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https://issues.apache.org/jira/browse/GROOVY-12257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18105031#comment-18105031
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ASF GitHub Bot commented on GROOVY-12257:
-----------------------------------------
paulk-asert merged PR #2788:
URL: https://github.com/apache/groovy/pull/2788
> Groovy 4 @Immutable bytecode fails on Groovy 5 because ObjectUtil was removed
> -----------------------------------------------------------------------------
>
> Key: GROOVY-12257
> URL: https://issues.apache.org/jira/browse/GROOVY-12257
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 5.0.8
> Reporter: Mattias Reichel
> Priority: Major
>
> h3. Summary
> A class compiled with Groovy 4 using @Immutable fails at runtime when
> executed with Groovy 5.
> The Groovy 4 @Immutable AST transformation generates bytecode that calls:
> {code:java}
> org.apache.groovy.runtime.ObjectUtil.cloneObject(Object)
> {code}
> org.apache.groovy.runtime.ObjectUtil is present in Groovy 4 but was removed
> in Groovy 5. Constructing an affected class therefore throws:
> {code:java}
> java.lang.NoClassDefFoundError: org/apache/groovy/runtime/ObjectUtil
> {code}
> h3. Reproducer
> A minimal Gradle reproducer is provided here:
> https://github.com/matrei/groovy-immutable-compat. It compiles the class with
> Groovy 4.0.33 and runs it with Groovy 5.0.8:
> {code:groovy}
> import groovy.transform.Immutable
> @Immutable
> class ImmutableValue {
> List<String> values
> }
> println new ImmutableValue(['value'])
> {code}
> Run:
> {code:bash}
> ./gradlew reproduce
> {code}
> h3. Actual Behaviour
> Compilation succeeds with Groovy 4, but execution with Groovy 5 fails when
> the immutable class is instantiated:
> {code:java}
> java.lang.NoClassDefFoundError: org/apache/groovy/runtime/ObjectUtil
> {code}
> h3. Expected Behaviour
> Groovy 4-compiled @Immutable classes should remain binary-compatible with
> Groovy 5, or the Groovy 5 transformation/runtime should provide a
> compatibility path for the generated bytecode.
> Recompiling the source with Groovy 5 avoids the problem, but this does not
> help users consuming libraries or plugins distributed as Groovy 4-compiled
> binaries.
> h3. Root Cause
> The Groovy 4 @Immutable transformation emits calls to
> ObjectUtil.cloneObject(Object) for defensive copying of properties such as
> collections. The referenced runtime class was removed in Groovy 5:
> {code:java}
> Groovy 4: org/apache/groovy/runtime/ObjectUtil.class is present
> Groovy 5: org/apache/groovy/runtime/ObjectUtil.class is absent
> {code}
> The failure is not detected during dependency resolution or application
> startup. It occurs only when the affected immutable class is instantiated.
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