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https://issues.apache.org/jira/browse/GROOVY-12089?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King reassigned GROOVY-12089:
----------------------------------
Assignee: Paul King
> Groovy 5 ClassNode.getGetterMethod() can clone a getter with a null
> exceptions array when @Entity and @Sortable are combined
> ----------------------------------------------------------------------------------------------------------------------------
>
> Key: GROOVY-12089
> URL: https://issues.apache.org/jira/browse/GROOVY-12089
> Project: Groovy
> Issue Type: Bug
> Components: AST Transforms
> Affects Versions: 5.0.6
> Reporter: Mattias Reichel
> Assignee: Paul King
> Priority: Major
>
> With Groovy 5, a Grails domain class annotated with both {{@Entity}} and
> {{@Sortable}} can fail during canonicalization with:
> {code:java}
> BUG! exception in phase 'canonicalization' in source unit '...' unexpected
> NullPointerException
> Caused by: java.lang.NullPointerException: Cannot read the array length
> because "<local3>" is null
> at
> org.codehaus.groovy.classgen.VariableScopeVisitor.visitConstructorOrMethod(...)
> at
> org.codehaus.groovy.transform.SortableASTTransformation.createSortable(...){code}
> A minimal reproducer is:
> {code:java}
> import grails.persistence.Entity
> import groovy.transform.Sortable
> @Entity
> @Sortable(includes = ['a'])
> class Repro {
> String a
> }{code}
> {{@Sortable}} by itself compiles, and {{@Entity}} by itself compiles. The
> failure only appears when they are combined.
> According to GPT, the Groovy-side branch that introduces the null exceptions
> array is in
> {{{}org.codehaus.groovy.ast.ClassNode#getGetterMethod(String){}}},
> specifically the default-argument getter synthesis branch:
> {code:java}
> } else if (method.hasDefaultValue() &&
> Stream.of(method.getParameters()).allMatch(Parameter::hasInitialExpression)) {
> // GROOVY-11380: getter generated later by default arguments
> if (isNullOrSynthetic.test(getterMethod)) {
> getterMethod = new MethodNode(method.getName(), method.getModifiers()
> & ~ACC_ABSTRACT, method.getReturnType(), Parameter.EMPTY_ARRAY,
> method.getExceptions(), null);
> getterMethod.setSynthetic(true);
> getterMethod.setDeclaringClass(this);
> getterMethod.addAnnotations(method.getAnnotations());
> AnnotatedNodeUtils.markAsGenerated(this, getterMethod);
> getterMethod.setGenericsTypes(method.getGenericsTypes());
> }
> }
> {code}
> If the source method carries a null exceptions array, that null is preserved
> on the synthesized getter and later blows up in
> {{{}VariableScopeVisitor.visitConstructorOrMethod(...){}}}.
> I can also add, that historically, Grails often created methods in AST with a
> null exceptions parameter. With Groovy 5 this blew up in the same way. We
> have therefore changed to consistently pass ClassNode.EMPTY_ARRAY to remedy
> that situation. However, it feels like there should be a guard on the Groovy
> side for this instead of blowing up.
>
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