I'm trying to package a Java library as a JAR. But when whenever I am invoking its methods it throws some random java.lang.IncompatibleClassChangeErrors. How do I debug this?
Well these kinda error generally occur when you alter the library codes without recompiling the client code. So, you should try recompiling the client code against the new library. I guess this might solve your issue. For more details, you can refer here: Java Language Specification §13.
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