[JENKINS] Lucene-Solr-6.4-Windows (64bit/jdk1.8.0_121) - Build # 7 - Failure!

[Policeman Jenkins Server <je...@thetaphi.de>]

Build: https://jenkins.thetaphi.de/job/Lucene-Solr-6.4-Windows/7/
Java: 64bit/jdk1.8.0_121 -XX:-UseCompressedOops -XX:+UseSerialGC

All tests passed

Build Log:
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  [javadoc] Generating Javadoc
  [javadoc] Javadoc execution
  [javadoc] Loading source files for package org.apache.lucene...
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  [javadoc] Loading source files for package org.apache.lucene.codecs.blocktree...
  [javadoc] Loading source files for package org.apache.lucene.codecs.compressing...
  [javadoc] Loading source files for package org.apache.lucene.codecs.lucene50...
  [javadoc] Loading source files for package org.apache.lucene.codecs.lucene53...
  [javadoc] Loading source files for package org.apache.lucene.codecs.lucene54...
  [javadoc] Loading source files for package org.apache.lucene.codecs.lucene60...
  [javadoc] Loading source files for package org.apache.lucene.codecs.lucene62...
  [javadoc] Loading source files for package org.apache.lucene.codecs.perfield...
  [javadoc] Loading source files for package org.apache.lucene.document...
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  [javadoc] Constructing Javadoc information...
  [javadoc] 1 error

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BUILD FAILED
C:\Users\jenkins\workspace\Lucene-Solr-6.4-Windows\build.xml:775: The following error occurred while executing this line:
C:\Users\jenkins\workspace\Lucene-Solr-6.4-Windows\build.xml:101: The following error occurred while executing this line:
C:\Users\jenkins\workspace\Lucene-Solr-6.4-Windows\lucene\build.xml:138: The following error occurred while executing this line:
C:\Users\jenkins\workspace\Lucene-Solr-6.4-Windows\lucene\common-build.xml:746: The following error occurred while executing this line:
C:\Users\jenkins\workspace\Lucene-Solr-6.4-Windows\lucene\core\build.xml:54: The following error occurred while executing this line:
C:\Users\jenkins\workspace\Lucene-Solr-6.4-Windows\lucene\common-build.xml:2100: Javadoc returned 1

Total time: 89 minutes 25 seconds
Build step 'Invoke Ant' marked build as failure
Archiving artifacts
[WARNINGS] Skipping publisher since build result is FAILURE
Recording test results
Email was triggered for: Failure - Any
Sending email for trigger: Failure - Any