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.

See also  10 Best Apps to Help You Read More Books in Less Time

About Our Editorial Process

At DevX, we’re dedicated to tech entrepreneurship. Our team closely follows industry shifts, new products, AI breakthroughs, technology trends, and funding announcements. Articles undergo thorough editing to ensure accuracy and clarity, reflecting DevX’s style and supporting entrepreneurs in the tech sphere.

See our full editorial policy.

About Our Journalist