Mark Gradle's build directories as derived resources

[tbrannt]

Reopening https://jira.spring.io/browse/STS-2832

By default the command-line gradle outputs to the project's build directory. The default Eclipse output is the bin directory. These should remain separate.

The Eclipse resource view includes the compiled files in the build directory. It would improve the usability if these directories were marked as "derived" when importing a project.

The workaround [1] of rewriting the project file to add resource filters is error prone and resulted in STS-2822. It would be nice if this was part of the plugin instead.

[1] http://forums.gradle.org/gradle/topics/eclipse_generated_files_should_be_put_in_the_same_place_as_the_gradle_generated_files

I came across the exact problem described in STS-2832 while using buildship. However this issue was closed with a hint to reopen it here.

[martinlippert]

We do only minimal maintenance work on this project at the moment and users should migrate over to use Buildship instead.

Therefore I am not exactly sure what you mean with your comment above about already using Buildship and coming across this problem, too. Is this a problem when using Buildship? Can you post a link to the discussion that you mentioned above (about the hint to post here), so that I can follow up there, too?

[paulvi]

@tbrannt Buildship issues are at https://github.com/eclipse/buildship

[tbrannt]

Sorry, intended to open this in the buildship repo