Java precommit flaky (timing out)

Java precommits are sometimes timing out with no clear cause. Gradle will log a bunch of routine build tasks, and then Jenkins will abort the job much later. There are no logs to indicate what happened. It is not even clear which task or tasks, if any, was the culprit, since many tasks are run in parallel.

01:53:28 > Task :sdks:java:testing:nexmark:build
01:53:28 > Task :sdks:java:testing:nexmark:buildDependents
01:53:28 > Task :sdks:java:extensions:sql:zetasql:buildDependents
01:53:28 > Task :sdks:java:io:google-cloud-platform:buildDependents
01:53:28 > Task :sdks:java:extensions:sql:buildDependents
01:53:28 > Task :sdks:java:io:kafka:buildDependents
01:53:28 > Task :sdks:java:extensions:join-library:buildDependents
01:53:28 > Task :sdks:java:io:synthetic:buildDependents
01:53:28 > Task :sdks:java:io:mongodb:buildDependents
01:53:28 > Task :sdks:java:io:thrift:buildDependents
01:53:28 > Task :sdks:java:testing:test-utils:buildDependents
01:53:28 > Task :sdks:java:expansion-service:buildDependents
01:53:28 > Task :sdks:java:extensions:arrow:buildDependents
01:53:28 > Task :sdks:java:extensions:protobuf:buildDependents
01:53:28 > Task :sdks:java:io:common:buildDependents
01:53:28 > Task :runners:direct-java:buildDependents
01:53:28 > Task :runners:local-java:buildDependents
01:53:28 Build timed out (after 120 minutes). Marking the build as aborted.

https://ci-beam.apache.org/job/beam_PreCommit_Java_cron/4874/