Agata Strojewska created GROOVY-8098:
----------------------------------------
Summary: Methods overloading issue
Key: GROOVY-8098
URL: https://issues.apache.org/jira/browse/GROOVY-8098
Project: Groovy
Issue Type: Bug
Reporter: Agata Strojewska
I've created a repository on Github with a simple example showing the problem:
https://github.com/astrojewska/groovy-overloading-issue
There is a base repository interface with generic types:
{code:title=BaseRepository.java|borderStyle=solid}
public interface BaseRepository<T, S extends Serializable> {
void call(T t);
void call(S s);
}
{code}
And the specified:
{code:title=BaseSpecializedRepo.java|borderStyle=solid}
public interface BaseSpecializedRepo extends BaseRepository<Integer, String> {
}
{code}
Then I've created a class that implements BaseRepository<T, S>:
{code:title=InMemoryBaseRepo.java|borderStyle=solid}
public class InMemoryBaseRepo<T, S extends Serializable> implements
BaseRepository<T, S> {
public void call(T t) {
System.out.println("T call");
}
public void call(S s) {
System.out.println("S call");
}
}
{code}
And another class that extends the previous one (in groovy):
{code:title=InMemorySpecializedGroovyRepo.groovy|borderStyle=solid}
class InMemorySpecializedGroovyRepo extends InMemoryBaseRepo<Integer, String>
implements BaseSpecializedRepo {
}
{code}
Now I try to instantiate InMemorySpecializedGroovyRepo:
{code}
BaseSpecializedRepo groovyRepo = new InMemorySpecializedGroovyRepo()
{code}
And call:
{code}
groovyRepo.call(new Integer(0));
groovyRepo.call(new String("empty"));
{code}
At this point always method for <T> generic type is called.
Output:
{code}
### GROOVY ###
T call
T call
// java implementation: BaseSpecializedRepo javaRepo = new
InMemorySpecializedJavaRepo()
### JAVA ###
T call
S call
{code}
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