org.sqlite.JDBC 不能转换为 javax.sql.DataSource

【问题标题】：org.sqlite.JDBC cannot be cast to javax.sql.DataSourceorg.sqlite.JDBC 不能转换为 javax.sql.DataSource
【发布时间】：2014-10-13 10:17:31
【问题描述】：

我正在 Linux Mint 上使用 Netbeans 8.0.1 构建 Java Enterprise 应用程序。 我必须使用现有的 SQLite 数据库，所以我按照tutorial here 将 Netbeans 连接到它。 然后我写了一个试用 Entity 类和 Session Bean，但是 当我部署应用程序时出现以下错误：

Grave:   Exception while preparing the app : Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLException: Error in allocating a connection. Cause: org.sqlite.JDBC cannot be cast to javax.sql.DataSource
Error Code: 0
Local Exception Stack: 
Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLException: Error in allocating a connection. Cause: org.sqlite.JDBC cannot be cast to javax.sql.DataSource
Error Code: 0
    at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:316)
    at org.eclipse.persistence.sessions.JNDIConnector.connect(JNDIConnector.java:135)
    at org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.setOrDetectDatasource(DatabaseSessionImpl.java:203)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:734)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:239)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:681)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getAbstractSession(EntityManagerFactoryDelegate.java:204)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getDatabaseSession(EntityManagerFactoryDelegate.java:182)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.getDatabaseSession(EntityManagerFactoryImpl.java:527)
    at org.eclipse.persistence.jpa.PersistenceProvider.createContainerEntityManagerFactory(PersistenceProvider.java:358)
    at org.glassfish.persistence.jpa.PersistenceUnitLoader.loadPU(PersistenceUnitLoader.java:199)
    at org.glassfish.persistence.jpa.PersistenceUnitLoader.<init>(PersistenceUnitLoader.java:107)
    at org.glassfish.persistence.jpa.JPADeployer$1.visitPUD(JPADeployer.java:223)
    at org.glassfish.persistence.jpa.JPADeployer$PersistenceUnitDescriptorIterator.iteratePUDs(JPADeployer.java:510)
    at org.glassfish.persistence.jpa.JPADeployer.createEMFs(JPADeployer.java:230)
    at org.glassfish.persistence.jpa.JPADeployer.prepare(JPADeployer.java:168)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.prepareModule(ApplicationLifecycle.java:922)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:431)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:219)
    at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:491)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$2$1.run(CommandRunnerImpl.java:527)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$2$1.run(CommandRunnerImpl.java:523)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:356)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$2.execute(CommandRunnerImpl.java:522)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:546)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1423)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$1500(CommandRunnerImpl.java:108)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1762)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1674)
    at com.sun.enterprise.v3.admin.AdminAdapter.doCommand(AdminAdapter.java:534)
    at com.sun.enterprise.v3.admin.AdminAdapter.onMissingResource(AdminAdapter.java:224)
    at org.glassfish.grizzly.http.server.StaticHttpHandler.service(StaticHttpHandler.java:297)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:246)
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191)
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168)
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189)
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838)
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:564)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544)
    at java.lang.Thread.run(Thread.java:744)
Caused by: java.sql.SQLException: Error in allocating a connection. Cause: org.sqlite.JDBC cannot be cast to javax.sql.DataSource
    at com.sun.gjc.spi.base.AbstractDataSource.getConnection(AbstractDataSource.java:121)
    at org.eclipse.persistence.sessions.JNDIConnector.connect(JNDIConnector.java:123)
    ... 50 more
Caused by: javax.resource.spi.ResourceAllocationException: Error in allocating a connection. Cause: org.sqlite.JDBC cannot be cast to javax.sql.DataSource
    at com.sun.enterprise.connectors.ConnectionManagerImpl.internalGetConnection(ConnectionManagerImpl.java:319)
    at com.sun.enterprise.connectors.ConnectionManagerImpl.allocateConnection(ConnectionManagerImpl.java:196)
    at com.sun.enterprise.connectors.ConnectionManagerImpl.allocateConnection(ConnectionManagerImpl.java:171)
    at com.sun.enterprise.connectors.ConnectionManagerImpl.allocateConnection(ConnectionManagerImpl.java:166)
    at com.sun.gjc.spi.base.AbstractDataSource.getConnection(AbstractDataSource.java:114)
    ... 51 more
Caused by: com.sun.appserv.connectors.internal.api.PoolingException: org.sqlite.JDBC cannot be cast to javax.sql.DataSource
    at com.sun.enterprise.resource.pool.datastructure.RWLockDataStructure.addResource(RWLockDataStructure.java:103)
    at com.sun.enterprise.resource.pool.ConnectionPool.addResource(ConnectionPool.java:282)
    at com.sun.enterprise.resource.pool.ConnectionPool.createResourceAndAddToPool(ConnectionPool.java:1512)
    at com.sun.enterprise.resource.pool.ConnectionPool.createResources(ConnectionPool.java:944)
    at com.sun.enterprise.resource.pool.ConnectionPool.initPool(ConnectionPool.java:230)
    at com.sun.enterprise.resource.pool.ConnectionPool.internalGetResource(ConnectionPool.java:511)
    at com.sun.enterprise.resource.pool.ConnectionPool.getResource(ConnectionPool.java:381)
    at com.sun.enterprise.resource.pool.PoolManagerImpl.getResourceFromPool(PoolManagerImpl.java:245)
    at com.sun.enterprise.resource.pool.PoolManagerImpl.getResource(PoolManagerImpl.java:170)
    at com.sun.enterprise.connectors.ConnectionManagerImpl.getResource(ConnectionManagerImpl.java:360)
    at com.sun.enterprise.connectors.ConnectionManagerImpl.internalGetConnection(ConnectionManagerImpl.java:307)
    ... 55 more
Caused by: com.sun.appserv.connectors.internal.api.PoolingException: org.sqlite.JDBC cannot be cast to javax.sql.DataSource
    at com.sun.enterprise.resource.pool.ConnectionPool.createSingleResource(ConnectionPool.java:924)
    at com.sun.enterprise.resource.pool.ConnectionPool.createResource(ConnectionPool.java:1189)
    at com.sun.enterprise.resource.pool.datastructure.RWLockDataStructure.addResource(RWLockDataStructure.java:98)
    ... 65 more
Caused by: com.sun.appserv.connectors.internal.api.PoolingException: org.sqlite.JDBC cannot be cast to javax.sql.DataSource
    at com.sun.enterprise.resource.allocator.LocalTxConnectorAllocator.createResource(LocalTxConnectorAllocator.java:110)
    at com.sun.enterprise.resource.pool.ConnectionPool.createSingleResource(ConnectionPool.java:907)
    ... 67 more
Caused by: javax.resource.ResourceException: org.sqlite.JDBC cannot be cast to javax.sql.DataSource
    at com.sun.gjc.spi.DSManagedConnectionFactory.getDataSource(DSManagedConnectionFactory.java:166)
    at com.sun.gjc.spi.DSManagedConnectionFactory.createManagedConnection(DSManagedConnectionFactory.java:102)
    at com.sun.enterprise.resource.allocator.LocalTxConnectorAllocator.createResource(LocalTxConnectorAllocator.java:87)
    ... 68 more

