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Java Language Support for Visual Studio Code
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Annotation processor in project incorrectly yields "[Java] <generated type> cannot be resolved to a type" #682

Open shoffmeister opened 6 years ago

shoffmeister commented 6 years ago

I have access to a specific (large) project here which makes use of

@SupportedAnnotationTypes({"the.namespace.TheAnnotation"})
@SupportedSourceVersion(SourceVersion.RELEASE_10)

to create an annotation processor

public class TheAnnotationProcessor extends AbstractProcessor {

for an annotation the.namespace.TheAnnotation in that project

public @interface TheAnnotation {

which produces an interface (e.g. GeneratedInterfaceSpecificMapper, see below) with plenty of default. In the very same project, this annotation is also applied to some classes,

@TheAnnotation(Specific.class)
public class SpecificMapper implements GeneratedInterfaceSpecificMapper {

Evidently, maven discovers the annotation, the annotation processor, runs code generation through the processor (files appear in generated-sources/annotations/...) and is able to also compile the source files that make use of the GeneratedInterfaceSpecificMapper.

The vscode plugin flags the type GeneratedInterfaceSpecificMapper as faulty, with "[Java] cannot be resolved to a type". This seems to indicate that the vscode plugin is not aware of the generated artefacts in generated-sources/annotations/...

I have had a look at https://www.baeldung.com/java-annotation-processing-builder to see whether this produces the error - alas, that setup there seems to be too clean / too simplistic to trigger the problem.

Environment
Steps To Reproduce

<large project, will try to find time to reduce>

Current Result
Expected Result
Additional Informations

Not sure whether this related to the issues reported for Lombok - e.g #580 or #458

fbricon commented 6 years ago

There's a known limitation in Eclipse JDT where you can not apply annotation processors in the same workspace as where they're defined. i.e. you can't have: workspace:

shoffmeister commented 6 years ago

For reference: The Baeldung link seems to point to the setup you describe - and seems to work.

My setup here is even worse: The annotation processor implementation is embedded into the project which is being annotated. Self-modifying code at build-time, if you like.

fbricon commented 6 years ago

If it won't work in Eclipse, then it won't work in vscode-java. Sorry.