带有tomcat 6.0.26的JNDI ClassCastException [英] JNDI ClassCastException with tomcat 6.0.26
本文介绍了带有tomcat 6.0.26的JNDI ClassCastException的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在开发一个Web应用程序，该Web应用程序需要使用Enterprise JDBC类使用JNDI设置数据源.我正在将Netbeans 6.9捆绑的tomcat(6.0.26 app)服务器与mysql 5.xx一起使用.问题确实是我仍然可以看到我的jsp页面中显示的关系中的数据库值，而在tomcat初始化过程中，它表示如下:
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:
.
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
.
我的/WEB-INF/web.xml中包含以下内容
I have the following inside my /WEB-INF/web.xml
<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>
以及我的/META-INF/context.xml中的以下内容
And the following in my /META-INF/context.xml
<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"
/>
我的应用程序代码如下:
My Application code looks like:
<%
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();}
%>
我很好奇为什么在完美执行应用程序时会抛出这些异常！
I am just curious to why these exceptions are being thrown while the application is being executed perfectly!
推荐答案
尝试一下...
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();
}
注意:请确保您最后关门！！！
NOTE: Make sure you put your close in a finally !!!
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