Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

java.lang.classcastexception

Posted on 2002-05-03
3
Medium Priority
?
790 Views
Last Modified: 2012-06-21
What is this telling me?  Is it saying the java.lang.classcastexception
cannot be found or is it one or more of the others that the java.lang.classcastexception calls that can't be found? Is java.lang.classcastexception not part of the base java package?  What are all those com.ibm.servlet things for?
[5/3/02 16:33:45:814 PDT] 6821c026 WebGroup      X Servlet Error-[CSUHDatabaseConnLoader]: Failed to load servlet: java.lang.ClassCastException: DatabaseConnLoader
     at com.ibm.servlet.engine.webapp.WebAppServletManager.loadServlet(WebAppServletManager.java:147)
     at com.ibm.servlet.engine.webapp.WebAppServletManager.loadAutoLoadServlets(WebAppServletManager.java:357)
     at com.ibm.servlet.engine.webapp.WebApp.loadServletManager(WebApp.java:1172)
     at com.ibm.servlet.engine.webapp.WebApp.init(WebApp.java:141)
     at com.ibm.servlet.engine.srt.WebGroup.loadWebApp(WebGroup.java:235)
     at com.ibm.servlet.engine.srt.WebGroup.init(WebGroup.java:144)
     at com.ibm.servlet.engine.ServletEngine.addWebApplication(ServletEngine.java:652)
     at com.ibm.ws.runtime.WebContainer.install(WebContainer.java:36)
     at com.ibm.ws.runtime.Server.startModule(Server.java:617)
     at com.ibm.ws.runtime.StandardServer.initializeModules(StandardServer.java:333)
     at com.ibm.ws.runtime.StandardServer.initializeRuntime0(StandardServer.java:349)
     at com.ibm.ws.runtime.Server.initializeRuntime(Server.java:884)
     at com.ibm.ws.runtime.StandardServer.main(StandardServer.java:519)
     at java.lang.reflect.Method.invoke(Native Method)
     at com.ibm.ws.bootstrap.WSLauncher.main(WSLauncher.java:158)
0
Comment
Question by:xoxomos
  • 2
3 Comments
 
LVL 92

Accepted Solution

by:
objects earned 200 total points
ID: 6990071
A ClassCastException is part of the base Java package and is throw when an invalid cast is attempted.
From the Javadoc:

Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not an instance. For example, the following code generates a ClassCastException:


     Object x = new Integer(0);
     System.out.println((String)x);

> What are all those com.ibm.servlet things for?

Thats just the stack trace showing the call stack when the error occurred.

0
 

Author Comment

by:xoxomos
ID: 6990576
The com.ibm.servlet things are from Visual Age java's Websphere Test Environment.  I compiled a bunch of servlets using VAJava then tried moving to WebSphere Application Server.  I get exceptions then have to import these packages from WTE to Websphere to get to the next exception. Finally added entire WTE as part of classpath but now its calling for a method in a class, but the method does not exist in that class.
Got a whole bunch of questions over in the Websphere section you might understand.  Will be putting this out as question later.
Error Message: com.ibm.servlet.engine.webapp.ServletReference: method isJspType()Z not found
Error Code: 500
Target Servlet: null
Error Stack:
java.lang.NoSuchMethodError: com.ibm.servlet.engine.webapp.ServletReference: method isJspType()Z not found
     at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:359)
     at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:278)
     at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:105)
     at com.ibm.servlet.engine.srt.WebAppInvoker.doForward(WebAppInvoker.java:67)
     
0
 

Author Comment

by:xoxomos
ID: 6990612
The com.ibm.servlet things are from Visual Age java's Websphere Test Environment.  I compiled a bunch of servlets using VAJava then tried moving to WebSphere Application Server.  I get exceptions then have to import these packages from WTE to Websphere to get to the next exception. Finally added entire WTE as part of classpath but now its calling for a method in a class, but the method does not exist in that class.
Got a whole bunch of questions over in the Websphere section you might understand.  Will be putting this out as question later.
Error Message: com.ibm.servlet.engine.webapp.ServletReference: method isJspType()Z not found
Error Code: 500
Target Servlet: null
Error Stack:
java.lang.NoSuchMethodError: com.ibm.servlet.engine.webapp.ServletReference: method isJspType()Z not found
     at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:359)
     at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:278)
     at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:105)
     at com.ibm.servlet.engine.srt.WebAppInvoker.doForward(WebAppInvoker.java:67)
     
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

An old method to applying the Singleton pattern in your Java code is to check if a static instance, defined in the same class that needs to be instantiated once and only once, is null and then create a new instance; otherwise, the pre-existing insta…
For beginner Java programmers or at least those new to the Eclipse IDE, the following tutorial will show some (four) ways in which you can import your Java projects to your Eclipse workbench. Introduction While learning Java can be done with…
Viewers will learn one way to get user input in Java. Introduce the Scanner object: Declare the variable that stores the user input: An example prompting the user for input: Methods you need to invoke in order to properly get  user input:
Viewers will learn how to properly install Eclipse with the necessary JDK, and will take a look at an introductory Java program. Download Eclipse installation zip file: Extract files from zip file: Download and install JDK 8: Open Eclipse and …
Suggested Courses
Course of the Month15 days, 11 hours left to enroll

580 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question