JDBC 连接错误

Question

我在 Glassfish 中创建了一个 JDBC 连接池并将其用作 JDBC 资源 "jdbc/__default"。我可以在管理控制台界面成功ping通这个连接池。

然后，我正在尝试运行以下程序：

package de.java2enterprise.onlineshop;

import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;

import javax.annotation.Resource;
import javax.naming.InitialContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;

@WebServlet("/test")
public class TestServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    // @Resource(name="jdbc/__default")
    // private DataSource ds;

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        PrintWriter writer = response.getWriter();
        response.setContentType("text/html;charset=UTF-8");
        writer.println("<!DOCTYPE html>");
        writer.println("<html><body>");

        Connection con = null;
        DataSource ds;
        try {

            ds = (DataSource) InitialContext.doLookup("jdbc/__default");
            con = ds.getConnection();

            if (con.isValid(10)) {
                writer.println("<BR>Connected!");
            }
            con.close();

        } catch (Exception ex) {
            writer.println(ex.getMessage());
        } finally {
            if (con != null){
                try{
                    con.close();
                } catch (Exception ex){

                }
            }
        }
        writer.println("<BR>Test finished!</body></html>");
        writer.close();
    }
}

但是，我在网络浏览器中收到以下错误：

Error in allocating a connection. Cause: Connection could not be allocated because: Listener refused the connection with the following error: ORA-12518, TNS:listener could not hand off client connection Test finished!

在服务器日志中，我收到以下错误：

2015-04-08T08:15:20.540+0200|Information: Loading application [onlineshop#onlineshop-war.war] at [onlineshop-war] 2015-04-08T08:15:20.636+0200|Information: onlineshop was successfully deployed in 611 milliseconds. 2015-04-08T08:15:38.552+0200|Warnung: Context path from ServletContext: /onlineshop-war differs from path from bundle: onlineshop-war 2015-04-08T08:15:38.802+0200|Information: visiting unvisited references 2015-04-08T08:15:39.519+0200|Information: Successfully got INSTRUMENTATION: sun.instrument.InstrumentationImpl@2d618042

2015-04-08T08:15:41.471+0200|Warnung: RAR5038:Unexpected exception while creating resource for pool Onlineshop. Exception : javax.resource.spi.ResourceAllocationException: Connection could not be allocated because: Listener refused the connection with the following error: ORA-12516, TNS:listener could not find available handler with matching protocol stack

2015-04-08T08:15:41.471+0200|Warnung: RAR5117 : Failed to obtain/create connection from connection pool [ Onlineshop ]. Reason : com.sun.appserv.connectors.internal.api.PoolingException: Connection could not be allocated because: Listener refused the connection with the following error: ORA-12516, TNS:listener could not find available handler with matching protocol stack

2015-04-08T08:15:41.486+0200|Warnung: RAR5114 : Error allocating connection : [Error in allocating a connection. Cause: Connection could not be allocated because: Listener refused the connection with the following error: ORA-12516, TNS:listener could not find available handler with matching protocol stack ]

之后，我无法再次 ping 连接池，并在管理控制台中收到或多或少相同的错误。

我使用以下配置：JDK 1.8.0_25，GlassFish Server 开源版 4.1（内部版本 13），Oracle 数据库 XE 11.2。

在 Glassfish 管理控制台中，我创建了以下 JDBC 资源：JNDI 名称：jdbc/__default，逻辑 JNDI 名称：java：comp/DefaultDataSource, 连接池: Onlineshop. JDBC 连接池名称为 Onlineshop，资源类型：javax.sql.DataSource，类名：oracle.jdbc.pool.OracleDataSource。

我的最小池大小为 800 个连接，最大为 3200 个连接。我保留的其他参数，我只在 JDBC 连接池属性中添加了用户和密码。

有人知道吗？ :-)

Answer 1

如果您使用 jdk7+，请在 finally block or in try-with-resources 中关闭您的连接，因为它应该在 Java 中完成。看看有没有帮助

JDBC 连接错误

JDBC connection error

jdbc

glassfish