guaikyokyo 2009-11-07 15:45
浏览 250
已采纳

数据库连接池的问题

老是报下面的错：

org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1150)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
at cn.netjava.dao.GetConn.getConn(GetConn.java:49)
at cn.netjava.dao.DaoUserInfo.login(DaoUserInfo.java:34)
at cn.netjava.filter.HomePageFilter.doFilter(HomePageFilter.java:44)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at cn.netjava.filter.CharsetFilter.doFilter(CharsetFilter.java:31)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at cn.netjava.filter.IsLoginedFilter.doFilter(IsLoginedFilter.java:50)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.NullPointerException
at sun.jdbc.odbc.JdbcOdbcDriver.getProtocol(JdbcOdbcDriver.java:507)
at sun.jdbc.odbc.JdbcOdbcDriver.knownURL(JdbcOdbcDriver.java:476)
at sun.jdbc.odbc.JdbcOdbcDriver.acceptsURL(JdbcOdbcDriver.java:307)
at java.sql.DriverManager.getDriver(DriverManager.java:253)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1143)
... 24 more
java.lang.NullPointerException
at cn.netjava.dao.DaoUserInfo.login(DaoUserInfo.java:37)
at cn.netjava.filter.HomePageFilter.doFilter(HomePageFilter.java:44)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at cn.netjava.filter.CharsetFilter.doFilter(CharsetFilter.java:31)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at cn.netjava.filter.IsLoginedFilter.doFilter(IsLoginedFilter.java:50)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Thread.java:619)
数据库连接失败，请检查!
org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1150)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
at cn.netjava.dao.GetConn.getConn(GetConn.java:49)
at cn.netjava.dao.DaoArticleInfo.getHottestArticles(DaoArticleInfo.java:189)
at org.apache.jsp.homepage_jsp._jspService(homepage_jsp.java:109)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at cn.netjava.filter.HomePageFilter.doFilter(HomePageFilter.java:51)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at cn.netjava.filter.CharsetFilter.doFilter(CharsetFilter.java:31)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at cn.netjava.filter.IsLoginedFilter.doFilter(IsLoginedFilter.java:50)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
at org.apache.coyot

[b]我的server.xml的配置为：[/b]

    <Context path="/TlsBlog" docBase="TlsBlog" reloadable="true">
                <Resource name="TlsBlog" auth="Container" type="javax.sql.DataSource"/>
                <ResourceParams name="TlsBlog">
                    <parameter>
                        <name>factory</name>
                        <value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
                    </parameter>

                    <!-- DBCP database connection settings -->
                     <parameter>
                        <name>driverClassName</name>
                        <value>com.mysql.jdbc.Driver</value>
                    </parameter>
                    <parameter>
                        <name>url</name>
                        <value>jdbc:mysql://localhost:3306/blogdatesystem?autoReconnect=true</value>
                    </parameter>

                    <parameter>
                        <name>username</name>
                        <value>root</value>
                    </parameter>
                    <parameter>
                        <name>password</name>
                        <value>netjava</value>
                    </parameter>

                    <!-- DBCP connection pooling options -->
                    <parameter>
                        <name>maxWait</name>
                        <value>1000</value>
                    </parameter>
                    <parameter>
                        <name>maxIdle</name>
                        <value>10</value>
                    </parameter>
                    <parameter>
                        <name>maxActive</name>
                        <value>100</value>
                    </parameter>
                </ResourceParams>
            </Context>

  </Host>

[b]web.xml的配置如下[/b]：

TlsBlog
javax.sql.DataSource
Container

[b]加载的包如附件图：[/b]

[b]得到connection的代码如下：[/b]

public Connection getConn(){

    try{

    Context context = new InitialContext();
    DataSource ds = (DataSource)context.lookup("java:comp/env/TlsBlog");
    Connection conn = ds.getConnection();
    return conn;

    }catch(Exception et){
        System.out.println("数据库连接失败，请检查!");
        et.printStackTrace();
        return null;
    }

}

请问达人，错在哪里啊？跪谢~！

  • 写回答

2条回答 默认 最新

  • iteye_7589 2009-11-07 18:30
    关注

    Please note that JNDI resource configuration has changed somewhat between Tomcat 5.0.x and Tomcat 5.5.x. You will most likely need to modify your JNDI resource configurations to match the syntax in the example below in order to make them work in Tomcat 5.5.x.

    maxActive="100" maxIdle="30" maxWait="10000"
    username="javauser" password="javadude" driverClassName="com.mysql.jdbc.Driver"
    url="jdbc:mysql://localhost:3306/javatest?autoReconnect=true"/>

    直接在Resource Element里填属性了。

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论
查看更多回答(1条)

报告相同问题？

悬赏问题

  • ¥15 Python时间序列如何拟合疏系数模型
  • ¥15 求学软件的前人们指明方向🥺
  • ¥50 如何增强飞上天的树莓派的热点信号强度，以使得笔记本可以在地面实现远程桌面连接
  • ¥15 MCNP里如何定义多个源？
  • ¥20 双层网络上信息-疾病传播
  • ¥50 paddlepaddle pinn
  • ¥20 idea运行测试代码报错问题
  • ¥15 网络监控：网络故障告警通知
  • ¥15 django项目运行报编码错误
  • ¥15 STM32驱动继电器