Scala Akka example tests are failing on Windows

```
PS C:\Users\jingwen\Code\rules_jvm_external\examples\scala_akka> bazel test //... --test_output=errors
INFO: Analysed 4 targets (0 packages loaded, 0 targets configured).
INFO: Found 2 targets and 2 test targets...
FAIL: //:test_test_suite_src_test_scala_hello_ConfigurationSpec.scala (see C:/users/jingwen/_bazel_jingwen/viloy4hd/execroot/__main__/bazel-out/x64_windows-fastbuild/testlogs/test_test_suite_src_test_scala_hello_ConfigurationSpec.scala/test.log)
INFO: From Testing //:test_test_suite_src_test_scala_hello_ConfigurationSpec.scala:
==================== Test output for //:test_test_suite_src_test_scala_hello_ConfigurationSpec.scala:
C:/users/jingwen/_bazel_jingwen/viloy4hd/execroot/__main__/bazel-out/x64_windows-fastbuild/bin/test_test_suite_src_test_scala_hello_ConfigurationSpec.scala: line 334: C:\users\jingwen\_bazel_jingwen\viloy4hd\execroot\__main__\bazel-out\x64_windows-fastbuild\bin\test_test_suite_src_test_scala_hello_ConfigurationSpec.scala.runfiles/local_jdk/bin/jar.exe: No such file or directory
C:/users/jingwen/_bazel_jingwen/viloy4hd/execroot/__main__/bazel-out/x64_windows-fastbuild/bin/test_test_suite_src_test_scala_hello_ConfigurationSpec.scala: line 83: printf: missing unicode digit for \u
C:/users/jingwen/_bazel_jingwen/viloy4hd/execroot/__main__/bazel-out/x64_windows-fastbuild/bin/test_test_suite_src_test_scala_hello_ConfigurationSpec.scala: ERROR: /c/users/jingwen/_bazel_jingwen/viloy4hd/execroot/__main__/bazel-out/x64_windows-fastbuild/bin/test_test_suite_src_test_scala_hello_ConfigurationSpec.scala failed because C:\users\jingwen\_bazel_jingweniloy4hdecroot\__main_azel-outd_windows-fastbuilin est_test_suite_src_test_scala_hello_ConfigurationSpec.scala.runfiles/local_jdk/bin/jar.exe failed
================================================================================
FAIL: //:test_test_suite_src_test_scala_hello_EndpointSpec.scala (see C:/users/jingwen/_bazel_jingwen/viloy4hd/execroot/__main__/bazel-out/x64_windows-fastbuild/testlogs/test_test_suite_src_test_scala_hello_EndpointSpec.scala/test.log)
INFO: From Testing //:test_test_suite_src_test_scala_hello_EndpointSpec.scala:
==================== Test output for //:test_test_suite_src_test_scala_hello_EndpointSpec.scala:
C:/users/jingwen/_bazel_jingwen/viloy4hd/execroot/__main__/bazel-out/x64_windows-fastbuild/bin/test_test_suite_src_test_scala_hello_EndpointSpec.scala: line 334: C:\users\jingwen\_bazel_jingwen\viloy4hd\execroot\__main__\bazel-out\x64_windows-fastbuild\bin\test_test_suite_src_test_scala_hello_EndpointSpec.scala.runfiles/local_jdk/bin/jar.exe: No such file or directory
C:/users/jingwen/_bazel_jingwen/viloy4hd/execroot/__main__/bazel-out/x64_windows-fastbuild/bin/test_test_suite_src_test_scala_hello_EndpointSpec.scala: line 83: printf: missing unicode digit for \u
C:/users/jingwen/_bazel_jingwen/viloy4hd/execroot/__main__/bazel-out/x64_windows-fastbuild/bin/test_test_suite_src_test_scala_hello_EndpointSpec.scala: ERROR: /c/users/jingwen/_bazel_jingwen/viloy4hd/execroot/__main__/bazel-out/x64_windows-fastbuild/bin/test_test_suite_src_test_scala_hello_EndpointSpec.scala failed because C:\users\jingwen\_bazel_jingweniloy4hdecroot\__main_azel-outd_windows-fastbuilin est_test_suite_src_test_scala_hello_EndpointSpec.scala.runfiles/local_jdk/bin/jar.exe failed
================================================================================
INFO: Elapsed time: 3.911s, Critical Path: 2.98s
INFO: 4 processes: 4 local.
INFO: Build completed, 2 tests FAILED, 3 total actions
//:test_test_suite_src_test_scala_hello_ConfigurationSpec.scala FAILED in 1.9s
C:/users/jingwen/_bazel_jingwen/viloy4hd/execroot/__main__/bazel-out/x64_windows-fastbuild/testlogs/test_test_suite_src_test_scala_hello_ConfigurationSpec.scala/test.log
//:test_test_suite_src_test_scala_hello_EndpointSpec.scala FAILED in 2.2s
C:/users/jingwen/_bazel_jingwen/viloy4hd/execroot/__main__/bazel-out/x64_windows-fastbuild/testlogs/test_test_suite_src_test_scala_hello_EndpointSpec.scala/test.log
```

Reproduce with `bazel test //... --test_output=errors` from the `examples/scala_akka` directory on Windows, then inspect the two named test logs and the generated test targets. Trace the `local_jdk/bin/jar.exe` failure and the path or printf errors shown there. Done means both ConfigurationSpec and EndpointSpec pass on Windows without these errors.

Written by the indexing model from the issue text.