Solved

ClassFormatError

Posted on 1998-08-24
3
153 Views
Last Modified: 2011-10-03
What's the reason for the following error message of the Navigator?

# Applet debug level set to 9
# stopApplet: contextID=2 appletID=13800992 parentMWContext=13682640
# Stopping applet: pm, appletID=13800992, contextID=2
# destroyApplet: contextID=2 appletID=13800992
# Destroying applet: pm, appletID=13800992, contextID=2
#     total applets=1
#   destroying context for contextID 2
# Destroying applet context: http://Storm/Pm/pm.html, contextID=2
# Destroying AppletFrame without disposing: netscape.applet.DerivedAppletFrame[frame2,0,0,850x300,hidden,layout=java.awt.BorderLayout,resizable,title=]
#   frameMWContext=13682640
# Destroying all applets: http://Storm/Pm/pm.html, contextID=2
# initApplet: contextID=2 appletID=13771952 parentContext=13682640 frameContext=13682640
# New applet context: http://Storm/Pm/pm.html, contextID=2
# Initializing applet: pm.class, appletID=13771952, contextID=2
#   docURL=http://Storm/Pm/pm.html reloadClasses=true
#     total applets=2
#     New applet: 13771952 at http://Storm/Pm/ width=850 height=300 hspace=0 vspace=0 align=baseline codebase=http://Storm/Pm/ code=pm.class
# startApplet: contextID=2 appletID=13771952 newFrameMWContext=13682640
# Starting applet: pm, appletID=13771952, contextID=2
#   preventing reuse of netscape.applet.AppletClassLoader@800cda6
#   new class loader netscape.applet.AppletClassLoader@8008b86
#      context = netscape.applet.MozillaAppletContext@800d660
#      codebase = http://Storm/Pm/
# Loading class pm
# Fetching http://Storm/Pm/pm.class
# Destroying AppletFrame without disposing: netscape.applet.DerivedAppletFrame[frame2,0,0,850x300,hidden,layout=java.awt.BorderLayout,resizable,title=]
# Applet exception: error: java.lang.ClassFormatError: Wrong class name inside class file
java.lang.ClassFormatError: Wrong class name inside class file
  at java.lang.ClassLoader.defineClass(Compiled Code)
  at netscape.applet.AppletClassLoader.loadClass(Compiled Code)
  at netscape.applet.AppletClassLoader.findClass(Compiled Code)
  at netscape.applet.AppletClassLoader.loadClass1(Compiled Code)
* at netscape.applet.AppletClassLoader.loadClass(Compiled Code)
  at netscape.applet.AppletClassLoader.loadClass(Compiled Code)
  at netscape.applet.DerivedAppletFrame$LoadAppletEvent.dispatch(Compiled Code)
  at java.awt.EventDispatchThread$EventPump.dispatchEvents(Compiled Code)
  at java.awt.EventDispatchThread.run(Compiled Code)
  at netscape.applet.DerivedAppletFrame$AppletEventDispatchThread.run(Compiled Code)

Using JBuilder 2 and the AppletViewer the program runs well.
Maybe it's important that I have all class files in a directory called "pm" since all the files of the program should belong to the package pm.
0
Comment
Question by:dirku
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 

Author Comment

by:dirku
ID: 1222437
Edited text of question
0
 
LVL 8

Accepted Solution

by:
diakov earned 20 total points
ID: 1222438
- Carefully check the upper-lower case of the names of the files. Usually the local file system is case insensitive, but the web servers are. Especially when they run UNIX. When moving, copying, etc, check the file names with a good program. For example the command prompt with settings to show the case, or Windows Explorer.
- The package structure is similar to a directory structure. The subpackages has to be in the corresponding directories. This is how the loader finds them.
0
 

Author Comment

by:dirku
ID: 1222439
Silly mistake! I really needed to change CODE="pm/pm.class" to CODE="pm/PM.class" ...


0

Featured Post

On Demand Webinar - Networking for the Cloud Era

This webinar discusses:
-Common barriers companies experience when moving to the cloud
-How SD-WAN changes the way we look at networks
-Best practices customers should employ moving forward with cloud migration
-What happens behind the scenes of SteelConnect’s one-click button

Question has a verified solution.

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

By the end of 1980s, object oriented programming using languages like C++, Simula69 and ObjectPascal gained momentum. It looked like programmers finally found the perfect language. C++ successfully combined the object oriented principles of Simula w…
In this post we will learn how to make Android Gesture Tutorial and give different functionality whenever a user Touch or Scroll android screen.
Viewers learn how to read error messages and identify possible mistakes that could cause hours of frustration. Coding is as much about debugging your code as it is about writing it. Define Error Message: Line Numbers: Type of Error: Break Down…
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 …

695 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