Eclipse vs Javac difference

[Maurizio Cimadamore]

Here's a reduced test case:

import java.util.*;

interface BooleanList extends List<Boolean>, BooleanCollection { }

interface BooleanCollection extends Collection<Boolean> {
    BooleanIterator iterator();
}

interface BooleanIterator extends Iterator<Boolean> { }

class Test {
    void test(BooleanList plist) {
         BooleanIterator it = plist.iterator();
    }
}

This is a duplicate of the following bug:

http://bugs.sun.com/view_bug.do?bug_id=6487370

Which is fixed in JDK 7.

Maurizio

On 27/08/10 10:06, Stephen Colebourne wrote:
> That sounds similar to the problem Benedict - one method inherited
> from two interfaces, one with a generic definition Iterator<T>  and one
> with an extension of that BooleanIterator. I assume the convariant
> return type isn't picked up after the erasure occurs.
>
> I have limited internet connection, so can't search the bug database
> to find the reference. This will be very difficult to work around I
> suspect.
>
> Stephen
>
>
> On 27 August 2010 08:39, Benedict Elliott Smith<lists at laerad.com>  wrote:
>    
>> This is something that bit me once - if you implement two
>> methods from different interfaces with the same erasure, the JDK6 compiler
>> barfs. It has definitely been fixed, but I think only in JDK7.
>>
>>
>> On 27 August 2010 01:11, Jonathan Gibbons<jonathan.gibbons at oracle.com>
>> wrote:
>>      
>>> Stephen,
>>>
>>> Have you tried versions of JDK, such as OpenJDK 6 or OpenJDK 7?
>>>
>>> Can you boil the code down to a simple example which illustrates the
>>> different behavior?
>>>
>>> -- Jon
>>>
>>> On 08/26/2010 04:10 PM, Stephen Colebourne wrote:
>>>        
>>>> I'm currently seeing a difference between Eclipse and Javac and am
>>>> trying to determine who is at fault, and how to work around it.
>>>>
>>>> The code in question is at Joda Primitives -
>>>>
>>>> http://joda-primitives.svn.sourceforge.net/viewvc/joda-primitives/trunk/JodaPrimitives/?pathrev=30
>>>>
>>>> Running maven - mvn package - shows the problem (it compiles in
>>>> Eclipse 3.5.0 and not in javac 1.6.0_13-b03)
>>>>
>>>>
>>>> \dev\joda\primitives\src\test\java\org\joda\primitives\list\impl\AbstractTestBooleanList.java:[76,39]
>>>> reference to iterator is ambiguous, both method iterator() in
>>>> org.joda.primitives.collection.BooleanCollection and method iterator()
>>>> in java.util.List<java.lang.Boolean>    match
>>>>
>>>> The code includes an interface BooleanCollection that extends
>>>> interface PrimitiveCollection, which extends Collection<Boolean>. The
>>>> iterator() method is overridden covariantly in BooleanCollection to
>>>> return BooleanIterator, a subinterface of PrimitiveIterator<Boolean>
>>>> and Iterator<Boolean>.
>>>>
>>>> Any ideas? The svn repo is available to view (Apache 2 license).
>>>> Stephen
>>>>
>>>>          
>>>        
>>
>>      

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