[JENKINS] Solr-Artifacts-5.x - Build # 769 - Failure

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Build: https://builds.apache.org/job/Solr-Artifacts-5.x/769/

No tests ran.

Build Log:
[...truncated 12330 lines...]
    [javac] Compiling 756 source files to /usr/home/jenkins/jenkins-slave/workspace/Solr-Artifacts-5.x/solr/build/solr-core/classes/java
    [javac] /usr/home/jenkins/jenkins-slave/workspace/Solr-Artifacts-5.x/solr/core/src/java/org/apache/solr/cloud/ZkController.java:173: error: incompatible types
    [javac]   private final Map<ContextKey, ElectionContext> electionContexts = Collections.synchronizedMap(new HashMap<>());
    [javac]                                                                                                ^
    [javac]   required: Map<ContextKey,ElectionContext>
    [javac]   found:    Map<Object,Object>
    [javac] Note: Some input files use or override a deprecated API.
    [javac] Note: Recompile with -Xlint:deprecation for details.
    [javac] Note: Some input files use unchecked or unsafe operations.
    [javac] Note: Recompile with -Xlint:unchecked for details.
    [javac] 1 error

BUILD FAILED
/usr/home/jenkins/jenkins-slave/workspace/Solr-Artifacts-5.x/solr/build.xml:453: The following error occurred while executing this line:
/usr/home/jenkins/jenkins-slave/workspace/Solr-Artifacts-5.x/solr/common-build.xml:388: The following error occurred while executing this line:
/usr/home/jenkins/jenkins-slave/workspace/Solr-Artifacts-5.x/lucene/common-build.xml:520: The following error occurred while executing this line:
/usr/home/jenkins/jenkins-slave/workspace/Solr-Artifacts-5.x/lucene/common-build.xml:1882: Compile failed; see the compiler error output for details.

Total time: 1 minute 58 seconds
Build step 'Invoke Ant' marked build as failure
Archiving artifacts
Sending artifact delta relative to Solr-Artifacts-5.x #768
Archived 3 artifacts
Archive block size is 32768
Received 0 blocks and 37563361 bytes
Compression is 0.0%
Took 40 sec
Publishing Javadoc
Email was triggered for: Failure
Sending email for trigger: Failure