Christopher Smith created GROOVY-10761:
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Summary: MethodNode won't accept ClassNode with generics as return
type
Key: GROOVY-10761
URL: https://issues.apache.org/jira/browse/GROOVY-10761
Project: Groovy
Issue Type: Bug
Components: Compiler
Affects Versions: 4.0.5
Reporter: Christopher Smith
This is likely a case of "there's a specific idiomatic way to make this work",
but the overall API documentation suggests that this case _should_ work. I have
a base class with a generic property:
{code}
class Base<M> {
M meta
}
{code}
In an ASTT, I attempt to create this derived class:
{code}
class Derived extends Base<Map<String, Object>> {
final Map<String, Object> getMeta() { super.getMeta() }
final void setMeta(Map<String, Object> value) { super.setMeta(value) }
}
{code}
I am trying to create the {{getMeta}} method as follows:
{code}
derivedCn.addMethod(new MethodNode(
'getMeta',
PUBLIC | FINAL,
makeClassSafeWithGenerics(makeWithoutCaching(Map),
STRING_TYPE.asGenericsType(), OBJECT_TYPE.asGenericsType()),
Parameter.EMPTY_ARRAY,
ClassNode.EMPTY_ARRAY,
returnS(callSuperX(name))
))
{code}
In particular, I'm following the "official" format for creating a {{ClassNode}}
representing {{Map<String, Object>}}. However, I still receive the compiler
error
{code}
A transform used a generics containing ClassNode
java.util.Map<java.lang.String, java.lang.Object> for the method public final
java.util.Map<java.lang.String, java.lang.Object> getMeta() { ... } directly.
You are not supposed to do this. Please create a new ClassNode referring to the
old ClassNode and use the new ClassNode instead of the old one. Otherwise the
compiler will create wrong descriptors and a potential NullPointerException in
TypeResolver in the OpenJDK. If this is not your own doing, please report this
bug to the writer of the transform.
{code}
I observe that {{MethodNode}} defines a property {{genericsTypes}}, but in this
case the method itself is not generic, it simply has a (non-generic) return
type that is itself generic.
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