&引用；java.sql.SQLException:连接已关闭"；关闭连接后

我使用weblogic应用服务器和oracle数据库。我使用jdbc与oracle数据库通信。我从weblogic数据源获得连接，并向表中插入一条记录。问题是，当我想关闭连接（插入数据库后）时，我会遇到一个异常（连接已经关闭）。这是我的代码：

private Connection getConnection() {
    try {
        Context context = new InitialContext();
        DataSource datasource = (DataSource) context.lookup("jdbc/datasource-uat");
        Connection connection = datasource.getConnection();
        connection.setAutoCommit(false);
        return connection;
    } catch (Throwable throwable) {
        throwable.printStackTrace();
        return null;
    }
}


    public void persist(Long id) {
    Connection connection = null;
    try {
        connection = getConnection();
        PreparedStatement preparedStatement;
        ResultSet resultSet = null;
        if (id == 0L) {
            synchronized (this) {
                preparedStatement = connection.prepareStatement("SELECT MY_BEAN_SEQ.NEXTVAL FROM DUAL");
                resultSet = preparedStatement.executeQuery();
            }
            resultSet.next();
            id = resultSet.getLong("NEXTVAL");
        }

        preparedStatement = connection.prepareStatement("INSERT INTO MY_BEAN (ID) VALUES (?)");
        preparedStatement.setLong(1, id);
        preparedStatement.executeUpdate();
        connection.commit();
        if (resultSet != null) {
            resultSet.close();
        }
        preparedStatement.close();


    } catch (Throwable throwable) {
        throwable.printStackTrace();
    }

    finally {
        closeConnection(connection);
    }
}


private void closeConnection(Connection connection) {
    if (connection != null)
        try {
            connection.close();
        } catch (Throwable throwable) {
            throwable.printStackTrace();
        }
}

但connection.close语句引发异常：

java.sql.SQLException: Connection has already been closed.
at weblogic.jdbc.wrapper.PoolConnection.checkConnection(PoolConnection.java:62)
at weblogic.jdbc.wrapper.Connection.preInvocationHandler(Connection.java:100)
at weblogic.jdbc.wrapper.Connection.getMetaData(Connection.java:476)
at com.DataAccess.closeConnection(DataAccess.java:61)
at com.DataAccess.persist(DataAccess.java:289)
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 org.apache.cxf.service.invoker.AbstractInvoker.performInvocation(AbstractInvoker.java:188)
at org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:104)
at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:204)
at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:101)
at org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:58)
at org.apache.cxf.interceptor.ServiceInvokerInterceptor.handleMessage(ServiceInvokerInterceptor.java:94)
at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:272)
at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121)
at org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:249)
at org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:248)
at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:222)
at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:153)
at org.apache.cxf.transport.servlet.CXFNonSpringServlet.invoke(CXFNonSpringServlet.java:181)
at org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:289)
at org.apache.cxf.transport.servlet.AbstractHTTPServlet.doPost(AbstractHTTPServlet.java:209)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:265)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:301)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:184)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3732)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3696)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2273)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2179)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1490)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:256)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)

我试图避免使用connection.close语句（因为我教过连接是自动关闭的！！但过了一段时间，所有连接都被打开，并因此引发异常）

尝试使用“自动”关闭连接

---

类似于

请查看示例以供参考。

那么，关于此错误消息是否有很多问题？发帖前你做过调查吗？@Tim Biegeleisen:你刚才删除了你的答案吗？无论如何，在我的情况下，我不知道什么是这个例外的原因。你有吗？如果连接仍然打开，那么在closeConnection方法中添加一个check，比如

if（connection！=null&&connection.isOpen（））

（我不记得确切的语法）@levian并在他的代码中向下滚动。他已经这么做了。@TimBiegeleisen没人，他只是在检查是不是！=我使用jdk6，所以我不能使用try-with-resources。