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https://issues.apache.org/jira/browse/GROOVY-10201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17470073#comment-17470073
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Peter Burka commented on GROOVY-10201:
--------------------------------------
I attempted to backport some of these changes into the 3.x branch, but ran into
build problems (wrote to mailing list but no response). Has there been any more
discussion about how to support Java 17 (which, since September, is the current
LTS Java version)?
> JDK 17: class String1_groovyProxy cannot implement sealed interface
> java.lang.constant.ConstantDesc
> ---------------------------------------------------------------------------------------------------
>
> Key: GROOVY-10201
> URL: https://issues.apache.org/jira/browse/GROOVY-10201
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 3.0.9
> Reporter: Peter Burka
> Priority: Major
>
> Doing early testing of some Groovy applications on Java 17 (ea31), and I'm
> encountering some exceptions like the following in unit tests. I'm testing on
> the 3.0.9 branch since 3.0.8 can't compile many of our Groovy classes against
> Java 17.
> {code:java}
> java.lang.IncompatibleClassChangeError: class String1_groovyProxy cannot
> implement sealed interface java.lang.constant.ConstantDesc
> java.base/java.lang.ClassLoader.defineClass1(Native Method)
> java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1012)
> java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:874)
>
> org.codehaus.groovy.runtime.ProxyGeneratorAdapter$InnerLoader.defineClass(ProxyGeneratorAdapter.java:847)
>
> org.codehaus.groovy.runtime.ProxyGeneratorAdapter.<init>(ProxyGeneratorAdapter.java:192)
>
> groovy.util.ProxyGenerator.lambda$createAdapter$0(ProxyGenerator.java:234)
>
> org.apache.groovy.util.concurrent.concurrentlinkedhashmap.ConcurrentLinkedHashMap.lambda$compute$0(ConcurrentLinkedHashMap.java:788)
>
> java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1708)
>
> org.apache.groovy.util.concurrent.concurrentlinkedhashmap.ConcurrentLinkedHashMap.compute(ConcurrentLinkedHashMap.java:800)
>
> org.apache.groovy.util.concurrent.concurrentlinkedhashmap.ConcurrentLinkedHashMap.computeIfAbsent(ConcurrentLinkedHashMap.java:777)
>
> org.codehaus.groovy.runtime.memoize.LRUCache.getAndPut(LRUCache.java:63)
> groovy.util.ProxyGenerator.createAdapter(ProxyGenerator.java:230)
>
> groovy.util.ProxyGenerator.instantiateDelegateWithBaseClass(ProxyGenerator.java:205)
>
> groovy.util.ProxyGenerator.instantiateDelegateWithBaseClass(ProxyGenerator.java:189)
> groovy.util.ProxyGenerator.instantiateDelegate(ProxyGenerator.java:181)
> groovy.util.ProxyGenerator.instantiateDelegate(ProxyGenerator.java:177)
>
> org.codehaus.groovy.runtime.DefaultGroovyMethods.asType(DefaultGroovyMethods.java:17910)
>
> org.codehaus.groovy.runtime.StringGroovyMethods.asType(StringGroovyMethods.java:208)
> org.codehaus.groovy.runtime.dgm$1158.doMethodInvoke(Unknown Source)
> groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1268)
> {code}
> I haven't tried to create a simple reproducer, but am happy to try to do so
> if the problem isn't already known or obvious.
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