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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.

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java.lang.NullPointerException: 	at java.util.Hashtable.put(Hashtable.java:459)	at org.codehaus.plexus.interpolation.os.OperatingSystemUtils.getSystemEnvVars(OperatingSystemUtils.java:73)	at org.codehaus.plexus.interpolation.EnvarBasedValueSource.getEnvars(EnvarBasedValueSource.java:74)	at org.codehaus.plexus.interpolation.EnvarBasedValueSource.(EnvarBasedValueSource.java:64)	at org.codehaus.plexus.interpolation.EnvarBasedValueSource.(EnvarBasedValueSource.java:50)	at org.apache.maven.settings.building.DefaultSettingsBuilder.interpolate(DefaultSettingsBuilder.java:226)	at org.apache.maven.settings.building.DefaultSettingsBuilder.build(DefaultSettingsBuilder.java:104)	at org.apache.maven.cli.configuration.SettingsXmlConfigurationProcessor.process(SettingsXmlConfigurationProcessor.java:137)	at org.apache.maven.cli.MavenCli.configure(MavenCli.java:1017)	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:283)	at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)