     at
com.sun.el.parser.AstValue.invoke(AstValue.java:234)    at
com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297)
    at
com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
    at
javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
    ... 33 more Caused by: Exception [EclipseLink-4002] (Eclipse
Persistence Services - 2.3.0.v20110604-r9504):
org.eclipse.persistence.exceptions.DatabaseException Internal
Exception: java.sql.SQLException: No suitable driver found for
jdbc:mysql://localhost:3306/mazedb Error Code: 0    at
org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:324)
    at
org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:319)
    at
org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:138)
    at
org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162)
    at
org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:582)
    at
org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:206)
    at
org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:472)
    ... 47 more Caused by: java.sql.SQLException: No suitable driver
found for jdbc:mysql://localhost:3306/mazedb    at
java.sql.DriverManager.getConnection(DriverManager.java:602)    at
java.sql.DriverManager.getConnection(DriverManager.java:154)    at
org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:98)
    ... 51 more


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="Maze" transaction-type="RESOURCE_LOCAL">
        <properties>
            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/mazedb"/>
            <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
            <property name="javax.persistence.jdbc.user" value="maze"/>
            <property name="javax.persistence.jdbc.password" value="maze"/>
        </properties>

    </persistence-unit>
</persistence>


mysql连接器包含在构建路径中

最佳答案

找不到适用于jdbc：mysql：// localhost：3306 / mazedb的驱动程序


此异常基本上有2个可能的原因。


JDBC URL错误（基本上，到目前为止，所有已加载的JDBC驱动程序的Driver#acceptsURL()返回了false）。
JDBC驱动程序根本不会加载（因此在运行时类路径中缺少它，或者JDBC驱动程序类名称中有错字）。


到目前为止，JDBC URL和驱动程序类名称看起来正确。因此，驱动程序根本不在运行时类路径中。




  mysql连接器包含在构建路径中


JDBC驱动程序需要存在于webapp的运行时类路径中。如果是本地持久性单元，则需要将JDBC驱动程序JAR文件放在/WEB-INF/lib文件夹中。

此异常表明情况并非如此。将JAR文件放置在某个随机位置，然后在未在Deployment Assembly中指定文件的情况下将其手动添加到Build Path会导致此异常。这个不对。只需将JAR文件放在/WEB-INF/lib文件夹中，这样Eclipse将执行所有必要的操作来正确设置各项内容，而无需触摸项目属性中的任何内容。



与具体问题无关，请考虑容器管理的事务（将事务类型设置为JTA而不是本地资源）。它将大大减少EJB中用于管理事务的样板代码。您只需要创建一个容器管理的JNDI数据源，然后将JDBC驱动程序放在服务器的/lib中即可。

10-01 03:36
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