aspects.bzl attempts to access non-existent struct field

[bbarnes52]

Experiencing the following error:

2022.06.28 18:22:34 ERROR (18:22:34) ^[[31m^[[1mERROR: ^[[0m/Users/brian.barnes/universe/common/lazy/BUILD:7:16: in //.bazelbsp:aspects.bzl%bsp_target_info_aspect aspect on generic_scala_worker rule //common/lazy:lazy-spark_3.0_2.12: ^[[0m
2022.06.28 18:22:34 ERROR Traceback (most recent call last):^[[0m
2022.06.28 18:22:34 ERROR       File "/Users/brian.barnes/universe/.bazelbsp/aspects.bzl", line 475, column 41, in _bsp_target_info_aspect_impl^[[0m
2022.06.28 18:22:34 ERROR               java_target_info = extract_java_info(target, ctx, output_groups)^[[0m
2022.06.28 18:22:34 ERROR       File "/Users/brian.barnes/universe/.bazelbsp/aspects.bzl", line 208, column 40, in extract_java_info^[[0m
2022.06.28 18:22:34 ERROR               java_outputs = provider.outputs.jars^[[0m
2022.06.28 18:22:34 ERROR Error: 'struct' value has no field or method 'jars'^[[0m
2022.06.28 18:22:34 ERROR Available attributes: class_jar, ijar, source_jars^[[0m

The relevant code snippet is reproduced below:

elif hasattr(provider, "outputs") and provider.outputs:
    java_outputs = provider.outputs.jars

Should this instead read:

elif hasattr(provider, "outputs") and provider.outputs and hasattr(provider.outputs, "jars") and provider.outputs.jars:
    java_outputs = provider.outputs.jars

[Łukasz Wawrzyk]

What is your bazel version and what rules are you using for scala?

[bbarnes52]

The scala rules are custom and the scala attribute doesn't implement JavaInfo. My apologies for the noise

[Marcin Abramowicz]

nevertheless, having safer aspects would be good - I'll fix it later