Re: GWTC 2.9.0 has problems compiling my generics

Interestingly, I've run into exactly the same issue yesterday, but other way
around: my code compiles in GWT 2.9 (and javac and Eclipse), but not in GWT
2.8.2 which refuses to accept parameters for one method with generics-heavy
signature.

I've even explored the possibility to force GWT 2.8.2 to use newer ecj, but
it's bundled in gwt.dev.jar.

Any help is appreciated.

-gkresic.


On 29. 05. 2020. 14:07, David Nouls wrote:
> I switched from GWT 2.8.2 to GWT 2.9.0 and I get some GWTC compilation
> errors when compiling with certain generic constructs.
> It compiles fine with JDK11 and in IntelliJ, but GWTC no longer seems to
> support this:
>
> [INFO] --- gwt-maven-plugin:1.0.0:compile (default-compile) @
> cloud.platform.ui.demo-app ---
> [INFO] Compiling module com.swift.cloud.platform.ui.demo.Demo
> [INFO]    Tracing compile failure path for type
> 'com.swift.cloud.platform.ui.webcomponent.widget.query.QueryEditor'
> [INFO]       [ERROR] Errors in
> 'jar:file:/home/dnouls/liteevolutiontfr/platform/main/ui/webcomponent/target/cloud.platform.ui.webcomponent-0.0.5-SNAPSHOT.jar!/com/swift/cloud/platform/ui/webcomponent/widget/query/QueryEditor.java'
> [INFO]          [ERROR] Line 376: The method byKey(IFilterKey<KEY>) in the
> type QueryConfiguration is not applicable for the arguments (capture#67-of ?
> extends IFilterKey<?>)
> [INFO]    [ERROR] Aborting compile due to errors in some input files
>
>
> A small piece of the QueryEditor class where this error is reported:
>
>   public void setFilterKeys(Set<? extends IFilterKey<?>> filterKeys) {
>     this.allowedFilterKeys = filterKeys.stream().filter(key ->
> config.byKey(key).isPresent()).collect(Collectors.toCollection(ArrayList::new));
>
>     // sort by label
>
> allowedFilterKeys.sort(Comparator.comparing(config.getLabels()::getKeyLabel));
>   }
>
> This is the method that it is trying to call:
>   @SuppressWarnings("unchecked")
>   public <KEY, VO, CONFIG extends AbstractCriteria<KEY, VO, CONFIG>>
> Optional<CONFIG> byKey(IFilterKey<KEY> key) {
>     return Optional.ofNullable((CONFIG) byKey.get(key));
>   }
>
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