-proceedOnError option (like ECJ) ?

[Leonid Arbuzov]

The JCK rule "Java SE C3.1" (added since JCK8a) covers such options:
"...Executable Output must always throw an exception that identifies a 
compilation error before reaching any part of the source code affected 
by that compilation error"

Regards,
-leonid
The JCK team

On 6/20/2024 8:40 AM, Jonathan Gibbons wrote:
>
> Any such change would have to be in accord with JLS and the TCK ...
>
> -- Jon
>
> On 6/18/24 7:26 AM, Mickael Istria wrote:
>> Hi all,
>>
>> Our team, made of various Eclipse JDT contributors, is currently 
>> looking at allowing Eclipse JDT to directly use Javac instead of ECJ 
>> for Java code parsing and resolution and code generation. The goal is 
>> to keep the higher levels of Eclipse JDT and its ecosystem/plugins 
>> working, and allow to plug a Javac-based backend under the hood as an 
>> alternative.
>> We've already made significant progress on this topic, and despite 
>> various remaining glitches, a proof of concept is already kind of 
>> usable, with all typical IDE features (code analysis, error 
>> reporting, selection, completion, indexing...) provided by javac 
>> backend. We are then confident that this is a viable approach on the 
>> mid to long term.
>> Ongoing work is happening at 
>> https://github.com/eclipse-jdtls/eclipse-jdt-core-incubator
>>
>> While working on it, we've identified some interesting features of 
>> ECJ that are missing in Javac and that would be in our opinion 
>> extremely profitable to IDE integration, but also could be profitable 
>> to other integrations as they can shorten the feedback look 
>> tremendously in some cases.
>> The main feature we're missing from ECJ would be something equivalent 
>> to its `-proceedOnError` flag. Basically, it makes that the compiler, 
>> when it faces a compilation error, replaces the DOM/AST and the 
>> generated code with `throw new 
>> CompilationError(compilationErrorMessage)`. This is extremely 
>> convenient when debugging as it allows to hotswap some 
>> not-yet-complete-but-already-interesting-to-debug code into a running 
>> application.
>> Do you think Javac could some day provide such a feature too? This is 
>> not (yet?) a request for enhancement, at this stage, we're just 
>> evaluating our hopes of getting our integration supporting this 
>> important enough case in the future. If there is no technical reason 
>> why not, then we may investigate contributing it (of course, if 
>> someone wants to implement it in the meantime, don't hesitate in 
>> coding it before us ;)
>>
>> Cheers,
>> -- 
>> Mickael Istria
>> Eclipse IDE <https://www.eclipse.org/eclipseide> developer, for Red 
>> Hat <https://developers.redhat.com/>
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