See 
https://ci-builds.apache.org/job/Maven/job/maven-box/job/maven-indexer/job/MINDEXER-116x/11/

Changes:

* Create Dependabot config file
* Bump junit from 4.12 to 4.13
* [MINDEXER-116] Move code to Java 7 syntax

No tests ran.

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https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-compiler-api/2.8.4/plexus-compiler-api-2.8.4.jar
[INFO] Downloading from central: 
https://repo.maven.apache.org/maven2/com/thoughtworks/qdox/qdox/2.0-M9/qdox-2.0-M9.jar
[INFO] Downloading from central: 
https://repo.maven.apache.org/maven2/org/ow2/asm/asm/6.2/asm-6.2.jar
[INFO] Downloading from central: 
https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-java/0.9.10/plexus-java-0.9.10.jar
[INFO] Downloaded from central: 
https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-java/0.9.10/plexus-java-0.9.10.jar
 (39 kB at 1.2 MB/s)
[INFO] Downloaded from central: 
https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-shared-incremental/1.1/maven-shared-incremental-1.1.jar
 (14 kB at 387 kB/s)
[INFO] Downloading from central: 
https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-compiler-javac/2.8.4/plexus-compiler-javac-2.8.4.jar
[INFO] Downloaded from central: 
https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-compiler-api/2.8.4/plexus-compiler-api-2.8.4.jar
 (27 kB at 821 kB/s)
[INFO] Downloaded from central: 
https://repo.maven.apache.org/maven2/org/ow2/asm/asm/6.2/asm-6.2.jar (111 kB at 
3.2 MB/s)
[INFO] Downloading from central: 
https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-compiler-manager/2.8.4/plexus-compiler-manager-2.8.4.jar
[INFO] Downloaded from central: 
https://repo.maven.apache.org/maven2/com/thoughtworks/qdox/qdox/2.0-M9/qdox-2.0-M9.jar
 (317 kB at 7.6 MB/s)
[INFO] Downloaded from central: 
https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-compiler-javac/2.8.4/plexus-compiler-javac-2.8.4.jar
 (21 kB at 373 kB/s)
[INFO] Downloaded from central: 
https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-compiler-manager/2.8.4/plexus-compiler-manager-2.8.4.jar
 (4.7 kB at 75 kB/s)
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 139 source files to 
F:\jenkins\jenkins-slave\712657a4\workspace\_box_maven-indexer_MINDEXER-116x\m\indexer-core\target\classes
[INFO] 
/F:/jenkins/jenkins-slave/712657a4/workspace/_box_maven-indexer_MINDEXER-116x/m/indexer-core/src/main/java/org/apache/maven/index/NexusIndexer.java:
 Some input files use or override a deprecated API.
[INFO] 
/F:/jenkins/jenkins-slave/712657a4/workspace/_box_maven-indexer_MINDEXER-116x/m/indexer-core/src/main/java/org/apache/maven/index/NexusIndexer.java:
 Recompile with -Xlint:deprecation for details.
[INFO] Some messages have been simplified; recompile with -Xdiags:verbose to 
get full output
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] 
/F:/jenkins/jenkins-slave/712657a4/workspace/_box_maven-indexer_MINDEXER-116x/m/indexer-core/src/main/java/org/apache/maven/index/context/TrackingLockFactory.java:[47,40]
 method newSetFromMap in class java.util.Collections cannot be applied to given 
types;
  required: java.util.Map<E,java.lang.Boolean>
  found:    
java.util.concurrent.ConcurrentHashMap<java.lang.Object,java.lang.Object>
  reason: cannot infer type-variable(s) E
    (argument mismatch; 
java.util.concurrent.ConcurrentHashMap<java.lang.Object,java.lang.Object> 
cannot be converted to java.util.Map<E,java.lang.Boolean>)
[ERROR] 
/F:/jenkins/jenkins-slave/712657a4/workspace/_box_maven-indexer_MINDEXER-116x/m/indexer-core/src/main/java/org/apache/maven/index/creator/MavenPluginArtifactInfoIndexCreator.java:[104,34]
