servlet with weblogic

hi everyone....

When I'm running this program on weblogic server8.1

import java.io.*; import java.sql.*; import javax.servlet.*; import javax.servlet.http.*; class DataInsertion extends HttpServlet { public void doGet(HttpServletRequest req,HttpServletResponse res)throws ServletException, IOException { res.setContentType("text/html"); PrintWriter out=res.getWriter(); String url="jdbc:oracle:thin:@localhost:1521:xe"; Connection conn; ResultSet rs; try{ Class.forName("oracle.jdbc.driver.OracleDriver"); conn=DriverManager.getConnection(url,"system","oracle"); Statement stmt=conn.createStatement(); String qry="insert into emp values('101','ram','design','12000')"; int i=stmt.executeUpdate(qry); if(i!=0){ out.println("The record has been updated"); } else{ out.println("Sorry! Failure"); } rs=stmt.executeQuery("select * from emp"); while(rs.next()){ out.println(rs.getInt(1)+"\t"+rs.getString(2)+"\t"+rs.getString(3)+"\t"+rs.getInt(4)); } rs.close(); stmt.close(); conn.close(); }catch(Exception e){ System.out.println(e); } } }

this error shown...

Error 500--Internal Server Error javax.servlet.ServletException: Servlet class: 'DataInsertion' couldn't be instantiated at weblogic.servlet.internal.ServletStubImpl$ServletInitAction.run()Ljava/lang/Object;(ServletStubImpl.java:1108) at weblogic.security.acl.internal.AuthenticatedSubject.doAs(Lweblogic/security/subject/AbstractSubject;Ljava/security/PrivilegedAction;)Ljava/lang/Object;(AuthenticatedSubject.java:321) at weblogic.security.service.SecurityManager.runAs(Lweblogic/security/acl/internal/AuthenticatedSubject;Lweblogic/security/acl/internal/AuthenticatedSubject;Ljava/security/PrivilegedAction;)Ljava/lang/Object;(Optimized Method) at weblogic.servlet.internal.ServletStubImpl.createServlet()Ljavax/servlet/Servlet;(ServletStubImpl.java:970) at weblogic.servlet.internal.ServletStubImpl.createInstances()V(ServletStubImpl.java:949) at weblogic.servlet.internal.ServletStubImpl.prepareServlet(Lweblogic/servlet/internal/RequestCallback;)V(ServletStubImpl.java:888) at weblogic.servlet.internal.ServletStubImpl.getServlet(Lweblogic/servlet/internal/RequestCallback;)Ljavax/servlet/Servlet;(ServletStubImpl.java:598) at weblogic.servlet.internal.ServletStubImpl.invokeServlet(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Lweblogic/servlet/internal/FilterChainImpl;)V(ServletStubImpl.java:406) at weblogic.servlet.internal.ServletStubImpl.invokeServlet(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(ServletStubImpl.java:348) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run()Ljava/lang/Object;(WebAppServletContext.java:6981) at weblogic.security.acl.internal.AuthenticatedSubject.doAs(Lweblogic/security/subject/AbstractSubject;Ljava/security/PrivilegedAction;)Ljava/lang/Object;(AuthenticatedSubject.java:321) at weblogic.security.service.SecurityManager.runAs(Lweblogic/security/acl/internal/AuthenticatedSubject;Lweblogic/security/acl/internal/AuthenticatedSubject;Ljava/security/PrivilegedAction;)Ljava/lang/Object;(Optimized Method) at weblogic.servlet.internal.WebAppServletContext.invokeServlet(Lweblogic/servlet/internal/ServletRequestImpl;Lweblogic/servlet/internal/ServletResponseImpl;)V(WebAppServletContext.java:3892) at weblogic.servlet.internal.ServletRequestImpl.execute(Lweblogic/kernel/ExecuteThread;)V(ServletRequestImpl.java:2766) at weblogic.kernel.ExecuteThread.execute(Lweblogic/kernel/ExecuteRequest;)V(ExecuteThread.java:224) at weblogic.kernel.ExecuteThread.run()V(ExecuteThread.java:183) at java.lang.Thread.startThreadFromVM(Ljava/lang/Thread;)V(Unknown Source)

plz tell me how i can solve this problem.. Thanks