[2.4.0 java] eclipse reporting errors on Messages (and others) in scala template files after migration

[Fabian Gilson]

Hi,

Since I migrated to 2.4, eclipse (with scala IDE and Play plugins) reports errors on any usage of Messages (but project compiles in activator).

I tried to recreate the project files from scratch (via activator ui, from sources only), but behavior is the same. I also installed the fork Play plugin as suggested in https://www.google.com/url?q=https%3A%2F%2Fgithub.com%2Fcweinreben%2Fscala-ide-play2&sa=D&sntz=1&usg=AFQjCNEiPtY4LGMBdDMiqD64pgpUlfsMKQ . It fixed part of the problem, but not the Messages (or flash) usages. Error is:

Multiple annotations found at this line:
    - could not find implicit value for parameter messages: play.api.i18n.Messages
    - not enough arguments for method apply: (implicit messages: play.api.i18n.Messages)String
     in object Messages. Unspecified value parameter messages.

I can get rid of the errors in Eclipse by calling directly play.i18n.Messages.get("somekey"). It looks like a classpath problem in eclipse, but I could not find how to fix it.

Thanks for any advice,
Fabian

[Fabian Gilson]

 Sorry to bump this, but it looks like it is a build path problem. Any way to fix this ?

I tried to eclipsify (from activator and ui) a couple o times, also tried to reimport my fully-running 2.3.9 project from scratch, but nothing happened... Pretty annoying.

Any clue?

[Evan Bennett]

Have you tried:

* (in Eclipse) right-click on you project and select 'Properties'

* click on the 'Play2' option in the left menu

* you can change the 'Template default imports'

I have not tried this yet. I just noticed it was there.

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[Fabian Gilson]

The forked play-plugin resolved the top error message shown above. But all my other templates and generated sources (like the "routes"), are not recognized too. This is pretty annoying since before I upgraded from 2.3.9, everything was running smoothly.

I finally moved to intellij... and so far so good (after some struggling, but finally, java editors are at least not reporting dumb errors (after setting target/scala folder as generated source folder). But I still cannot have autocompletion in template files. Hope to solve this last issue...

[Naftoli Gugenheim]

Which edition of intellij?

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[Jay Q.]

I had the same problem with 2.4 and did to do 2 things:

1. Run activator eclipse (from Activator UI or command line)
2. Go to Java Build Path > Libraries > Add External Class Folder and point it to the output folder: target/scala-<version>/classes

[Fabian Gilson]

Latest (14.1.4 community). Had to point to the make the scala-xx/classes_managed, routes and twirl as generated source folders. But still unable to have autocomplete in template files.
Also, I tried to import as said the the 2.4 doc (as an sbt project), but it did not work. I finally used the old idea-gen, imported as a scala project and tweaked the build path (as mentioned earlier).

[Naftoli Gugenheim]

Indeed, the community edition does not support play-specific features, like twirl templates and the routes file. For that you need Ultimate.

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