Launchpad Testing: Running mvn package without clean leads to errors with the animal-sniffer-plugin

[INFO] Scanning for projects...
[INFO] 
[INFO] Using the builder org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder with a thread count of 1
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building Apache Sling Launchpad Testing 7-SNAPSHOT
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[INFO] 
[INFO] --- maven-enforcer-plugin:1.3.1:enforce (enforce-java) @ org.apache.sling.launchpad.testing ---
[INFO] 
[INFO] --- maven-antrun-plugin:1.7:run (set-bundle-required-execution-environment) @ org.apache.sling.launchpad.testing ---
[INFO] Executing tasks

main:
[INFO] Executed tasks
[INFO] 
[INFO] --- maven-remote-resources-plugin:1.5:process (default) @ org.apache.sling.launchpad.testing ---
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ org.apache.sling.launchpad.testing ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /Users/kwindszus/Workspaces/Sling/sling-builder/launchpad/testing/src/main/resources
[INFO] Copying 3 resources
[INFO] 
[INFO] --- maven-antrun-plugin:1.7:run (check-memory-task) @ org.apache.sling.launchpad.testing ---
[INFO] Executing tasks

main:
     [echo] **************** WARNING (SLING-443/SLING-1782) ******************************
     [echo] On most platforms, you'll get OutOfMemoryErrors when building unless you set
     [echo] on 32bit platforms: MAVEN_OPTS="-Xmx256M -XX:MaxPermSize=256M", see SLING-443
     [echo] on 64bit platforms: MAVEN_OPTS="-Xmx512M -XX:MaxPermSize=512M", see SLING-1782
     [echo] ******************************************************************************
[INFO] Executed tasks
[INFO] 
[INFO] --- build-helper-maven-plugin:1.8:reserve-network-port (reserve-network-port) @ org.apache.sling.launchpad.testing ---
[INFO] Reserved port 41600 for http.port
[INFO] Reserved port 41601 for sling.control.port
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ org.apache.sling.launchpad.testing ---
[INFO] No sources to compile
[INFO] 
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ org.apache.sling.launchpad.testing ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] Copying 3 resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ org.apache.sling.launchpad.testing ---
[INFO] No sources to compile
[INFO] 
[INFO] --- maven-surefire-plugin:2.17:test (default-test) @ org.apache.sling.launchpad.testing ---
[INFO] 
[INFO] --- animal-sniffer-maven-plugin:1.11:check (default) @ org.apache.sling.launchpad.testing ---
[INFO] Checking unresolved references to org.codehaus.mojo.signature:java15:1.0
[ERROR] /Users/kwindszus/Workspaces/Sling/sling-builder/launchpad/testing/target/classes/org/apache/sling/launchpad/app/ControlListener.class:297: Undefined reference: java.lang.management.ThreadInfo[] java.lang.management.ThreadMXBean.dumpAllThreads(boolean, boolean)
[ERROR] /Users/kwindszus/Workspaces/Sling/sling-builder/launchpad/testing/target/classes/org/apache/sling/launchpad/app/ControlListener.class:303: Undefined reference: java.lang.management.LockInfo[] java.lang.management.ThreadInfo.getLockedSynchronizers()
[ERROR] /Users/kwindszus/Workspaces/Sling/sling-builder/launchpad/testing/target/classes/org/apache/sling/launchpad/app/ControlListener.class:308: Undefined reference: String java.lang.management.LockInfo.getClassName()
[ERROR] /Users/kwindszus/Workspaces/Sling/sling-builder/launchpad/testing/target/classes/org/apache/sling/launchpad/app/ControlListener.class:308: Undefined reference: int java.lang.management.LockInfo.getIdentityHashCode()
[ERROR] /Users/kwindszus/Workspaces/Sling/sling-builder/launchpad/testing/target/classes/org/apache/sling/launchpad/app/ControlListener.class:324: Undefined reference: boolean java.lang.management.ThreadMXBean.isSynchronizerUsageSupported()
[ERROR] /Users/kwindszus/Workspaces/Sling/sling-builder/launchpad/testing/target/classes/org/apache/sling/launchpad/app/ControlListener.class:325: Undefined reference: long[] java.lang.management.ThreadMXBean.findDeadlockedThreads()
