What does it mean when I receive the Java:java.lang.ClassFormatError?I get it whenever I try to implement a ready-made Javaapplication onto my Web site.

The ClassFormatError is thrown whenever the class loader determines thefile is malformed or cannot be interpreted as a class file.

I noticed you used the word “application” when describing your Javaprogram. Of course to run under a browser, a Java program must extend theclass Applet and provide an init() method.

Other common reasons for this error are:

  • Forgot to compile the .java file into a .class file
  • ftp’d the .class file as a text file
  • Specified the .java file instead of the .class file in the HTMLAPPLET tag.

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