4.0 breaking change: Java coverage #12793
Description
I'm not sure if there is a bug, or if this is just missing documentation (and if such documentation would be in the 4.0 release)
It seems that 4.0 introduces a breaking change for bazel coverage on Java targets, where the jacocorunner must now be configured in a toolchain. The default auto-discovered toolchain does not have one set, and after some digging I have not been able to create my own.
Every attempt to make a default_java_toolchain gives me an error like this:
(16:42:43) ERROR: Misconfigured toolchains: @remote_java_tools_darwin//:toolchain is declared as a toolchain but has inappropriate dependencies. Declared toolchains should be created with the 'toolchain' rule and should not have dependencies that themselves require toolchains.
.-> RegisteredToolchains
| @remote_java_tools_darwin//:toolchain
| @bazel_tools//tools/jdk:proguard_whitelister
| toolchain types @bazel_tools//tools/python:toolchain_type, @bazel_tools//tools/cpp:toolchain_type
| toolchain type @bazel_tools//tools/cpp:toolchain_type
`-- RegisteredToolchains
Is it expected that users need to create their own java_toolchain to keep coverage working? If so, how?