Program: 15121
Project: 15121
Buggy source:
@Override public void incomingMessage(MessageEvent event) throws AuthenticationException {
  if (event.getMessage() instanceof MappingHttpRequest) {
    MappingHttpRequest httpRequest=(MappingHttpRequest)event.getMessage();
    Map<String,String> parameters=httpRequest.getParameters();
    if (!parameters.containsKey(SecurityParameter.Timestamp.toString()) && !parameters.containsKey(SecurityParameter.Expires.toString())) {
      throw new AuthenticationException("String_Node_Str" + SecurityParameter.Timestamp + "String_Node_Str"+ SecurityParameter.Expires);
    }
    Calendar now=null;
    Calendar expires=null;
    String timestamp=null;
    String exp=null;
    try {
      now=Calendar.getInstance();
      expires=null;
      if (parameters.containsKey(SecurityParameter.Timestamp.toString())) {
        timestamp=parameters.remove(SecurityParameter.Timestamp.toString());
        try {
          expires=Timestamps.parseTimestamp(timestamp);
        }
 catch (        Exception e) {
          expires=Timestamps.parseTimestamp(URLDecoder.decode(timestamp));
        }
        now.add(Calendar.SECOND,-20);
        if (now.before(expires)) {
          throw new AuthenticationException("String_Node_Str" + timestamp);
        }
        expires.add(Calendar.SECOND,880);
      }
 else {
        exp=parameters.remove(SecurityParameter.Expires.toString());
        try {
          expires=Timestamps.parseTimestamp(exp);
        }
 catch (        Exception e) {
          expires=Timestamps.parseTimestamp(URLDecoder.decode(exp));
        }
        Calendar cacheExpire=(Calendar)now.clone();
        cacheExpire.add(Calendar.MINUTE,15);
        if (expires.after(cacheExpire))         LOG.warn("String_Node_Str" + expires + "String_Node_Str");
      }
    }
 catch (    Throwable t) {
      LOG.debug(t,t);
      throw new AuthenticationException("String_Node_Str" + timestamp + "String_Node_Str"+ exp);
    }
    if (now.after(expires)) {
      expires.setTimeZone(TimeZone.getTimeZone("String_Node_Str"));
      String expiryTime=String.format("String_Node_Str",expires.get(Calendar.YEAR),expires.get(Calendar.MONTH) + 1,expires.get(Calendar.DAY_OF_MONTH) + 1,expires.get(Calendar.HOUR_OF_DAY),expires.get(Calendar.MINUTE),expires.get(Calendar.SECOND));
      throw new AuthenticationException("String_Node_Str" + timestamp + "String_Node_Str"+ exp+ "String_Node_Str"+ expiryTime);
    }
  }
}

Fixed version (ground truth):
@Override public void incomingMessage(MessageEvent event) throws AuthenticationException {
  if (event.getMessage() instanceof MappingHttpRequest) {
    MappingHttpRequest httpRequest=(MappingHttpRequest)event.getMessage();
    Map<String,String> parameters=httpRequest.getParameters();
    if (!parameters.containsKey(SecurityParameter.Timestamp.toString()) && !parameters.containsKey(SecurityParameter.Expires.toString())) {
      throw new AuthenticationException("String_Node_Str" + SecurityParameter.Timestamp + "String_Node_Str"+ SecurityParameter.Expires);
    }
    Calendar now=null;
    Calendar expires=null;
    String timestamp=null;
    String exp=null;
    try {
      now=Calendar.getInstance();
      expires=null;
      if (parameters.containsKey(SecurityParameter.Timestamp.toString())) {
        timestamp=parameters.remove(SecurityParameter.Timestamp.toString());
        try {
          expires=Timestamps.parseTimestamp(timestamp);
        }
 catch (        Exception e) {
          expires=Timestamps.parseTimestamp(URLDecoder.decode(timestamp));
        }
        now.add(Calendar.SECOND,20);
        if (now.before(expires)) {
          throw new AuthenticationException("String_Node_Str" + timestamp);
        }
        expires.add(Calendar.SECOND,920);
      }
 else {
        exp=parameters.remove(SecurityParameter.Expires.toString());
        try {
          expires=Timestamps.parseTimestamp(exp);
        }
 catch (        Exception e) {
          expires=Timestamps.parseTimestamp(URLDecoder.decode(exp));
        }
        Calendar cacheExpire=(Calendar)now.clone();
        cacheExpire.add(Calendar.MINUTE,15);
        if (expires.after(cacheExpire))         LOG.warn("String_Node_Str" + expires + "String_Node_Str");
      }
    }
 catch (    Throwable t) {
      LOG.debug(t,t);
      throw new AuthenticationException("String_Node_Str" + timestamp + "String_Node_Str"+ exp);
    }
    if (now.after(expires)) {
      expires.setTimeZone(TimeZone.getTimeZone("String_Node_Str"));
      String expiryTime=String.format("String_Node_Str",expires.get(Calendar.YEAR),expires.get(Calendar.MONTH) + 1,expires.get(Calendar.DAY_OF_MONTH) + 1,expires.get(Calendar.HOUR_OF_DAY),expires.get(Calendar.MINUTE),expires.get(Calendar.SECOND));
      throw new AuthenticationException("String_Node_Str" + timestamp + "String_Node_Str"+ exp+ "String_Node_Str"+ expiryTime);
    }
  }
}