Fwd: Re: Compilation error with JDK9-ea+138

[Jonathan Gibbons]

Christian,

Since the output does not look like a standard message from javac, I 
have to ask, what compiler are you using?

-- Jon


On 10/6/16 8:53 AM, Christian Beikov wrote:
> I am having trouble to create a small example that shows the problem too.
> Since the project is open source you can try that yourselves on that 
> project.
>
> URL: https://github.com/Blazebit/blaze-persistence.git
>
> export MAVEN_OPTS="--add-modules=java.se.ee"
> mvn -pl jpa-criteria/impl -am clean compile
>
> Then you will get the error message:
> BlazeCriteriaBuilderImpl.java:[997,48] error: incompatible types: 
> SimpleCase<CAP#1,R> cannot be converted to SimpleCase<C,R>
>
> Regards,
> Christian
>
> Am 06.10.2016 um 17:30 schrieb Maurizio Cimadamore:
>>
>> What Jon says. I;ve tried to give this a try using this example:
>>
>> class Test {
>>
>> interface Expression<T> { }
>>
>> interface SimpleCase<A, B> { }
>>
>> <C, R> SimpleCase<C, R> selectCase(Expression<? extends C> expression) {
>>           return selectCase((Class<R>) null, expression);
>> }
>>
>> <C, R> SimpleCase<C, R> selectCase(Class<R> type, Expression<? 
>> extends C> expression) {
>>           return null;
>>       }
>> }
>>
>>
>> But this passes with latest compiler. So I'm probably missing 
>> something (i.e. some bounds in the type-variable decl for Expression 
>> or SimpleCase?)
>>
>> Maurizio
>>
>>
>> On 06/10/16 16:17, Jonathan Gibbons wrote:
>>>
>>> Christian,
>>>
>>> As a general rule, it is better if you can post complete but reduced 
>>> test cases, and post all the messages from the compiler. It is often 
>>> hard to properly diagnose cases where someone posts some fragment of 
>>> code and asks what's wrong.
>>>
>>> -- Jon
>>>
>>>
>>> On 10/6/16 8:08 AM, Christian Beikov wrote:
>>>>
>>>> I have been directed to this mailing list for this error.
>>>>
>>>> Is this a known issue?
>>>>
>>>>
>>>>
>>>> -------- Weitergeleitete Nachricht --------
>>>> Betreff: 	Re: Compilation error with JDK9-ea+138
>>>> Datum: 	Wed, 05 Oct 2016 10:27:53 -0700
>>>> Von: 	Alex Buckley <alex.buckley at oracle.com>
>>>> Organisation: 	Oracle Corporation
>>>> An: 	jigsaw-dev at openjdk.java.net
>>>>
>>>>
>>>>
>>>> This isn't a Jigsaw issue, please mail compiler-dev instead, being sure
>>>> to note which JDK 9 build you are compiling with.
>>>>
>>>> On 10/5/2016 12:55 AM, Christian Beikov wrote:
>>>> > The following used to compile just fine on JDKs < 9
>>>> >
>>>> >      @Override
>>>> >      public <C, R> SimpleCase<C, R> selectCase(Expression<? extends C>
>>>> > expression) {
>>>> >          return selectCase((Class<R>) null, expression);
>>>> >      }
>>>> >
>>>> >      public <C, R> SimpleCase<C, R> selectCase(Class<R> type,
>>>> > Expression<? extends C> expression) {
>>>> >          return new SimpleCaseExpression<C, R>(this, type, expression);
>>>> >      }
>>>> >
>>>> > but now fails with:
>>>> >      error: incompatible types: SimpleCase<CAP#1,R> cannot be converted
>>>> > to SimpleCase<C,R>
>>>> >
>>>> > The error is in the first selectCase method.
>>>> >
>>>> > Is that a bug in the compiler?
>>>> >
>>>> > Regards,
>>>> > Christian
>>>
>>
>

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