Program: 102472
Project: 102472
Buggy source:
/** 
 * Generates ActionBuilder base on the action name and arguments list. Example: invokes reverse("show.topic", new HashMap<String, Object>{topicId, "topicId321"}) method. 
 * @param action
 * @param args
 * @return
 */
public static ActionBuilder reverse(String action,Map<String,Object> args){
  Map<String,Object> argsbackup=new HashMap<String,Object>(args);
  for (  Route route : routes) {
    if (route.actionPattern != null) {
      ExoMatcher matcher=route.actionPattern.matcher(action);
      if (matcher.matches()) {
        for (        String group : route.actionArgs) {
          String v=matcher.group(group);
          if (v == null) {
            continue;
          }
          args.put(group,v.toLowerCase());
        }
        List<String> inPathArgs=new ArrayList<String>(16);
        boolean allRequiredArgsAreHere=true;
        for (        Route.ParamArg arg : route.args) {
          inPathArgs.add(arg.name);
          Object value=args.get(arg.name);
          if (value != null) {
            if (!value.toString().startsWith("String_Node_Str") && !arg.constraint.matches(value.toString())) {
              allRequiredArgsAreHere=false;
              break;
            }
          }
        }
        if (allRequiredArgsAreHere) {
          StringBuilder queryString=new StringBuilder();
          String path=route.path;
          if (path.endsWith("String_Node_Str")) {
            path=path.substring(0,path.length() - 2);
          }
          for (          Map.Entry<String,Object> entry : args.entrySet()) {
            String key=entry.getKey();
            Object value=entry.getValue();
            if (inPathArgs.contains(key) && value != null) {
              path=path.replaceAll("String_Node_Str" + key + "String_Node_Str",value.toString().replace("String_Node_Str","String_Node_Str").replace("String_Node_Str","String_Node_Str").replace("String_Node_Str","String_Node_Str"));
            }
 else             if (value != null) {
              try {
                queryString.append(URLEncoder.encode(key,"String_Node_Str"));
                queryString.append("String_Node_Str");
                if (value.toString().startsWith("String_Node_Str")) {
                  queryString.append(value.toString());
                }
 else {
                  queryString.append(URLEncoder.encode(value.toString() + "String_Node_Str","String_Node_Str"));
                }
                queryString.append("String_Node_Str");
              }
 catch (              UnsupportedEncodingException ex) {
              }
            }
          }
          String qs=queryString.toString();
          if (qs.endsWith("String_Node_Str")) {
            qs=qs.substring(0,qs.length() - 1);
          }
          ActionBuilder actionDefinition=new ActionBuilder();
          actionDefinition.url=qs.length() == 0 ? path : path + "String_Node_Str" + qs;
          actionDefinition.action=action;
          actionDefinition.args=argsbackup;
          return actionDefinition;
        }
      }
    }
  }
  return null;
}

Fixed version (ground truth):
/** 
 * Generates ActionBuilder base on the action name and arguments list. Example: invokes reverse("show.topic", new HashMap<String, Object>{topicId, "topicId321"}) method. 
 * @param action
 * @param args
 * @return
 */
public static ActionBuilder reverse(String action,Map<String,Object> args){
  Map<String,Object> argsbackup=new HashMap<String,Object>(args);
  for (  Route route : routes) {
    if (route.actionPattern != null) {
      ExoMatcher matcher=route.actionPattern.matcher(action);
      if (matcher.matches()) {
        for (        String group : route.actionArgs) {
          String v=matcher.group(group);
          if (v == null) {
            continue;
          }
          args.put(group,v.toLowerCase());
        }
        List<String> inPathArgs=new ArrayList<String>(16);
        boolean allRequiredArgsAreHere=true;
        for (        Route.ParamArg arg : route.args) {
          inPathArgs.add(arg.name);
          Object value=args.get(arg.name);
          if (value != null) {
            if (!value.toString().startsWith("String_Node_Str") && !arg.constraint.matches(value.toString())) {
              allRequiredArgsAreHere=false;
              break;
            }
          }
        }
        if (allRequiredArgsAreHere) {
          StringBuilder queryString=new StringBuilder();
          String path=route.path;
          if (path.endsWith("String_Node_Str")) {
            path=path.substring(0,path.length() - 2);
          }
          for (          Map.Entry<String,Object> entry : args.entrySet()) {
            String key=entry.getKey();
            Object value=entry.getValue();
            if (inPathArgs.contains(key) && value != null) {
              path=path.replaceAll("String_Node_Str" + key + "String_Node_Str",value.toString().replace("String_Node_Str","String_Node_Str").replace("String_Node_Str","String_Node_Str").replace("String_Node_Str","String_Node_Str"));
            }
 else             if (value != null) {
              try {
                queryString.append(URLEncoder.encode(key,"String_Node_Str"));
                queryString.append("String_Node_Str");
                if (value.toString().startsWith("String_Node_Str")) {
                  queryString.append(value.toString());
                }
 else {
                  queryString.append(URLEncoder.encode(value.toString() + "String_Node_Str","String_Node_Str"));
                }
                queryString.append("String_Node_Str");
              }
 catch (              UnsupportedEncodingException ex) {
                LOG.debug("String_Node_Str" + ex);
              }
            }
          }
          String qs=queryString.toString();
          if (qs.endsWith("String_Node_Str")) {
            qs=qs.substring(0,qs.length() - 1);
          }
          ActionBuilder actionDefinition=new ActionBuilder();
          actionDefinition.url=qs.length() == 0 ? path : path + "String_Node_Str" + qs;
          actionDefinition.action=action;
          actionDefinition.args=argsbackup;
          return actionDefinition;
        }
      }
    }
  }
  return null;
}