New to Java

• I got this from https://github.com/apache/shardingsphere-elasticjob/pull/2431 .
• I found that for JDK8 to JDK20, the following unit test will print `org.apache.shardingsphere.elasticjob.kernel.internal.setup.DefaultJobClassNameProviderTest$$Lambda$369/0x00007f56700af6d0`.

import org.junit.jupiter.api.Test;

public class LambdaTest {
    @Test
    void test() {
        Runnable runnable = () -> System.out.println("Aloha World!");
        System.out.println(runnable.getClass().getName());
    }
}

• But starting from JDK21, this unit test prints `org.apache.shardingsphere.elasticjob.kernel.internal.setup.LambdaTest$$Lambda/0x00007f04bc0ad7d8`.
• One difference this makes is that I can no longer use `$$Lambda$` to match it.
• I can only see similar changes on the GraalVM side at https://github.com/oracle/graal/pull/7775 , but there is no indication of which JEP this was introduced in. Is there any direct JDK21 documentation that explains this change?