Program: 41501
Project: 41501
Buggy source:
public References getRefs(final UriInfo uriInfo,String state){
  final References refs=new References();
  final IInstanceDataService service=InstanceDataServiceHandler.getInstanceDataService();
  final URI serviceInstanceIDtoURI=IdConverter.serviceInstanceIDtoURI(this.serviceTemplateInstanceId);
  try {
    final List<SimpleXLink> serviceInstanceLinks=new LinkedList<>();
    serviceInstanceLinks.add(LinkBuilder.selfLink(uriInfo));
    final List<ServiceInstance> serviceInstances=service.getServiceInstances(serviceInstanceIDtoURI,null,null);
    final ServiceInstance serviceInstance=serviceInstances.get(0);
    final List<NodeInstance> nodeInstances=service.getNodeInstances(null,null,null,serviceInstanceIDtoURI);
    final List<SimpleXLink> nodeInstanceLinks=new LinkedList<>();
    for (    final NodeInstance nodeInstance : nodeInstances) {
      if (state != null && !nodeInstance.getState().equals(State.Node.valueOf(state))) {
        continue;
      }
      final QName nodeId=nodeInstance.getNodeTemplateID();
      final int nodeInstanceId=nodeInstance.getId();
      if (this.nodeTemplateID.toString().equalsIgnoreCase(nodeId.toString()) || this.nodeTemplateID.toString().equalsIgnoreCase(nodeId.getLocalPart())) {
        final Reference ref=new Reference(Utilities.buildURI(uriInfo,String.valueOf(nodeInstanceId)),XLinkConstants.SIMPLE,String.valueOf(nodeInstanceId));
        refs.getReference().add(ref);
        this.log.debug("String_Node_Str",ref.getXhref());
      }
 else {
        this.log.debug("String_Node_Str",nodeInstanceId,nodeId);
      }
    }
    final NodeInstanceList nil=new NodeInstanceList(null,nodeInstanceLinks);
    final ServiceInstanceEntry sie=new ServiceInstanceEntry(serviceInstance,serviceInstanceLinks,nil);
    refs.getReference().add(new Reference(uriInfo.getAbsolutePath().toString(),XLinkConstants.SIMPLE,XLinkConstants.SELF));
    return refs;
  }
 catch (  final Exception e) {
    e.printStackTrace();
    return null;
  }
}

Fixed version (ground truth):
public References getRefs(final UriInfo uriInfo,String state){
  final References refs=new References();
  final IInstanceDataService service=InstanceDataServiceHandler.getInstanceDataService();
  final URI serviceInstanceIDtoURI=IdConverter.serviceInstanceIDtoURI(this.serviceTemplateInstanceId);
  List<String> states=new ArrayList<>();
  if (state != null && !state.isEmpty()) {
    if (state.contains("String_Node_Str")) {
      for (      String split : state.split("String_Node_Str")) {
        if (!split.trim().isEmpty()) {
          states.add(split.trim());
        }
      }
    }
 else     if (!state.isEmpty()) {
      states.add(state);
    }
  }
  try {
    final List<SimpleXLink> serviceInstanceLinks=new LinkedList<>();
    serviceInstanceLinks.add(LinkBuilder.selfLink(uriInfo));
    final List<ServiceInstance> serviceInstances=service.getServiceInstances(serviceInstanceIDtoURI,null,null);
    final ServiceInstance serviceInstance=serviceInstances.get(0);
    final List<NodeInstance> nodeInstances=service.getNodeInstances(null,null,null,serviceInstanceIDtoURI);
    final List<SimpleXLink> nodeInstanceLinks=new LinkedList<>();
    for (    final NodeInstance nodeInstance : nodeInstances) {
      if (!states.isEmpty() && !states.contains(nodeInstance.getState().toString())) {
        continue;
      }
      final QName nodeId=nodeInstance.getNodeTemplateID();
      final int nodeInstanceId=nodeInstance.getId();
      if (this.nodeTemplateID.toString().equalsIgnoreCase(nodeId.toString()) || this.nodeTemplateID.toString().equalsIgnoreCase(nodeId.getLocalPart())) {
        final Reference ref=new Reference(Utilities.buildURI(uriInfo,String.valueOf(nodeInstanceId)),XLinkConstants.SIMPLE,String.valueOf(nodeInstanceId));
        refs.getReference().add(ref);
        this.log.debug("String_Node_Str",ref.getXhref());
      }
 else {
        this.log.debug("String_Node_Str",nodeInstanceId,nodeId);
      }
    }
    final NodeInstanceList nil=new NodeInstanceList(null,nodeInstanceLinks);
    final ServiceInstanceEntry sie=new ServiceInstanceEntry(serviceInstance,serviceInstanceLinks,nil);
    refs.getReference().add(new Reference(uriInfo.getAbsolutePath().toString(),XLinkConstants.SIMPLE,XLinkConstants.SELF));
    return refs;
  }
 catch (  final Exception e) {
    e.printStackTrace();
    return null;
  }
}