Caused by: java.lang.NullPointerException
        at org.picocontainer.DefaultPicoContainer.addComponent(DefaultPicoContainer.java:441)
        at org.picocontainer.DefaultPicoContainer.access$400(DefaultPicoContainer.java:78)
        at org.picocontainer.DefaultPicoContainer$AsPropertiesPicoContainer.addComponent(DefaultPicoContainer.java:1023)
        at org.sonar.batch.BatchMojo.createMainContainer(BatchMojo.java:157)
        at org.sonar.batch.BatchMojo.executeBatch(BatchMojo.java:135)
        at org.sonar.batch.BatchMojo.execute(BatchMojo.java:130)
        at org.codehaus.mojo.sonar.Bootstraper.executeMojo(Bootstraper.java:113)