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Oracle 中使用 Jetty 的连接池

[英]Connection Pooling using Jetty, in Oracle

 原文  2015-10-30 07:22:02  6   4    java/ eclipse/ oracle/ jetty/ connection-pooling

问题描述

I am trying to implement the concept of ConnectionPooling in Oracle using Jetty server.我正在尝试使用Jetty服务器在Oracle实现ConnectionPooling的概念。 I have tried the following that I saw on a tutorial.我已经尝试了我在教程中看到的以下内容。 It is working if I deploy using Tomcat server, but Jetty seems to be giving me an unusual error .如果我使用Tomcat服务器进行部署，它就可以工作，但Jetty似乎给了我一个不寻常的error 。 Details are below -详情如下——

I have a class called TestServlet.java defined as -我有一个名为TestServlet.java的类定义为 -

import java.io.IOException;
import java.sql.*;
import javax.naming.*;
import javax.servlet.*;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
import javax.sql.DataSource;


@SuppressWarnings("serial")
@WebServlet("/TestServlet")
public class TestServlet extends HttpServlet {
public TestServlet() throws ServletException{
    System.out.println("Constructor");
    init();
}
public DataSource dataSource;
private Connection con;
private Statement statement;

public void init() throws ServletException {
    System.out.println("inside init method");
    try {
        // Get DataSource
        Context initContext  = new InitialContext();
        System.out.println("Before envcontext");
        Context envContext  = (Context)initContext.lookup("java:comp/env");
        System.out.println("After envcontext");
        dataSource = (DataSource)envContext.lookup("jdbc/DSTest");
        System.out.println(dataSource.toString());
    } catch (NamingException e) {
        System.out.println("Exception in try");
        e.printStackTrace();
    }
}

public void doGet(HttpServletRequest req, HttpServletResponse resp)
        throws ServletException, IOException {
    System.out.println("Request: "+req+"\tResponse: "+resp);
     int i=0;
    ResultSet resultSet = null;
    try {
        // Get Connection and Statement
        con = dataSource.getConnection();
        statement = con.createStatement();
        String query = "SELECT * FROM USER";
        resultSet = statement.executeQuery(query);
        while (resultSet.next()) {
            ++i;
            System.out.println(i+":\nID:"+resultSet.getString("ID") +"\nEmail:"+ resultSet.getString("UEMAIL") +"\nPassword:" + resultSet.getString("PASSWORD")+"\nFlag:"+resultSet.getShort("FLAG")
                    +"\n");

        }
    } catch (SQLException e) {
        System.out.println("EXCEPTIOn");
        e.printStackTrace();
    }finally {
        try { if(null!=resultSet)resultSet.close();} catch (SQLException e) 
        {e.printStackTrace();System.out.println("1");}
        try { if(null!=statement)statement.close();} catch (SQLException e) 
        {e.printStackTrace();System.out.println("2");}
        try { if(null!=con)con.close();} catch (SQLException e) 
        {e.printStackTrace();System.out.println("3");}
    }
}

} }

And my Jetty-web.xml is as -我的Jetty-web.xml是 -

<?xml version="1.0" encoding="UTF-8"?>
<Configure class="org.eclipse.jetty.webapp.WebAppContext">
<New id="DSTest" class="org.eclipse.jetty.plus.jndi.Resource">
 <Arg>java:comp/env</Arg>
 <Arg>jdbc/DSTest</Arg>
 <Arg>
     <New class="org.apache.commons.dbcp.BasicDataSource">
        <Set name="driverClassName">oracle.jdbc.OracleDriver</Set>
        <Set  name="url">ConnectionUrl</Set>
        <Set name="username">app_user</Set>
        <Set name="password">abcd</Set>
     </New>
 </Arg>
</New>
</Configure>

