if(addedOperationInvocation != null) { CallTreeNode root = new CallTreeNode(mapper.getOperation1(), addedOperation, addedOperationInvocation); CallTree callTree = new CallTree(root); generateCallTree(addedOperation, root, callTree); UMLOperationBodyMapper operationBodyMapper = createMapperForExtractedMethod(mapper, mapper.getOperation1(), addedOperation, addedOperationInvocation);