Java & Spark postcommits failing.

Both beam_PostCommit_Java and beam_PostCommit_Java_ValidatesRunner_Spark are failing with error:

04:15:13 FAILURE: Build failed with an exception.
04:15:13
04:15:13 * What went wrong:
04:15:13 Execution failed for task ':runners:spark:validatesRunnerBatch'.
04:15:13 > Process 'Gradle Test Executor 364' finished with non-zero exit value 1
04:15:13 This problem might be caused by incorrect test process configuration.
04:15:13 Please refer to the test execution section in the User Manual at https://docs.gradle.org/6.7/userguide/java_testing.html#sec:test_execution