Program: 91738
Project: 91738
Buggy source:
public RepositoryResponse postTaskData(TaskData taskData,Set<TaskAttribute> oldAttributes,TaskRepository repository,IOperationMonitor monitor) throws OSIORestException {
  TaskAttribute spaceIdAttribute=taskData.getRoot().getAttribute(OSIORestTaskSchema.getDefault().SPACE_ID.getKey());
  String spaceId=spaceIdAttribute.getValue();
  Space space=null;
  if (taskData.isNew()) {
    Map<String,Space> spaces=getCachedSpaces(new NullOperationMonitor());
    for (    Space s : spaces.values()) {
      if (s.getId().equals(spaceId)) {
        space=s;
        break;
      }
    }
    String id=null;
    try {
      id=new OSIORestPostNewTask(client,taskData,space,connector,repository).run(monitor);
    }
 catch (    CoreException e1) {
      throw new OSIORestException(e1);
    }
    return new RepositoryResponse(ResponseKind.TASK_CREATED,id);
  }
 else {
    OSIORestConfiguration config;
    try {
      config=connector.getRepositoryConfiguration(repository);
    }
 catch (    CoreException e1) {
      throw new OSIORestException(e1);
    }
    TaskAttribute newComment=taskData.getRoot().getAttribute(OSIORestTaskSchema.getDefault().NEW_COMMENT.getKey());
    if (newComment != null) {
      String value=newComment.getValue();
      if (value != null && !value.isEmpty()) {
        new OSIORestPostNewCommentTask(client,taskData,oldAttributes).run(monitor);
        newComment.setValue("String_Node_Str");
      }
    }
    Map<String,Space> spaces=config.getSpaces();
    for (    Space s : spaces.values()) {
      if (s.getId().equals(spaceId)) {
        space=s;
        break;
      }
    }
    if (space == null) {
      Map<String,Space> externalSpaces=config.getExternalSpaces();
      for (      Space s : externalSpaces.values()) {
        if (s.getId().equals(spaceId)) {
          space=s;
          break;
        }
      }
    }
    TaskAttribute removeLinks=taskData.getRoot().getAttribute(OSIORestTaskSchema.getDefault().REMOVE_LINKS.getKey());
    if (removeLinks != null) {
      List<String> links=removeLinks.getValues();
      TaskAttributeMetaData metadata=removeLinks.getMetaData();
      TaskAttribute widAttr=taskData.getRoot().getAttribute(OSIORestTaskSchema.getDefault().UUID.getKey());
      String wid=widAttr.getValue();
      for (      String link : links) {
        try {
          String id=metadata.getValue(link);
          new OSIORestDeleteLink(client,wid,id).run(monitor);
        }
 catch (        Exception e) {
          StatusHandler.log(new Status(IStatus.ERROR,OSIORestCore.ID_PLUGIN,NLS.bind("String_Node_Str",link),e));
        }
      }
    }
    TaskAttribute addLink=taskData.getRoot().getAttribute(OSIORestTaskSchema.getDefault().ADD_LINK.getKey());
    TaskAttributeMetaData metadata=addLink.getMetaData();
    String linkid=metadata.getValue("String_Node_Str");
    String sourceid=taskData.getRoot().getAttribute(OSIORestTaskSchema.getDefault().UUID.getKey()).getValue();
    String targetid=metadata.getValue("String_Node_Str");
    String direction=metadata.getValue("String_Node_Str");
    boolean isForward=true;
    if (direction != null && !direction.isEmpty()) {
      isForward=direction.equals("String_Node_Str");
    }
    if (linkid != null && targetid != null) {
      new OSIORestPostNewLink(client,linkid,sourceid,targetid,isForward).run(monitor);
    }
    new OSIORestPatchUpdateTask(client,taskData,oldAttributes,space).run(monitor);
    return new RepositoryResponse(ResponseKind.TASK_UPDATED,taskData.getTaskId());
  }
}

Fixed version (ground truth):
public RepositoryResponse postTaskData(TaskData taskData,Set<TaskAttribute> oldAttributes,TaskRepository repository,IOperationMonitor monitor) throws OSIORestException {
  TaskAttribute spaceIdAttribute=taskData.getRoot().getAttribute(OSIORestTaskSchema.getDefault().SPACE_ID.getKey());
  String spaceId=spaceIdAttribute.getValue();
  Space space=null;
  if (taskData.isNew()) {
    Map<String,Space> spaces=getCachedSpaces(new NullOperationMonitor());
    for (    Space s : spaces.values()) {
      if (s.getId().equals(spaceId)) {
        space=s;
        break;
      }
    }
    String id=null;
    try {
      id=new OSIORestPostNewTask(client,taskData,space,connector,repository).run(monitor);
    }
 catch (    CoreException e1) {
      throw new OSIORestException(e1);
    }
    return new RepositoryResponse(ResponseKind.TASK_CREATED,id);
  }
 else {
    OSIORestConfiguration config;
    try {
      config=connector.getRepositoryConfiguration(repository);
      space=getSpaceById(spaceId,repository);
    }
 catch (    CoreException e1) {
      throw new OSIORestException(e1);
    }
    TaskAttribute newComment=taskData.getRoot().getAttribute(OSIORestTaskSchema.getDefault().NEW_COMMENT.getKey());
    if (newComment != null) {
      String value=newComment.getValue();
      if (value != null && !value.isEmpty()) {
        new OSIORestPostNewCommentTask(client,taskData,oldAttributes).run(monitor);
        newComment.setValue("String_Node_Str");
      }
    }
    TaskAttribute removeLinks=taskData.getRoot().getAttribute(OSIORestTaskSchema.getDefault().REMOVE_LINKS.getKey());
    if (removeLinks != null) {
      List<String> links=removeLinks.getValues();
      TaskAttributeMetaData metadata=removeLinks.getMetaData();
      TaskAttribute widAttr=taskData.getRoot().getAttribute(OSIORestTaskSchema.getDefault().UUID.getKey());
      String wid=widAttr.getValue();
      for (      String link : links) {
        try {
          String id=metadata.getValue(link);
          new OSIORestDeleteLink(client,wid,id).run(monitor);
        }
 catch (        Exception e) {
          StatusHandler.log(new Status(IStatus.ERROR,OSIORestCore.ID_PLUGIN,NLS.bind("String_Node_Str",link),e));
        }
      }
    }
    TaskAttribute addLink=taskData.getRoot().getAttribute(OSIORestTaskSchema.getDefault().ADD_LINK.getKey());
    TaskAttributeMetaData metadata=addLink.getMetaData();
    String linkid=metadata.getValue("String_Node_Str");
    String sourceid=taskData.getRoot().getAttribute(OSIORestTaskSchema.getDefault().UUID.getKey()).getValue();
    String targetid=metadata.getValue("String_Node_Str");
    String direction=metadata.getValue("String_Node_Str");
    boolean isForward=true;
    if (direction != null && !direction.isEmpty()) {
      isForward=direction.equals("String_Node_Str");
    }
    if (linkid != null && targetid != null) {
      new OSIORestPostNewLink(client,linkid,sourceid,targetid,isForward).run(monitor);
    }
    new OSIORestPatchUpdateTask(client,taskData,oldAttributes,space).run(monitor);
    return new RepositoryResponse(ResponseKind.TASK_UPDATED,taskData.getTaskId());
  }
}