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https://issues.apache.org/jira/browse/GROOVY-8342?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16645315#comment-16645315
]
Eric Milles commented on GROOVY-8342:
-------------------------------------
This may fix the issue (edit indicated in the 2nd half):
{code:java}
private static GenericsType applyGenericsContext(Map<String, GenericsType>
spec, GenericsType gt) {
if (gt.isPlaceholder()) {
String name = gt.getName();
GenericsType specType = spec.get(name);
if (specType!=null) return specType;
if (hasNonTrivialBounds(gt)) {
GenericsType newGT = new GenericsType(gt.getType(),
applyGenericsContext(spec, gt.getUpperBounds()), applyGenericsContext(spec,
gt.getLowerBound()));
newGT.setPlaceholder(true);
return newGT;
}
return gt;
} else if (gt.isWildcard()) {
GenericsType newGT = new GenericsType(gt.getType(),
applyGenericsContext(spec, gt.getUpperBounds()), applyGenericsContext(spec,
gt.getLowerBound()));
newGT.setWildcard(true);
return newGT;
}
ClassNode type = gt.getType();
/* GRECLIPSE edit
if (type.getGenericsTypes()==null) return gt;
ClassNode newType = type.getPlainNodeReference();
newType.setGenericsPlaceHolder(type.isGenericsPlaceHolder());
newType.setGenericsTypes(applyGenericsContext(spec,
type.getGenericsTypes()));
*/
ClassNode newType;
if (type.isArray()) {
newType = applyGenericsContext(spec,
type.getComponentType()).makeArray();
} else {
if (type.getGenericsTypes()==null) return gt;
newType = type.getPlainNodeReference();
newType.setGenericsPlaceHolder(type.isGenericsPlaceHolder());
newType.setGenericsTypes(applyGenericsContext(spec,
type.getGenericsTypes()));
}
GenericsType newGT = new GenericsType(newType);
return newGT;
}
{code}
> Static compilation error with a method returning an array in a type parameter
> -----------------------------------------------------------------------------
>
> Key: GROOVY-8342
> URL: https://issues.apache.org/jira/browse/GROOVY-8342
> Project: Groovy
> Issue Type: Bug
> Components: Static compilation
> Reporter: M. Justin
> Priority: Major
>
> A compilation error occurs when using static compilation and attempting to
> assign the result of a method that returns a parameterized argument that
> contains an array in the type parameter. The equivalent Java code has no
> issues.
> Here is a specific example:
> {code}@CompileStatic
> class ArrayGenericsIssue {
> static void main(String[] args) {
> Optional<Integer[]> value = testArrayMethod(1) //This fails to compile
> }
> static <E> Optional<E[]> testArrayMethod(E ignored) {
> return Optional.empty()
> }
> }{code}
> The error returned is:
> {code}Error:(11, 33) Groovyc: [Static type checking] - Incompatible generic
> argument types. Cannot assign java.util.Optional <E[]> to: java.util.Optional
> <Integer[]>{code}
> The expected behavior is that this code would compile and run successfully
> with @CompileStatic enabled.
> Note that equivalent code with a non-array generic parameter works just fine:
> {code}
> static void main(String[] args) {
> Optional<List<Integer>> value = testListMethod(1)
> }
> static <E> Optional<List<E>> testListMethod(E ignored) {
> return Optional.empty()
> }
> {code}
> Additionally, there is no compilation issue if the value is cast:
> {code}Optional<Integer[]> value = (Optional<Integer[]>)
> testArrayMethod(1){code}
> For some context, I'm running into this issue when working with
> [jOOQ|https://www.jooq.org/], as some of its API involves working with array
> type parameters.
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