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What should I do if I encounter an UnsupportedClassVersionError using Designer?

April 26, 2017Designer encounter unsupportedclassversionerror

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What should I do if I encounter an UnsupportedClassVersionError using Designer?

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An UnsupportedClassVersionError is usually caused by attempting to run code compiled against a later JRE with an IDE using an earlier JRE. Typically, you will see this when trying to use a class (such as a custom widget) that has been compiled against JDK 1.5 within a version of Eclipse launched with JDK 1.4.