[ERROR] /Users/kwindszus/Workspaces/Sling/sling-builder/launchpad/testing/target/classes/org/apache/sling/launchpad/app/ControlListener.class:330: Undefined reference: java.lang.management.ThreadInfo[] java.lang.management.ThreadMXBean.getThreadInfo(long[], boolean, boolean)
[ERROR] /Users/kwindszus/Workspaces/Sling/sling-builder/launchpad/testing/target/classes/org/apache/sling/launchpad/app/ControlListener.class:358: Undefined reference: java.lang.management.LockInfo java.lang.management.ThreadInfo.getLockInfo()
[ERROR] /Users/kwindszus/Workspaces/Sling/sling-builder/launchpad/testing/target/classes/org/apache/sling/launchpad/app/ControlListener.class:358: Undefined reference: String java.lang.management.LockInfo.getClassName()
[ERROR] /Users/kwindszus/Workspaces/Sling/sling-builder/launchpad/testing/target/classes/org/apache/sling/launchpad/app/ControlListener.class:358: Undefined reference: java.lang.management.LockInfo java.lang.management.ThreadInfo.getLockInfo()
[ERROR] /Users/kwindszus/Workspaces/Sling/sling-builder/launchpad/testing/target/classes/org/apache/sling/launchpad/app/ControlListener.class:358: Undefined reference: int java.lang.management.LockInfo.getIdentityHashCode()
[ERROR] /Users/kwindszus/Workspaces/Sling/sling-builder/launchpad/testing/target/classes/org/apache/sling/launchpad/app/ControlListener.class:410: Undefined reference: java.lang.management.MonitorInfo[] java.lang.management.ThreadInfo.getLockedMonitors()
[ERROR] /Users/kwindszus/Workspaces/Sling/sling-builder/launchpad/testing/target/classes/org/apache/sling/launchpad/app/ControlListener.class:428: Undefined reference: java.lang.management.LockInfo java.lang.management.ThreadInfo.getLockInfo()
[ERROR] /Users/kwindszus/Workspaces/Sling/sling-builder/launchpad/testing/target/classes/org/apache/sling/launchpad/app/ControlListener.class:429: Undefined reference: java.lang.management.LockInfo java.lang.management.ThreadInfo.getLockInfo()
[ERROR] /Users/kwindszus/Workspaces/Sling/sling-builder/launchpad/testing/target/classes/org/apache/sling/launchpad/app/ControlListener.class:429: Undefined reference: String java.lang.management.LockInfo.getClassName()
[ERROR] /Users/kwindszus/Workspaces/Sling/sling-builder/launchpad/testing/target/classes/org/apache/sling/launchpad/app/ControlListener.class:429: Undefined reference: java.lang.management.LockInfo java.lang.management.ThreadInfo.getLockInfo()
[ERROR] /Users/kwindszus/Workspaces/Sling/sling-builder/launchpad/testing/target/classes/org/apache/sling/launchpad/app/ControlListener.class:429: Undefined reference: int java.lang.management.LockInfo.getIdentityHashCode()
[ERROR] /Users/kwindszus/Workspaces/Sling/sling-builder/launchpad/testing/target/classes/org/apache/sling/launchpad/app/ControlListener.class:443: Undefined reference: int java.lang.management.MonitorInfo.getLockedStackDepth()
[ERROR] /Users/kwindszus/Workspaces/Sling/sling-builder/launchpad/testing/target/classes/org/apache/sling/launchpad/app/ControlListener.class:444: Undefined reference: String java.lang.management.MonitorInfo.getClassName()
[ERROR] /Users/kwindszus/Workspaces/Sling/sling-builder/launchpad/testing/target/classes/org/apache/sling/launchpad/app/ControlListener.class:444: Undefined reference: int java.lang.management.MonitorInfo.getIdentityHashCode()
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
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[INFO] Total time: 26.823 s
[INFO] Finished at: 2015-04-28T11:08:34+01:00
[INFO] Final Memory: 37M/241M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:animal-sniffer-maven-plugin:1.11:check (default) on project org.apache.sling.launchpad.testing: Signature errors found. Verify them and ignore them with the proper annotation if needed. -> [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