Daniel Sun created GROOVY-11292:
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Summary: Class without sealed parent cannot be non-sealed
Key: GROOVY-11292
URL: https://issues.apache.org/jira/browse/GROOVY-11292
Project: Groovy
Issue Type: Improvement
Reporter: Daniel Sun
Java 21 has more strict check for {{non-sealed}} classes, i.e. class cannot be
non-sealed if it has no sealed parent. We have to align with check rule of Java
21, and declare class {{non-sealed}} by default if and only if it has
{{sealed}} parent.
Before the proposed improvement, {{TestReference}} will be declared
{{non-sealed}} by default, but its parent {{SoftReference}} is {{non-sealed}}
and {{SoftReference}}'s parent {{Reference}} is {{sealed}}, so Java 21 will
emit the following error:
{code:java}
startup failed:
/home/daniel/IdeaProjects/groovy/src/test/org/codehaus/groovy/util/ReferenceManagerTest.groovy:
147: The class 'org.codehaus.groovy.util.ReferenceManagerTest$TestReference'
cannot be non-sealed as it has no sealed parent.
@ line 147, column 13.
private class TestReference<T>
^
1 error
> Task :compileTestGroovy FAILED
{code}
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