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带有 tomcat 6.0.26 的 JNDI ClassCastException

[英]JNDI ClassCastException with tomcat 6.0.26

 原文  2010-07-24 23:57:38  8   1    java/ tomcat/ jdbc/ jakarta-ee/ jndi

问题描述

I am developing a webapp that requires setting up a DataSource with JNDI using Enterprise JDBC Classes.I am using the Netbeans 6.9 bundled tomcat (6.0.26 app) server with mysql 5.xx.The issue really is that I can still see the database values from a relation being displayed in my jsp page whereas during the tomcat initialization it says something like this:我正在开发一个需要使用企业 JDBC 类设置带有 JNDI 的数据源的 web 应用程序。我正在使用 Netbeans 6.9 捆绑的 tomcat（6.0.26 应用程序）服务器和 mysql 5.xx。问题确实是我仍然可以看到数据库来自在我的 jsp 页面中显示的关系的值，而在 tomcat 初始化期间它说的是这样的：

. . . .

SEVERE: Servlet.service() for servlet jsp threw exception
java.lang.ClassCastException: org.apache.tomcat.dbcp.dbcp.BasicDataSource cannot be cast to javax.naming.Context
        at org.apache.jsp.Hello_jsp._jspService(Hello_jsp.java:141)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
        at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:859)
        at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)
        at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1555)
        at java.lang.Thread.run(Thread.java:619)
Jul 25, 2010 1:28:25 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextDestroyed()
Jul 25, 2010 1:28:25 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextDestroyed()
Jul 25, 2010 1:28:32 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextInitialized()
Jul 25, 2010 1:28:32 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextInitialized()
Jul 25, 2010 1:28:40 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet jsp threw exception
javax.naming.NameNotFoundException: Name nexusirm is not bound in this Context
        at org.apache.naming.NamingContext.lookup(NamingContext.java:770)
        at org.apache.naming.NamingContext.lookup(NamingContext.java:140)
        at org.apache.naming.NamingContext.lookup(NamingContext.java:781)
        at org.apache.naming.NamingContext.lookup(NamingContext.java:140)
        at org.apache.naming.NamingContext.lookup(NamingContext.java:781)
        at org.apache.naming.NamingContext.lookup(NamingContext.java:140)
        at org.apache.naming.NamingContext.lookup(NamingContext.java:781)
        at org.apache.naming.NamingContext.lookup(NamingContext.java:153)
        at org.apache.naming.SelectorContext.lookup(SelectorContext.java:152)
        at javax.naming.InitialContext.lookup(InitialContext.java:392)
        at org.apache.jsp.Hello_jsp._jspService(Hello_jsp.java:141)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
        at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:859)
        at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)
        at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1555)
        at java.lang.Thread.run(Thread.java:619)
Jul 25, 2010 1:29:50 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet jsp threw exception
javax.naming.NameNotFoundException: Name jdbc is not bound in this Context
        at org.apache.naming.NamingContext.lookup(NamingContext.java:770)
        at org.apache.naming.NamingContext.lookup(NamingContext.java:153)
        at org.apache.naming.SelectorContext.lookup(SelectorContext.java:152)
        at javax.naming.InitialContext.lookup(InitialContext.java:392)
        at org.apache.jsp.Hello_jsp._jspService(Hello_jsp.java:143)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
        at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:859)
        at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)
        at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1555)
        at java.lang.Thread.run(Thread.java:619)
Jul 25, 2010 1:30:10 AM org.apache.catalina.core.ApplicationContext log

. . . .

I have the following inside my /WEB-INF/web.xml我的 /WEB-INF/web.xml 中有以下内容

<resource-ref>
         <res-ref-name>jdbc/NexusIRM</res-ref-name>
         <res-type>javax.sql.DataSource</res-type>
         <res-auth>Container</res-auth>
         <res-sharing-scope>Shareable</res-sharing-scope> 
</resource-ref>

And the following in my /META-INF/context.xml以及我的 /META-INF/context.xml 中的以下内容

 <Resource name="jdbc/NexusIRM"
           auth="Container"
           type="javax.sql.DataSource"
           driverClassName="com.mysql.jdbc.Driver"
           url="jdbc:mysql://localhost:3306/nexusirm"
           username="root"
           password=""
           maxActive="20"
           maxIdle="30"
           maxWait="-1"
 
 />

My Application code looks like:我的应用程序代码如下所示：

                <%
 try{

Context initCtx = new InitialContext();

DataSource ds = (DataSource)
  initCtx.lookup("java:comp/env/jdbc/NexusIRM");

Connection conn=ds.getConnection();

Statement stmt=conn.createStatement();
ResultSet rs=stmt.executeQuery("SELECT * FROM irm_gtresult");

if(rs.next())
    {
    for(int i=1;i<9;i++){
out.write(rs.getString(i));
}
}
conn.close();
}catch(SQLException e)
{out.write(e.getMessage());
e.printStackTrace();}

%>

I am just curious to why these exceptions are being thrown while the application is being executed perfectly!我只是好奇为什么在完美执行应用程序时会抛出这些异常！

1 个解决方案

解决方案1
 1 已采纳  2010-07-25 00:58:27

Try this ...尝试这个 ...

Connection conn;
try
{   
    // Obtain our environment naming context
    Context initCtx = new InitialContext();
    Context envCtx = (Context) initCtx.lookup("java:comp/env");

    // Look up our data source
    DataSource ds = (DataSource)
      envCtx.lookup("jdbc/NexusIRM");

    // Allocate and use a connection from the pool
    Connection conn = ds.getConnection();
    ... use this connection to access the database ...
}
finally
{
   if(conn != null)
       conn.close();
}

NOTE: Make sure you put your close in a finally !!!注意：确保你把你的关闭放在最后！！！

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