Program: 6704
Project: 6704
Buggy source:
@Override public void initialize(MapReduceTaskContext context) throws Exception {
  context.getSpecification().getProperties();
  Map<String,String> properties=context.getSpecification().getProperties();
  String sourcePluginId=properties.get(Constants.Source.PLUGINID);
  String transformInfosStr=properties.get(Constants.Transform.PLUGINIDS);
  Preconditions.checkNotNull(transformInfosStr,"String_Node_Str");
  List<TransformInfo> transformInfos=GSON.fromJson(transformInfosStr,TRANSFORMDETAILS_LIST_TYPE);
  List<TransformDetail> pipeline=Lists.newArrayListWithCapacity(transformInfos.size() + 2);
  BatchSource source=context.newInstance(sourcePluginId);
  BatchRuntimeContext runtimeContext=new MapReduceRuntimeContext(context,mapperMetrics,sourcePluginId);
  source.initialize(runtimeContext);
  pipeline.add(new TransformDetail(sourcePluginId,source,new StageMetrics(mapperMetrics,PluginID.from(sourcePluginId))));
  addTransforms(pipeline,transformInfos,context);
  Context hadoopContext=(Context)context.getHadoopContext();
  String sinkOutputsStr=hadoopContext.getConfiguration().get(SINK_OUTPUTS_KEY);
  Preconditions.checkNotNull(sinkOutputsStr,"String_Node_Str");
  Map<String,Set<String>> sinkOutputs=GSON.fromJson(sinkOutputsStr,SINK_OUTPUTS_TYPE);
  sinks=new ArrayList<>(sinkOutputs.size());
  for (  Map.Entry<String,Set<String>> sinkOutput : sinkOutputs.entrySet()) {
    String sinkPluginId=sinkOutput.getKey();
    Set<String> sinkOutputNames=sinkOutput.getValue();
    BatchSink<Object,Object,Object> sink=context.newInstance(sinkPluginId);
    runtimeContext=new MapReduceRuntimeContext(context,mapperMetrics,sinkPluginId);
    sink.initialize(runtimeContext);
    sinks.add(new WrappedSink<>(sinkPluginId,sink,sinkOutputNames,context,mapperMetrics));
  }
  transformExecutor=new TransformExecutor<>(pipeline);
}

Fixed version (ground truth):
@Override public void initialize(MapReduceTaskContext<Object,Object> context) throws Exception {
  context.getSpecification().getProperties();
  Map<String,String> properties=context.getSpecification().getProperties();
  String sourcePluginId=properties.get(Constants.Source.PLUGINID);
  String transformInfosStr=properties.get(Constants.Transform.PLUGINIDS);
  Preconditions.checkNotNull(transformInfosStr,"String_Node_Str");
  List<TransformInfo> transformInfos=GSON.fromJson(transformInfosStr,TRANSFORMDETAILS_LIST_TYPE);
  List<TransformDetail> pipeline=Lists.newArrayListWithCapacity(transformInfos.size() + 2);
  BatchSource source=context.newInstance(sourcePluginId);
  BatchRuntimeContext runtimeContext=new MapReduceRuntimeContext(context,mapperMetrics,sourcePluginId);
  source.initialize(runtimeContext);
  pipeline.add(new TransformDetail(sourcePluginId,source,new StageMetrics(mapperMetrics,PluginID.from(sourcePluginId))));
  addTransforms(pipeline,transformInfos,context);
  Context hadoopContext=context.getHadoopContext();
  String sinkOutputsStr=hadoopContext.getConfiguration().get(SINK_OUTPUTS_KEY);
  Preconditions.checkNotNull(sinkOutputsStr,"String_Node_Str");
  Map<String,Set<String>> sinkOutputs=GSON.fromJson(sinkOutputsStr,SINK_OUTPUTS_TYPE);
  boolean hasOneOutput=hasOneOutput(transformInfos,sinkOutputs);
  sinks=new ArrayList<>(sinkOutputs.size());
  for (  Map.Entry<String,Set<String>> sinkOutput : sinkOutputs.entrySet()) {
    String sinkPluginId=sinkOutput.getKey();
    Set<String> sinkOutputNames=sinkOutput.getValue();
    BatchSink<Object,Object,Object> sink=context.newInstance(sinkPluginId);
    runtimeContext=new MapReduceRuntimeContext(context,mapperMetrics,sinkPluginId);
    sink.initialize(runtimeContext);
    if (hasOneOutput) {
      sinks.add(new SingleOutputSink<>(sinkPluginId,sink,context,mapperMetrics));
    }
 else {
      sinks.add(new MultiOutputSink<>(sinkPluginId,sink,context,mapperMetrics,sinkOutputNames));
    }
  }
  transformExecutor=new TransformExecutor<>(pipeline);
}