Program: 4726
Project: 4726
Buggy source:
@Override public void initialize(WorkflowContext context) throws Exception {
  super.initialize(context);
  String arguments=Joiner.on("String_Node_Str").withKeyValueSeparator("String_Node_Str").join(context.getRuntimeArguments());
  WRAPPERLOGGER.info("String_Node_Str",context.getApplicationSpecification().getName(),UserGroupInformation.getCurrentUser().getShortUserName(),arguments);
  alertPublishers=new HashMap<>();
  postActions=new LinkedHashMap<>();
  spec=GSON.fromJson(context.getWorkflowSpecification().getProperty(Constants.PIPELINE_SPEC_KEY),BatchPipelineSpec.class);
  stageSpecs=new HashMap<>();
  MacroEvaluator macroEvaluator=new DefaultMacroEvaluator(context.getToken(),context.getRuntimeArguments(),context.getLogicalStartTime(),context,context.getNamespace());
  PipelineRuntime pipelineRuntime=new PipelineRuntime(context,workflowMetrics);
  PluginContext pluginContext=new PipelinePluginContext(context,workflowMetrics,spec.isStageLoggingEnabled(),spec.isProcessTimingEnabled());
  for (  ActionSpec actionSpec : spec.getEndingActions()) {
    String stageName=actionSpec.getName();
    postActions.put(stageName,(PostAction)pluginContext.newPluginInstance(stageName,macroEvaluator));
    stageSpecs.put(stageName,StageSpec.builder(stageName,actionSpec.getPluginSpec()).setStageLoggingEnabled(spec.isStageLoggingEnabled()).setProcessTimingEnabled(spec.isProcessTimingEnabled()).build());
  }
  for (  StageSpec stageSpec : spec.getStages()) {
    String stageName=stageSpec.getName();
    stageSpecs.put(stageName,stageSpec);
    if (AlertPublisher.PLUGIN_TYPE.equals(stageSpec.getPluginType())) {
      AlertPublisher alertPublisher=context.newPluginInstance(stageName,macroEvaluator);
      AlertPublisherContext alertContext=new DefaultAlertPublisherContext(pipelineRuntime,stageSpec,context,context.getAdmin());
      alertPublisher.initialize(alertContext);
      alertPublishers.put(stageName,alertPublisher);
    }
  }
  WRAPPERLOGGER.info("String_Node_Str",context.getApplicationSpecification().getName());
}

Fixed version (ground truth):
@Override public void initialize(WorkflowContext context) throws Exception {
  super.initialize(context);
  String arguments=Joiner.on("String_Node_Str").withKeyValueSeparator("String_Node_Str").join(context.getRuntimeArguments());
  WRAPPERLOGGER.info("String_Node_Str",context.getApplicationSpecification().getName(),UserGroupInformation.getCurrentUser().getShortUserName(),arguments);
  alertPublishers=new HashMap<>();
  postActions=new LinkedHashMap<>();
  spec=GSON.fromJson(context.getWorkflowSpecification().getProperty(Constants.PIPELINE_SPEC_KEY),BatchPipelineSpec.class);
  stageSpecs=new HashMap<>();
  MacroEvaluator macroEvaluator=new DefaultMacroEvaluator(context.getToken(),context.getRuntimeArguments(),context.getLogicalStartTime(),context,context.getNamespace());
  PluginContext pluginContext=new PipelinePluginContext(context,workflowMetrics,spec.isStageLoggingEnabled(),spec.isProcessTimingEnabled());
  for (  ActionSpec actionSpec : spec.getEndingActions()) {
    String stageName=actionSpec.getName();
    postActions.put(stageName,(PostAction)pluginContext.newPluginInstance(stageName,macroEvaluator));
    stageSpecs.put(stageName,StageSpec.builder(stageName,actionSpec.getPluginSpec()).setStageLoggingEnabled(spec.isStageLoggingEnabled()).setProcessTimingEnabled(spec.isProcessTimingEnabled()).build());
  }
  for (  StageSpec stageSpec : spec.getStages()) {
    String stageName=stageSpec.getName();
    stageSpecs.put(stageName,stageSpec);
    if (AlertPublisher.PLUGIN_TYPE.equals(stageSpec.getPluginType())) {
      AlertPublisher alertPublisher=context.newPluginInstance(stageName,macroEvaluator);
      alertPublishers.put(stageName,alertPublisher);
    }
  }
  WRAPPERLOGGER.info("String_Node_Str",context.getApplicationSpecification().getName());
}