Let's say I have the following class hierarchy:
interface Collection<E>
{
Collection<E> $plus(E element)
}
interface MutableCollection<E> extends Collection<E>
{
@Override
MutableCollection<E> $plus(E element)
}
interface Set<E> extends Collection<E>
{
@Override
Set<E> $plus(E element)
}
interface MutableSet<E> extends Set<E>, MutableCollection<E>
{
@Override
default MutableSet<E> $plus(E element)
{
// ... implementation
}
}
abstract class AbstractArraySet<E> implements Set<E>
{
// ... no $plus(...) implementation
}
class ArraySet<E> extends AbstractArraySet<E> implements MutableSet<E>
{
// ... no $plus(...) implementation
}
As you can see, only the MutableSet class provides an implementation for the $plus method. In a Test case, I am calling this method on an instance of type ArraySet. The Test always passes in the CI environment, while it always fails with an AbstractMethodError on my local environment. In both cases, I am using Gradle (2.7).
The Error:
java.lang.AbstractMethodError: Method dyvil/collection/mutable/ArraySet.$plus(Ljava/lang/Object;)Ldyvil/collection/Collection; is abstract
at dyvil.collection.mutable.ArraySet.$plus(ArraySet.java)
at dyvil.tests.CollectionTests.testCollection(CollectionTests.java:99)
at ...
Test Code:
testCollection(new ArraySet());
public void testCollection(Collection collection)
{
assertEquals(mutable.$plus("newElement"), collection.$plus("newElement"));
}
java -version output:
CI (where it works):
java version "1.8.0" Java(TM) SE Runtime Environment (build 1.8.0-b132) Java HotSpot(TM) 64-Bit Server VM (build 25.0-b70, mixed mode)Local (where it fails):
java version "1.8.0_71" Java(TM) SE Runtime Environment (build 1.8.0_71-b15) Java HotSpot(TM) 64-Bit Server VM (build 25.71-b15, mixed mode)
I am expecting this to be some sort of javac bug, where the compiler fails to add all required bridge methods (the code compiles without any warnings or errors). In IntelliJ IDEA, the problem occurs both using javac and the Eclipse Compiler.
