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Class Cast Exception in Portable Remote Object

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vishal2901 vishal2901 is offline Offline
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Class Cast Exception in Portable Remote Object

 
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  #1
Jul 14th, 2008
Hai guys,

I am new at jsp.I have made a simple j2ee application in which i am getting class cast exception in PortableRemoteObject.narrow function.

The exception is:
JSP Syntax (Toggle Plain Text) 
  1. org.apache.jasper.JasperException
  2. org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:384)
  3. org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:297)
  4. org.apache.jasper.servlet.JspServlet.service(JspServlet.java:247)
  5. javax.servlet.http.HttpServlet.service(HttpServlet.java:860)
  6. sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  7. sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  8. sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  9. java.lang.reflect.Method.invoke(Method.java:585)
  10. org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:249)
  11. java.security.AccessController.doPrivileged(Native Method)
  12. javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
  13. org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:282)
  14. org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:165)

The root cause is :
JSP Syntax (Toggle Plain Text) 
  1. java.lang.ClassCastException
  2. com.sun.corba.ee.impl.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:229)
  3. javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:137)
  4. org.apache.jsp.registration_jsp._jspService(registration_jsp.java:59)
  5. org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:105)
  6. javax.servlet.http.HttpServlet.service(HttpServlet.java:860)
  7. org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:336)
  8. org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:297)
  9. org.apache.jasper.servlet.JspServlet.service(JspServlet.java:247)
  10. javax.servlet.http.HttpServlet.service(HttpServlet.java:860)
  11. sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  12. sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  13. sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  14. java.lang.reflect.Method.invoke(Method.java:585)
  15. org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:249)
  16. java.security.AccessController.doPrivileged(Native Method)
  17. javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
  18. org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:282)
  19. org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:165)


The code of the file is :
JSP Syntax (Toggle Plain Text) 
  1. <%@ page language="java" import="java.sql.,pkg.,javax.ejb.,javax.naming.,javax.rmi.PortableRemoteObject,java.rmi.RemoteException" %>
  2. <html>
  3. <head>
  4. <title></title>
  5. </head>
  6. <body bgcolor="CCCCFF">
  7. <h1><center>Welcome to MyBank</center></h1>
  8. <%
  9. InitialContext initial = new InitialContext();
  10. Object objref = initial.lookup("bankDSN");
  11. pkg.mybankHome vi = (pkg.mybankHome)PortableRemoteObject.narrow(objref,pkg.mybankHome.class);
  12. %>
  13. </body>
  14. </html>

I have read many threads but i was not able to solve this problem.
It has been 2 to 3 weeks that i am struck in this error.
Plz help me with this.

Thanks in advance.
Last edited by peter_budo; Jul 14th, 2008 at 8:41 pm. Reason: Keep It Organized - please use [code] tags
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ejosiah ejosiah is offline Offline
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Re: Class Cast Exception in Portable Remote Object

 
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  #2
Jul 14th, 2008
The simple anwser to this is that pkg.mybankHome and PortableRemoteObject.narrow are not of the same type or do not belong to the same class hierarchy. In simple terms u cant do this

Cat cat = (cat)new Dog();

or can you?

Think about this for a sec.
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