 incompatible types: java.util.ArrayList<java.lang.Object> cannot be converted 
to java.util.List<java.lang.String>
[INFO] 2 errors 
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary for Maven-Indexer 6.1.0-SNAPSHOT:
[INFO] 
[INFO] Maven-Indexer ...................................... SUCCESS [ 32.803 s]
[INFO] Maven :: Indexer Core .............................. FAILURE [ 16.377 s]
[INFO] Maven :: Indexer CLI ............................... SKIPPED
[INFO] Maven :: Indexer Reader ............................ SKIPPED
[INFO] Maven :: Indexer Examples .......................... SKIPPED
[INFO] Maven :: Indexer Examples [Basic] .................. SKIPPED
[INFO] Maven :: Indexer Examples [Spring] ................. SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  01:03 min
[INFO] Finished at: 2020-08-14T15:54:31-07:00
[INFO] ------------------------------------------------------------------------
[WARNING] The requested profile "run-its" could not be activated because it 
does not exist.
[INFO] [jenkins-event-spy] Generated 
F:\jenkins\jenkins-slave\712657a4\workspace\_box_maven-indexer_MINDEXER-116x@tmp\withMaven9a9db0e7\maven-spy-20200814-155328-3409270233959066274279.log
[ERROR] Failed to execute goal 
org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) 
on project indexer-core: Compilation failure: Compilation failure: 
[ERROR] 
/F:/jenkins/jenkins-slave/712657a4/workspace/_box_maven-indexer_MINDEXER-116x/m/indexer-core/src/main/java/org/apache/maven/index/context/TrackingLockFactory.java:[47,40]
 method newSetFromMap in class java.util.Collections cannot be applied to given 
types;
[ERROR]   required: java.util.Map<E,java.lang.Boolean>
[ERROR]   found:    
java.util.concurrent.ConcurrentHashMap<java.lang.Object,java.lang.Object>
[ERROR]   reason: cannot infer type-variable(s) E
[ERROR]     (argument mismatch; 
java.util.concurrent.ConcurrentHashMap<java.lang.Object,java.lang.Object> 
cannot be converted to java.util.Map<E,java.lang.Boolean>)
[ERROR] 
/F:/jenkins/jenkins-slave/712657a4/workspace/_box_maven-indexer_MINDEXER-116x/m/indexer-core/src/main/java/org/apache/maven/index/creator/MavenPluginArtifactInfoIndexCreator.java:[104,34]
 incompatible types: java.util.ArrayList<java.lang.Object> cannot be converted 
to java.util.List<java.lang.String>
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e 
switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please 
read the following articles:
[ERROR] [Help 1] 
http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
[ERROR] 
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR]   mvn <args> -rf :indexer-core
[Pipeline] }
[Pipeline] // dir
[Pipeline] }
[DevOpticsMavenPublisher] dependencies consumed: 0, artifacts produced: 2
[withMaven] Publishers: CloudBees DevOptics Gate Artifact Publisher: 3032 ms
[Pipeline] // withMaven
[Pipeline] echo
[FAILURE-004] hudson.AbortException: script returned exit code 1
[Pipeline] cleanWs
[WS-CLEANUP] Deleting project workspace...
[WS-CLEANUP] Deferred wipeout is used...
[WS-CLEANUP] done
[Pipeline] cleanWs
[WS-CLEANUP] Deleting project workspace...
[WS-CLEANUP] Deferred wipeout is used...
[WS-CLEANUP] done
[Pipeline] }
[Pipeline] // stage
[Pipeline] }
[Pipeline] // node
[Pipeline] }
Failed in branch windows-jdk15
[Pipeline] // parallel
[Pipeline] echo
[FAILURE-003] AbortException hudson.AbortException: script returned exit code 1
[Pipeline] stage
[Pipeline] { (Notifications)
[Pipeline] echo
Build result: FAILURE
[Pipeline] jiraIssueSelector
[Pipeline] jiraComment
[Pipeline] echo
The authors of changes [slachiewicz].
[Pipeline] echo
Sending email ...
[Pipeline] emailext

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