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https://issues.apache.org/jira/browse/GROOVY-10972?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Milles reopened GROOVY-10972:
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> Issue in resolving overloaded method reference
> ----------------------------------------------
>
> Key: GROOVY-10972
> URL: https://issues.apache.org/jira/browse/GROOVY-10972
> Project: Groovy
> Issue Type: Bug
> Components: Static Type Checker
> Reporter: Thodoris Sotiropoulos
> Assignee: Eric Milles
> Priority: Major
> Fix For: 4.0.11
>
>
> I have the following program
> {code}
> import java.util.function.Function;
> import java.util.LinkedList;
> class Foo {}
> class Test {
> public static void main(String[] args) {
> LinkedList<Foo> x = new LinkedList();
> x.add(new Foo());
> Function<Integer, Foo> z = x::remove;
> Foo k = z.apply(0); // ClassCastException boolean cannot be cast to
> Foo.
> }
> }
> {code}
> h3. Actual behavior
> The compiler accepts the code, but the following exception is triggered at
> runtime.
> {code}
> Exception in thread "main"
> org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast
> object 'false' with class 'java.lang.Boolean' to class 'Foo'
> at
> org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnSAM(DefaultTypeTransformation.java:425)
> at
> org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnNumber(DefaultTypeTransformation.java:336)
> at
> org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.castToType(DefaultTypeTransformation.java:256)
> at
> org.codehaus.groovy.vmplugin.v8.IndyInterface.fromCache(IndyInterface.java:321)
> at Test.main(test.groovy:14)
> {code}
> There problem happens because there are two overloaded methods inside
> LinkedList:
> * E remove(int x)
> * boolean remove(Object d)
> The compiler seems to resolve the second method (i.e., boolean remove
> (Object)) although its return type does not match with Function<Integer, Foo>.
> Based only on the argument type, both methods are applicable. If the second
> "remove" method is more specific than the first one, then a compiler error
> should be raised at compile-time, because boolean does not match Foo. If this
> is not the case, then the program should call the first "remove" method.
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