When I run the servlet class I get an error that says -当我运行servlet类时，我收到一条错误消息 -

java.lang.NoClassDefFoundError: org/apache/commons/pool/impl/GenericObjectPool
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2658)
at java.lang.Class.getConstructors(Class.java:1638)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.newObj(XmlConfiguration.java:748)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.itemValue(XmlConfiguration.java:1078)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.value(XmlConfiguration.java:993)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.newObj(XmlConfiguration.java:741)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.configure(XmlConfiguration.java:383)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.configure(XmlConfiguration.java:317)
at org.eclipse.jetty.xml.XmlConfiguration.configure(XmlConfiguration.java:276)
at org.eclipse.jetty.webapp.JettyWebXmlConfiguration.configure(JettyWebXmlConfiguration.java:100)
at org.eclipse.jetty.webapp.WebAppContext.configure(WebAppContext.java:427)
at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1207)
at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:610)
at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:453)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59)
at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:89)
at org.eclipse.jetty.server.Server.doStart(Server.java:262)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59)
at runjettyrun.Bootstrap.main(Bootstrap.java:80)
Caused by: 
java.lang.ClassNotFoundException: org.apache.commons.pool.impl.GenericObjectPool
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:415)
at runjettyrun.ProjectClassLoader.loadClass(ProjectClassLoader.java:92)
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2658)
at java.lang.Class.getConstructors(Class.java:1638)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.newObj(XmlConfiguration.java:748)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.itemValue(XmlConfiguration.java:1078)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.value(XmlConfiguration.java:993)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.newObj(XmlConfiguration.java:741)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.configure(XmlConfiguration.java:383)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.configure(XmlConfiguration.java:317)
at org.eclipse.jetty.xml.XmlConfiguration.configure(XmlConfiguration.java:276)
at org.eclipse.jetty.webapp.JettyWebXmlConfiguration.configure(JettyWebXmlConfiguration.java:100)
at org.eclipse.jetty.webapp.WebAppContext.configure(WebAppContext.java:427)
at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1207)
at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:610)
at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:453)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59)
at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:89)
at org.eclipse.jetty.server.Server.doStart(Server.java:262)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59)
at runjettyrun.Bootstrap.main(Bootstrap.java:80)
2015-10-30 14:22:51.172:INFO:oejs.AbstractConnector:Started     SelectChannelConnector@0.0.0.0:8081 STARTING
2015-10-30 14:22:51.172:WARN:oejuc.AbstractLifeCycle:FAILED   org.eclipse.jetty.server.Server@7857fe2: java.lang.NoClassDefFoundError:   org/apache/commons/pool/impl/GenericObjectPool
java.lang.NoClassDefFoundError: org/apache/commons/pool/impl/GenericObjectPool
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2658)
at java.lang.Class.getConstructors(Class.java:1638)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.newObj(XmlConfiguration.java:748)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.itemValue(XmlConfiguration.java:1078)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.value(XmlConfiguration.java:993)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.newObj(XmlConfiguration.java:741)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.configure(XmlConfiguration.java:383)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.configure(XmlConfiguration.java:317)
at org.eclipse.jetty.xml.XmlConfiguration.configure(XmlConfiguration.java:276)
at org.eclipse.jetty.webapp.JettyWebXmlConfiguration.configure(JettyWebXmlConfiguration.java:100)
at org.eclipse.jetty.webapp.WebAppContext.configure(WebAppContext.java:427)
at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1207)
at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:610)
at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:453)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59)
at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:89)
at org.eclipse.jetty.server.Server.doStart(Server.java:262)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59)
at runjettyrun.Bootstrap.main(Bootstrap.java:80)
Caused by: 
java.lang.ClassNotFoundException: org.apache.commons.pool.impl.GenericObjectPool
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:415)
at runjettyrun.ProjectClassLoader.loadClass(ProjectClassLoader.java:92)
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2658)
at java.lang.Class.getConstructors(Class.java:1638)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.newObj(XmlConfiguration.java:748)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.itemValue(XmlConfiguration.java:1078)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.value(XmlConfiguration.java:993)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.newObj(XmlConfiguration.java:741)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.configure(XmlConfiguration.java:383)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.configure(XmlConfiguration.java:317)
at org.eclipse.jetty.xml.XmlConfiguration.configure(XmlConfiguration.java:276)
at org.eclipse.jetty.webapp.JettyWebXmlConfiguration.configure(JettyWebXmlConfiguration.java:100)
at org.eclipse.jetty.webapp.WebAppContext.configure(WebAppContext.java:427)
at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1207)
at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:610)
at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:453)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59)
at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:89)
at org.eclipse.jetty.server.Server.doStart(Server.java:262)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59)
at runjettyrun.Bootstrap.main(Bootstrap.java:80)
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/pool/impl/GenericObjectPool
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2658)
at java.lang.Class.getConstructors(Class.java:1638)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.newObj(XmlConfiguration.java:748)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.itemValue(XmlConfiguration.java:1078)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.value(XmlConfiguration.java:993)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.newObj(XmlConfiguration.java:741)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.configure(XmlConfiguration.java:383)
at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.configure(XmlConfiguration.java:317)
at org.eclipse.jetty.xml.XmlConfiguration.configure(XmlConfiguration.java:276)
at org.eclipse.jetty.webapp.JettyWebXmlConfiguration.configure(JettyWebXmlConfiguration.java:100)
at org.eclipse.jetty.webapp.WebAppContext.configure(WebAppContext.java:427)
at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1207)
at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:610)
at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:453)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59)
at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:89)
at org.eclipse.jetty.server.Server.doStart(Server.java:262)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59)
at runjettyrun.Bootstrap.main(Bootstrap.java:80)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.pool.impl.GenericObjectPool
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:415)
at runjettyrun.ProjectClassLoader.loadClass(ProjectClassLoader.java:92)
... 20 more

