NPE when running 'mvn -Prun-its verify`

[rhuss]

When using mvn _X -Prun-its verify I get a NPE:

ERROR] Failed to execute goal org.apache.maven.plugins:maven-invoker-plugin:1.7:integration-test (integration-test) on project docker-maven-plugin: Execution integration-test of goal org.apache.maven.plugins:maven-invoker-plugin:1.7:integration-test failed. NullPointerException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-invoker-plugin:1.7:integration-test (integration-test) on project docker-maven-plugin: Execution integration-test of goal org.apache.maven.plugins:maven-invoker-plugin:1.7:integration-test failed.
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:224)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:108)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:76)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:116)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:361)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:155)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:584)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:213)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:157)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    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)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution integration-test of goal org.apache.maven.plugins:maven-invoker-plugin:1.7:integration-test failed.
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:144)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
    ... 19 more
Caused by: java.lang.NullPointerException
    at java.util.Hashtable.put(Hashtable.java:514)
    at java.util.Hashtable.putAll(Hashtable.java:587)
    at org.apache.maven.plugin.invoker.AbstractInvokerMojo.getSystemProperties(AbstractInvokerMojo.java:1582)
    at org.apache.maven.plugin.invoker.AbstractInvokerMojo.runBuild(AbstractInvokerMojo.java:1470)
    at org.apache.maven.plugin.invoker.AbstractInvokerMojo.runBuild(AbstractInvokerMojo.java:1214)
    at org.apache.maven.plugin.invoker.AbstractInvokerMojo.runBuilds(AbstractInvokerMojo.java:1133)
    at org.apache.maven.plugin.invoker.AbstractInvokerMojo.execute(AbstractInvokerMojo.java:670)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:133)
    ... 20 more

Is this a bug or how can I run the example ?

[alexec]

run with -Ddocker.password=yourpasswordifyouhaveoneornothingotherwise

[rhuss]

Ok, I understand. Since you username and email is hardcoded in the example, I probably would have to override docker.username as well in the invoker configuration. BTW, maybe you should switch to 2375 as the default port for the Docker Host.