[GROOVY-9462] Groovy 3 BUG! exception in phase 'conversion' in source unit Caused by NullPointerException

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.2
• Fix Version/s: 4.0.0-alpha-1, 3.0.3, 2.5.15
• Component/s: Compiler
• Assignee: Eric Milles
• Reporter: Puneet Behl
• Created: 12/Mar/20 13:32
• Updated: 27/Aug/21 10:24
• Resolved: 14/Mar/20 06:41

Description

After updating to Groovy 3.0.3-SNAPSHOT we are seeing the following exception:

Caused by: BUG! exception in phase 'conversion' in source unit '~/gorm-neo4j/grails-datastore-gorm-neo4j/src/main/groovy/org/grails/datastore/gorm/neo4j/collection/Neo4jRelationship.groovy' unexpected NullPointerException
 at org.gradle.api.internal.tasks.compile.ApiGroovyCompiler.execute(ApiGroovyCompiler.java:179)
 at org.gradle.api.internal.tasks.compile.ApiGroovyCompiler.execute(ApiGroovyCompiler.java:57)
 at org.gradle.api.internal.tasks.compile.GroovyCompilerFactory$DaemonSideCompiler.execute(GroovyCompilerFactory.java:80)
 at org.gradle.api.internal.tasks.compile.GroovyCompilerFactory$DaemonSideCompiler.execute(GroovyCompilerFactory.java:68)
 at org.gradle.api.internal.tasks.compile.daemon.AbstractDaemonCompiler$CompilerCallable.call(AbstractDaemonCompiler.java:86)
 at org.gradle.api.internal.tasks.compile.daemon.AbstractDaemonCompiler$CompilerCallable.call(AbstractDaemonCompiler.java:74)
 at org.gradle.workers.internal.DefaultWorkerServer.execute(DefaultWorkerServer.java:42)
 at org.gradle.workers.internal.WorkerDaemonServer.execute(WorkerDaemonServer.java:36)
 at org.gradle.process.internal.worker.request.WorkerAction.run(WorkerAction.java:102)
 at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
 at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
 at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:175)
 at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:157)
 at org.gradle.internal.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:404)
 ... 3 more
Caused by: java.lang.NullPointerException
 ... 17 more

I tried to debug the problem and found out that the NullPointerException is caused by JavaStubGenerator.printType method in the following lines:

out.print(type.getGenericsTypes()[0].getName());

In the above code, the ClassNode type is the return type of the getter method getFrom in the class Relationship.groovy where type.getGenericsTypes() is now a null value.

Please clone the following repository and run ./gradlew :grails-datastore-gorm-neo4j:testClasses task to replicate the error:
https://github.com/grails/gorm-neo4j/tree/groovy3

Issue Links

• links to: GitHub Pull Request #1188