KeyCloak Server Caused by: java.lang.ClassNotFoundException: java.security.acl.Group

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After some research I found the answer to my problem.

The problem is that java.security.acl.Group is being deprecated since JRE 9 and marked for removal in future versions.

java.security.acl.Group is being replaced by java.security.Policy

I was running my Spring-Boot application on JRE 14 in which this class appeared to be no longer available.

So once I changed my Spring-boot application (which hosts the REST-API) to use JRE 11 the error went away.

Note: The pom.xml Java version attibute <java.version>11</java.version> needed to change as well as the JDK in the build path in Eclipse (which is the IDE I’m using) JDK Buildpath

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