我在互联网上搜索解决方案，但每次都遇到相同的异常。

谁能帮帮我？？？

【问题讨论】：

标签： java sqlite netbeans


【解决方案1】：

在继续使用 DataSource 池化连接之前，请先检查 SQLite 的单个 JDBC 连接是否正常工作。如果是，那么您可以使用 JNDI 汇集此数据源。

首先重启服务器。

然后在您的 web/META-INF/context.xml 文件中添加对新 jdbc 资源的引用。它定义了一个 JNDI 名称、它的类类型、与我们刚刚在上面安装的 jar 相关的驱动程序类名称，以及一个连接数据库的 url。在我的例子中，我指向文件系统上的一个目录（必须存在）。

<Context>
    <Resource name="jdbc/sqlite"
    type="javax.sql.DataSource"
    driverClassName="org.sqlite.JDBC"
    url="jdbc:sqlite:/var/lib/tomcat7/dbs/test.db"
    />
</Context>

此外，您必须在 web.xml 文件中添加资源。注意名称与上面的名称相同。

...
<resource-ref>
    <res-ref-name>jdbc/sqlite</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
</resource-ref>
...

现在您可以在 Java 代码中引用数据库。这是从 sqlite 示例页面中提取的：

Connection conn = null;
try {
    Context ctx = new InitialContext();
    DataSource ds = (DataSource) ctx.lookup("java:comp/env/jdbc/sqlite");
    conn = ds.getConnection();
    Statement statement = conn.createStatement();
try {
    statement.executeUpdate("create table thing(x integer)");
} catch (Exception e) { 
     // Could well be already there
}
statement.executeUpdate("insert into thing values(42)");
ResultSet rs = statement.executeQuery("select * from thing");
while (rs.next()) {
writer.println("id = " + rs.getInt(1));
} catch (Exception e) {
    writer.println(e.getMessage());
} finally {
    try {
        if (conn != null) conn.close();
    } catch (SQLException e) {
        writer.println(e);
    }
}

【讨论】：

  • 我没有任何 web.xml 文件和 context.xml 文件 直到现在我使用 Netbeans 的嵌入式数据库编写企业应用程序，所以我不需要它们。您确定我在 Java Enterprice 应用程序中需要这些文件吗？这些文件是典型的 Java Web 应用程序
  • 良好的嵌入式环境不会长时间工作，因为最终您会遇到这样的问题。所以请在 xml 文件中进行完整的配置。此外，它还可以帮助您进行调试，并且您的代码将更易于维护和插入。
  • 谢谢你的回复，你真的很有帮助但我有一些疑问，你能建议我如何创建 context.xml 文件吗？ （我只是创建 web.xml）我在哪里添加 java 代码？
  • context.xml 取决于您使用的服务器。它位于服务器配置文件夹中。服务器通常为 JNDI 提供最好的工厂支持。此外，您也可以使用具有自己的 context.xml 配置的框架。示例包括 spring、ejb 等。
【解决方案2】：

我对我的问题进行了几项研究，但我找不到一个很好的解决方案来让一切正常工作，所以我做了一点架构更改，从 (NetBeans) Java EE 企业应用程序转移到 (NetBeans) Java Web 应用程序，我手按照本指南在数据库中建立连接： http://www.codejava.net/java-se/jdbc/connect-to-sqlite-via-jdbc 现在一切似乎都很好。 这不是一个快速的解决方案，但很有效。

【讨论】：

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