[GROOVY-11389] Groovy @Delegate issue with Java 21

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 4.0.21
• Component/s: Compiler

Language

groovy

• Assignee: Unassigned
• Reporter: paolo di tommaso
• Created: 29/May/24 15:47
• Updated: 20/Jun/24 16:52

Description

Context: Java 21 introduces a new interface SequencedCollection
as super-interface for `List` and other interfaces.

This causes an issue in Groovy when the following conditions are met:
1. Using a `@Delegate List someAttribute` in a class
2. Compile with Java 21
3. Run with Java 20 or earlier the resulting app.

Replicate the issue
 
0. Clone this repository 

   https://github.com/pditommaso/groovy-java21-poc
 
1. Compile and run
 

./gradlew run 

Output:

Runtime: Groovy 4.0.21 on OpenJDK 64-Bit Server VM 21.0.3+9-LTS
Plain list sub-class: [1, 2, 3]
Delegate list class : [1, 2, 3] 

2. Setup Java 11

sdk use java 11.0.14-zulu 

3. Run the app with Java 11

bash run.sh 

Output:

Runtime: Groovy 4.0.21 on OpenJDK 64-Bit Server VM 11.0.14+9-LTS
Plain list sub-class: [1, 2, 3]
Exception in thread "main" java.lang.NoClassDefFoundError: java/util/SequencedCollection
at org.example.App.run(App.groovy:18)
at org.example.App.main(App.groovy:22)
Caused by: java.lang.ClassNotFoundException: java.util.SequencedCollection
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
... 2 more