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I am getting a NoClassDefFoundError when I run my Java application. What is typically the cause of this?

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The reason behind this error is that when there is a class file that your code depends on and it is present at compile time but not detected at runtime. Look for discrepancies in your build time and runtime classpaths.

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Here are some possible solutions:

  • The class is not accessible in Java Classpath.

  • If you are operating in a J2EE environment than the clarity of Class among various Classloader can also produce java.lang.NoClassDefFoundError, see examples and synopses section for detailed discussion.

  • Review for java.lang.ExceptionInInitializerError in your log file. NoClassDefFoundError due to the breakdown of static initialization is very familiar.

  • Because NoClassDefFoundError is a subclass of java.lang.LinkageError can also occur if one of its yoke like a native library may not accessible.

  • Every start-up script is revoking the Classpath environment variable.

  • You might be working your program using jar command and class wasn't established in the evident file's ClassPath trait.

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