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What should I do if I encounter an NoSuchMethodError or NoClassDefFoundError using WindowBuilder?

April 26, 2017encounter NoClassDefFoundError nosuchmethoderror windowbuilder

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What should I do if I encounter an NoSuchMethodError or NoClassDefFoundError using WindowBuilder?

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Start by checking your Eclipse “.log” file (found in your /.metadata directory). If the error references one of your classes or methods, check that your classpath properly references the class you are trying to use. Also check that your class is properly compiled (no red X’s) and that a .class file exists in your projects /bin directory. A mismatch between the JDK used to compile your code and the JVM used to run Eclipse can also manifest itself as a NoClassDefFoundError problem. For example, if you compile your code using JDK 1.5 or 1.6 and then run your Eclipse using a 1.4 or 1.5 JVM, you can have this problem. If the error refers to a custom widget, you should also check that your component does not trigger an exception during its initialization (which can manifest itself as a NoClassDefFoundError). Try refreshing and cleaning your project using the Project > Clean… or Project > Build Project commands. If that does not help, send a test case to wb-support@instantiations