Build failed in Jenkins: bookkeeper-seed #209

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See <https://builds.apache.org/job/bookkeeper-seed/209/display/redirect>

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GitHub pull request #1425 of commit b7e4577ef8ff74e342f403e2b7c34f406394b004, no merge conflicts.
Setting status of b7e4577ef8ff74e342f403e2b7c34f406394b004 to PENDING with url https://builds.apache.org/job/bookkeeper-seed/209/ and message: 'Build started sha1 is merged.'
Using context: Jenkins: Seed Job
[EnvInject] - Loading node environment variables.
Building remotely on H28 (ubuntu xenial) in workspace <https://builds.apache.org/job/bookkeeper-seed/ws/>
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url https://github.com/apache/bookkeeper.git # timeout=10
Fetching upstream changes from https://github.com/apache/bookkeeper.git
 > git --version # timeout=10
 > git fetch --tags --progress https://github.com/apache/bookkeeper.git +refs/heads/*:refs/remotes/origin/* +refs/pull/1425/*:refs/remotes/origin/pr/1425/*
 > git rev-parse refs/remotes/origin/pr/1425/merge^{commit} # timeout=10
 > git rev-parse refs/remotes/origin/origin/pr/1425/merge^{commit} # timeout=10
Checking out Revision 57a9c8520a8887115f517875d9460ea1cc744e97 (refs/remotes/origin/pr/1425/merge)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 57a9c8520a8887115f517875d9460ea1cc744e97
Commit message: "Merge b7e4577ef8ff74e342f403e2b7c34f406394b004 into 9ca77faf2ab2d175a7bdefec94f5d9a47b08d4f8"
First time build. Skipping changelog.
Cleaning workspace
 > git rev-parse --verify HEAD # timeout=10
Resetting working tree
 > git reset --hard # timeout=10
 > git clean -fdx # timeout=10
Processing DSL script job_bookkeeper_codecoverage.groovy
Processing DSL script job_bookkeeper_postcommit_master_java8.groovy
Processing DSL script job_bookkeeper_postcommit_master_java9.groovy
Processing DSL script job_bookkeeper_postcommit_validation_master.groovy
Processing DSL script job_bookkeeper_postcommit_website.groovy
Processing DSL script job_bookkeeper_precommit_bookie_tests.groovy
ERROR: startup failed:
job_bookkeeper_precommit_bookie_tests.groovy: 42: unexpected char: '\' @ line 42, column 8.
       '.*\[skip (bookie )?tests\].*',
          ^

1 error

Jenkins build is back to normal : bookkeeper-seed #210

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See <https://builds.apache.org/job/bookkeeper-seed/210/display/redirect?page=changes>