Eclipselink找不到适合jdbc的驱动程序：mysql [重复]答案

【问题标题】：Eclipselink no suitable driver found for jdbc:mysql [duplicate]Eclipselink找不到适合jdbc的驱动程序：mysql [重复]
【发布时间】：2012-02-01 21:18:34
【问题描述】：

错误

没有找到适合 jdbc:mysql://localhost:3306/mazedb 的驱动

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

【问题讨论】：

标签： java jsf eclipselink

【解决方案1】：

没有找到适合 jdbc:mysql://localhost:3306/mazedb 的驱动

这个异常基本上有2个可能的原因。

JDBC URL 错误（基本上，Driver#acceptsURL() 已返回 false 用于目前已加载的所有 JDBC 驱动程序）。
根本没有加载 JDBC 驱动程序（因此它要么在运行时类路径中丢失，要么在 JDBC 驱动程序类名中有错字）。

到目前为止，JDBC URL 和驱动程序类名看起来是正确的。所以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。如果是本地持久化单元，则需要将 JDBC 驱动 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并手动将文件添加到 Build Path 而不在 Deployment Assembly 中指定它可能会导致此异常。这个不对。只需将 JAR 文件放到 /WEB-INF/lib 文件夹中，这样 Eclipse 将执行所有必要的魔法来设置正确的内容，而无需触及项目属性中的任何内容。

与具体问题无关，请考虑容器管理事务（将事务类型设置为 JTA 而不是资源本地）。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，并将 JDBC 驱动程序放在服务器的/lib 中即可。

【讨论】：

我在 Glassfish3 上创建了一个 ConnectionPoolDataSource，并将连接器放在 Glassfish 的库中。现在它似乎工作正常。这是正确的方法吗？如果我在另一个 Web 容器中运行我的应用程序，但知道该容器可能没有相同的设置，会发生什么？
您只需在另一个容器中配置具有相同 JNDI 名称的数据源（或使 JNDI 名称在外部可配置为环境变量）。它到底是哪种数据源并不重要，只要它支持连接池和 JTA 事务（所有 Java EE 6 容器都支持）。

【解决方案2】：

这是在服务器上运行的吗？你的项目中有mysql数据库驱动jar文件吗？

这是我的驱动程序设置在 Eclipse 中的样子。您通过数据库透视图进入此屏幕并添加一个新数据源。您包含驱动程序 jar 文件，以便它知道在哪里可以找到驱动程序。如果这是在服务器上，请将 jar 文件放在您的 lib 或 deploy 文件夹中，以便它可以找到驱动程序。

【讨论】：

我按照你的方法试过了，但它抛出了同样的错误：没有为 jdbc:mysql://localhost:3306/mazedb 找到合适的驱动程序