Stack trace is: java.lang.NullPointerException at org.codehaus.groovy.tools.groovydoc.SimpleGroovyClassDocAssembler.getJavaDocCommentsBeforeNode(SimpleGroovyClassDocAssembler.java:162) at org.codehaus.groovy.tools.groovydoc.SimpleGroovyClassDocAssembler.visitClassDef(SimpleGroovyClassDocAssembler.java:102) at org.codehaus.groovy.antlr.treewalker.TraversalHelper.visitNode(TraversalHelper.java:82) at org.codehaus.groovy.antlr.treewalker.TraversalHelper.openingVisit(TraversalHelper.java:507) at org.codehaus.groovy.antlr.treewalker.TraversalHelper.accept_FirstChild_v_RestOfTheChildren(TraversalHelper.java:439) at org.codehaus.groovy.antlr.treewalker.SourceCodeTraversal.accept(SourceCodeTraversal.java:190) at org.codehaus.groovy.antlr.treewalker.TraversalHelper.process(TraversalHelper.java:530)