gradle build fails with 'Could not load FFI Provider ..' on Windows

[ropley]

Cloned the develop repository, updated the submodules and ran ./gradlew. I got the error below. Googling suggests its a jruby configuration problem but I'm not clear about how jruby is configured for this project.

$ ./gradlew
:compileJava 
warning: [options] bootstrap class path not set in conjunction with -source 1.7
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details. 
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
... some lines skipped
ERROR:  Loading command: install (LoadError)
Could not load FFI Provider: (NotImplementedError) FFI not available: null
See http://jira.codehaus.org/browse/JRUBY-4583
ERROR:  While executing gem ... (NoMethodError)
undefined method `invoke_with_build_args' for nil:NilClass
                                                                           :
html5:compassCompile                                                           FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':html5:compassCompile'.
> Process 'command 'C:\Program Files\Java\jdk1.8.0_40\bin\java.exe'' finished wi
th non-zero exit value 1

[ropley]

... it works fine on Linux :0)

[eerohele]

This is a problem with the Gradle Compass plugin. See robfletcher/gradle-compass#37 and robfletcher/gradle-compass#39.

This comment suggests a workaround.

[jelovirt]

Can someone with Windows test the workaround in OT's gradle configuration and verify it would work?

[eerohele]

Can someone with Windows test the workaround in OT's gradle configuration and verify it would work?

Works for me.

[jelovirt]

@eerohele could you fix and push to develop directly, no PR needed.