Program: 93567
Project: 93567
Buggy source:
/** 
 * @param href
 * @param exchange
 * @param context
 * @param data
 * @return
 * @throws IllegalQueryParamenterException
 */
public static Representation getDocument(String href,HttpServerExchange exchange,RequestContext context,DBObject data) throws IllegalQueryParamenterException {
  Representation rep;
  Object id=data.get("String_Node_Str");
  if (id == null) {
    rep=new Representation("String_Node_Str");
  }
 else   if (id instanceof Integer) {
    rep=new Representation(href + "String_Node_Str" + DOC_ID_TYPE.INT);
  }
 else   if (id instanceof Long) {
    rep=new Representation(href + "String_Node_Str" + DOC_ID_TYPE.LONG);
  }
 else   if (id instanceof Float) {
    rep=new Representation(href + "String_Node_Str" + DOC_ID_TYPE.FLOAT);
  }
 else   if (id instanceof Double) {
    rep=new Representation(href + "String_Node_Str" + DOC_ID_TYPE.DOUBLE);
  }
 else {
    rep=new Representation("String_Node_Str");
    rep.addWarning("String_Node_Str" + id.getClass().getSimpleName());
  }
  rep.addProperty("String_Node_Str",context.getType().name());
  data.keySet().stream().forEach((key) -> rep.addProperty(key,data.get(key)));
  TreeMap<String,String> links;
  links=getRelationshipsLinks(rep,context,data);
  if (links != null) {
    links.keySet().stream().forEach((k) -> {
      rep.addLink(new Link(k,links.get(k)));
    }
);
  }
  String requestPath=URLUtils.removeTrailingSlashes(exchange.getRequestPath());
  if (context.isParentAccessible()) {
    rep.addLink(new Link("String_Node_Str",URLUtils.getParentPath(requestPath)));
  }
  rep.addLink(new Link("String_Node_Str","String_Node_Str",Configuration.RESTHEART_ONLINE_DOC_URL + "String_Node_Str",false),true);
  return rep;
}

Fixed version (ground truth):
/** 
 * @param href
 * @param exchange
 * @param context
 * @param data
 * @return
 * @throws IllegalQueryParamenterException
 */
public static Representation getDocument(String href,HttpServerExchange exchange,RequestContext context,DBObject data) throws IllegalQueryParamenterException {
  Representation rep;
  Object id=data.get("String_Node_Str");
  if (id == null) {
    rep=new Representation("String_Node_Str");
  }
 else   if (id instanceof String || id instanceof ObjectId) {
    rep=new Representation(href);
  }
 else   if (id instanceof Integer) {
    rep=new Representation(href + "String_Node_Str" + DOC_ID_TYPE.INT);
  }
 else   if (id instanceof Long) {
    rep=new Representation(href + "String_Node_Str" + DOC_ID_TYPE.LONG);
  }
 else   if (id instanceof Float) {
    rep=new Representation(href + "String_Node_Str" + DOC_ID_TYPE.FLOAT);
  }
 else   if (id instanceof Double) {
    rep=new Representation(href + "String_Node_Str" + DOC_ID_TYPE.DOUBLE);
  }
 else {
    rep=new Representation("String_Node_Str");
    rep.addWarning("String_Node_Str" + id.getClass().getSimpleName());
  }
  rep.addProperty("String_Node_Str",context.getType().name());
  data.keySet().stream().forEach((key) -> rep.addProperty(key,data.get(key)));
  TreeMap<String,String> links;
  links=getRelationshipsLinks(rep,context,data);
  if (links != null) {
    links.keySet().stream().forEach((k) -> {
      rep.addLink(new Link(k,links.get(k)));
    }
);
  }
  String requestPath=URLUtils.removeTrailingSlashes(exchange.getRequestPath());
  if (context.isParentAccessible()) {
    rep.addLink(new Link("String_Node_Str",URLUtils.getParentPath(requestPath)));
  }
  rep.addLink(new Link("String_Node_Str","String_Node_Str",Configuration.RESTHEART_ONLINE_DOC_URL + "String_Node_Str",false),true);
  return rep;
}