I have added the commons-dbcp-1.4.jar to my WEB-INF/lib folder in eclipse after looking at other stackoverflow threads.在查看其他 stackoverflow 线程后，我已将commons-dbcp-1.4.jar添加到commons-dbcp-1.4.jar中的WEB-INF/lib文件夹中。 Even after doing that, I am getting the same error when I deploy on Jetty .即使这样做之后，我在Jetty部署时也会遇到同样的错误。

I am using jetty server version 8 integrated with eclipse luna 4.4.1.我正在使用与eclipse luna 4.4.1 集成的jetty服务器版本 8。

Any help much appreciated.非常感谢任何帮助。

4 个解决方案

解决方案1
 5 已采纳  2015-11-05 22:46:05

You have 3 ways to do it:你有 3 种方法来做到这一点：

  1. If you are using maven or gradle in your project simply add commons-pool dependency to your pom.xml or build.gradle file (recommended way)如果您在项目中使用 maven 或 gradle，只需将 commons-pool 依赖项添加到 pom.xml 或 build.gradle 文件中（推荐方式）
  2. If you are not using one of the mentioned tools place correct jar in the WEB-INF/lib directory如果您不使用上述工具之一，请将正确的 jar 放在 WEB-INF/lib 目录中
  3. The last one is to place jar in ${jettyHome}/lib directory最后一个是将jar放在${jettyHome}/lib目录下

Make sure that you are using correct version of the commons-pool for your current commons-dbcp implementation确保您为当前的 commons-dbcp 实现使用了正确版本的 commons-pool

解决方案2
 1  2015-11-10 08:59:42

you don't you just use tomcat instead.你不只是使用tomcat。 find it here http://tomcat.apache.org/ :) Note that jetty is only well to be used when you need to make local app development easier.在此处找到它http://tomcat.apache.org/ :)请注意，仅当您需要使本地应用程序开发更容易时才可以使用 jetty。 https://tomcat.apache.org/tomcat-7.0-doc/jdbc-pool.html I suggest you start reading up the basics for tomcat and as you begin to gain a basic understanding of how things work, you should start implementing Connection Pooling :) Hope this helps. https://tomcat.apache.org/tomcat-7.0-doc/jdbc-pool.html我建议你开始阅读tomcat的基础知识，当你开始对事情的工作原理有一个基本的了解时，你应该开始实现Connection Pooling :) 希望这会Connection Pooling帮助。

解决方案3
 0  2021-04-26 15:26:23

For Jetty 10.x you could resolve it in the following way,对于 Jetty 10.x，您可以通过以下方式解决它，

  1. Enable ext module -> java -jar start.jar --add-modules=ext启用ext module -> java -jar start.jar --add-modules=ext
  2. In $JETTY_BASE/start.d/ext.ini will get created after execution of 1)在$JETTY_BASE/start.d/ext.ini将在执行后创建 1)
  3. Place your oralce jdbc jar file in location $JETTY_HOME/lib/ext/将您的oralce jdbc jar 文件放在$JETTY_HOME/lib/ext/
  4. Again start your application -> java -jar start.jar再次启动您的应用程序 -> java -jar start.jar

解决方案4
 -1  2015-11-10 20:58:38

When i need an Oracle connection pool, i always use ojdbcx.jar with ucp.jar.当我需要 Oracle 连接池时，我总是将 ojdbcx.jar 与 ucp.jar 一起使用。 You can download them from here .您可以从这里下载它们。

You can find tons of how-tos from Google but there is an easy one(for Jetty 6) here .你可以找到吨入门指南从谷歌，但有一个简单的一个（码头6） 在这里。

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