java.lang.ExceptionInInitializerError with Java-16 | j.l.ClassFormatError accessible: module java.base does not “opens java.lang” to unnamed module

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Since JDK 16, the default for the --illegal-access option is deny, so “deep reflection” to JDK classes fails.

You can override the behavior by specifying --illegal-access=permit, but you have to be aware of JEP 403: Strongly Encapsulate JDK Internals which is about closing that possibility in a future version, so this option is only a temporary solution.

The permanent solution is to update cglib to a compatible version if/once it exists. The attempt to access ClassLoader.defineClass suggests that the library wants to add classes to a particular context, which can be done via MethodHandles.lookup().defineClass instead (since Java 9). So the code only has to switch to the new way of adding classes.

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