'IllegalAccessError: ClassA and class B are in unnamed module of loader 'app'

I have a spring @Configuration bean which initializes a class A. This class A, in its constructor, calls another static method in class B. When spring initializes class A it eventually fails with java.lang.IllegalAccessError: class A tried to access method in class B (class A and classB are in unnamed module of loader 'app')

The class A and B are in present in different libraries, and I don't get any compilation issue at all.

Java version is 11, and the app uses spring boot 2.3.4-RELEASE.

I tried searching for answers but seem to find nothing on it. Can somebody please assist here?

javaspringspring-boot


Solution 1:[1]

Adding the following to the module-info.java did the trick for me:

requires spring.core;
requires spring.beans;
requires java.instrument;

Solution 2:[2]

Class B is loaded by a jar which is coming as a transitive dependency to the project. Added the jar, which has class B, as a direct dependency solved the issue.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Vincz777
Solution 2 Raj V

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