"did not find matching referal" warning in maven-bundle-plugin for log4j 1.2.17

[apjanke]

During mvn site assembly:assembly in log4j 1.2.17:

runAll:
[INFO] Executed tasks
[INFO] 
[INFO] --- maven-bundle-plugin:2.1.0:bundle (default-bundle) @ log4j ---
[WARNING] Warning building bundle net.janklab.opp.log4j:log4j:bundle:1.2.17-janklab.1 : Did not find matching referal for !com.ibm.uvm.tools.*
[WARNING] Warning building bundle net.janklab.opp.log4j:log4j:bundle:1.2.17-janklab.1 : Did not find matching referal for !com.sun.jdmk.comm.*
[WARNING] Warning building bundle net.janklab.opp.log4j:log4j:bundle:1.2.17-janklab.1 : Did not find matching referal for javax.jmdns.*
[INFO] 
[INFO] --- maven-javadoc-plugin:2.9.1:jar (default) @ log4j ---
[INFO] 
Loading source files for package reference...