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

[Christian Beikov]

I am using javac through maven-compiler-plugin, but since I posted the 
instructions you can try to invoke that yourself and see with your own 
eyes. I don't know if maven post-processes the compiler messages, but 
according the output, it says javac is used.


Regards,
Christian

Am 06.10.2016 um 18:11 schrieb 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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