Bazel: JavaInfo starlark constructor doesn't fill compilation_info member

[ittaiz]

Description of the problem / feature request:

JavaInfo instances created from starlark have a None value in compilation_info

Bugs: what's the simplest, easiest way to reproduce this bug? Please provide a minimal example if possible.

https://github.com/bazelbuild/rules_scala/pull/872

What's the output of bazel info release?

1.1.0

Any other information, logs, or outputs that you want to share?

Two important notes:

1. This is blocking moving IntelliJ plugin to use JavaInfo provider instead of the scala attribute.
   https://github.com/bazelbuild/intellij/blob/master/aspect/intellij_info_impl.bzl#L505
   https://github.com/bazelbuild/intellij/blob/master/aspect/java_classpath.bzl#L22
2. This also means https://github.com/bazelbuild/bazel/issues/9014 is blocked since we can't move to providers without IntelliJ support and I think they need the compilation_info member for that (but I might be wrong). cc @brendandouglas as an expert of whether or not IJ can use other data from the JavaInfo provider is compilation_info is None

[ittaiz]

cc @iirina

[ittaiz]

I took a look and it's not actually blocking the move to attribute since IJ can just use target[JavaInfo].transitive_runtime_jars for now

[brendandouglas]

+1 -- this is important for IntelliJ support (and for any non-native java rules). We'll workaround it in the short-term, but I think it's very important to fix this on the Bazel side.

[ittaiz]

@aiuto @iirina any ideas when this will be triaged?