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Home/ Questions/Q 4115750
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Editorial Team
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Editorial Team
Asked: May 20, 20262026-05-20T22:37:20+00:00 2026-05-20T22:37:20+00:00

In my own classloader I get all entries from jar file and use defineClass()

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In my own classloader I get all entries from jar file and use defineClass() to load classes to memory.

My problem is that if jar has inner classes (e.g. MyClass$1.class) the defineClass method fails with java.lang.NoClassDefFoundError: IllegalName exception.

Obviously java needs all files from jar to make it work but how the inner classes can be loaded?

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  1. Editorial Team
    Editorial Team
    2026-05-20T22:37:20+00:00Added an answer on May 20, 2026 at 10:37 pm

    MyClass$1.class should match an anonymous inner class. If your inner class is named, it should be MyClass$InnerClass.class

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