Github user stain commented on a diff in the pull request:

    
https://github.com/apache/incubator-taverna-common-activities/pull/13#discussion_r70511738
  
    --- Diff: 
taverna-cwl-activity/src/main/java/org/apache/taverna/cwl/CwlActivityFactory.java
 ---
    @@ -0,0 +1,102 @@
    +/*
    +* Licensed to the Apache Software Foundation (ASF) under one
    +* or more contributor license agreements. See the NOTICE file
    +* distributed with this work for additional information
    +* regarding copyright ownership. The ASF licenses this file
    +* to you under the Apache License, Version 2.0 (the
    +* "License"); you may not use this file except in compliance
    +* with the License. You may obtain a copy of the License at
    +*
    +* http://www.apache.org/licenses/LICENSE-2.0
    +*
    +* Unless required by applicable law or agreed to in writing,
    +* software distributed under the License is distributed on an
    +* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    +* KIND, either express or implied. See the License for the
    +* specific language governing permissions and limitations
    +* under the License.
    +*/
    +package org.apache.taverna.cwl;
    +
    +import java.net.URI;
    +import java.util.HashMap;
    +import java.util.HashSet;
    +import java.util.Set;
    +
    +import org.apache.log4j.Logger;
    +import org.apache.taverna.cwl.utilities.CWLUtil;
    +import org.apache.taverna.workflowmodel.Edits;
    +import org.apache.taverna.workflowmodel.processor.activity.Activity;
    +import 
org.apache.taverna.workflowmodel.processor.activity.ActivityConfigurationException;
    +import org.apache.taverna.workflowmodel.processor.activity.ActivityFactory;
    +import 
org.apache.taverna.workflowmodel.processor.activity.ActivityInputPort;
    +import 
org.apache.taverna.workflowmodel.processor.activity.ActivityOutputPort;
    +
    +import com.fasterxml.jackson.databind.JsonNode;
    +
    +public class CwlActivityFactory implements ActivityFactory {
    +   private static Logger logger = 
Logger.getLogger(CwlActivityFactory.class);
    +   private static final int DEPTH_0 = 0;
    +   private static final int DEPTH_1 = 1;
    +   private Edits edits;
    +
    +   @Override
    +   public Activity<?> createActivity() {
    +           CwlDumyActivity activity = new CwlDumyActivity();
    +           activity.setEdits(edits);
    +           return activity;
    +   }
    +
    +   @Override
    +   public URI getActivityType() {
    +           return null;
    --- End diff --
    
    The `getActivityType()` can't be null, this is used to match up the factory 
from the SCUFL2 workflow and when adding from the service provider. So as 
mentioned above, perhaps just return 
`URI.create("https://taverna.apache.org/ns/2016/activity/cwl";)` ? 


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