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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

Solutions on the web

via Jenkins JIRA by digash, 1 year ago
via Jenkins JIRA by alexandergeorge, 1 year ago
This exception has no message.
via Jenkins JIRA by digash, 1 year ago
via Jenkins JIRA by alexandergeorge, 1 year ago
This exception has no message.
via hudson-ci.org by Unknown author, 1 year ago
This exception has no message.
via GitHub by rickywu
, 7 months ago
This exception has no message.
java.lang.NullPointerException: 	at java.util.Hashtable.put(Hashtable.java:394)	at java.util.Hashtable.putAll(Hashtable.java:466)	at hudson.maven.MavenBuilder.call(MavenBuilder.java:156)	at hudson.maven.MavenModuleSetBuild$Builder.call(MavenModuleSetBuild.java:688)	at hudson.maven.MavenModuleSetBuild$Builder.call(MavenModuleSetBuild.java:632)	at hudson.remoting.UserRequest.perform(UserRequest.java:114)	at hudson.remoting.UserRequest.perform(UserRequest.java:48)	at hudson.remoting.Request$2.run(Request.java:270)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)	at java.util.concurrent.FutureTask.run(FutureTask.java:138)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)	at java.lang.Thread.run(Thread.java:619)