Program: 31376
Project: 31376
Buggy source:
public Action check(HttpServletRequest request,InterceptingHTTPServletResponse response,HttpServletResponse httpResponse){
  if (path != null && !path.matcher(request.getRequestURL().toString()).matches()) {
    return new DoNothingAction();
  }
  if (contentType != null) {
    if (response.getContentType() != null && !contentType.matcher(response.getContentType()).matches()) {
      return new DoNothingAction();
    }
  }
  byte[] bytes=null;
  try {
    bytes=response.getInterceptingServletOutputStream().getResponseBytes();
  }
 catch (  IOException ioe) {
    log(request,"String_Node_Str" + pattern.pattern() + "String_Node_Str"+ ioe.getMessage()+ "String_Node_Str"+ request.getRequestURL()+ "String_Node_Str");
    return new DoNothingAction();
  }
  try {
    String s=new String(bytes,response.getCharacterEncoding());
    Matcher m=pattern.matcher(s);
    String canary=m.replaceAll(replacement);
    try {
      if (!s.equals(canary)) {
        response.getInterceptingServletOutputStream().setResponseBytes(canary.getBytes(response.getCharacterEncoding()));
        logger.log(AppGuardianConfiguration.LOG_LEVEL,"String_Node_Str" + pattern.pattern() + "String_Node_Str"+ request.getRequestURL()+ "String_Node_Str");
      }
    }
 catch (    IOException ioe) {
      logger.log(AppGuardianConfiguration.LOG_LEVEL,"String_Node_Str" + pattern.pattern() + "String_Node_Str"+ request.getRequestURL()+ "String_Node_Str"+ ioe.getMessage()+ "String_Node_Str");
    }
  }
 catch (  UnsupportedEncodingException uee) {
    logger.log(AppGuardianConfiguration.LOG_LEVEL,"String_Node_Str" + pattern.pattern() + "String_Node_Str"+ request.getRequestURL()+ "String_Node_Str"+ uee.getMessage()+ "String_Node_Str");
  }
  return new DoNothingAction();
}

Fixed version (ground truth):
public Action check(HttpServletRequest request,InterceptingHTTPServletResponse response,HttpServletResponse httpResponse){
  String uri=request.getRequestURI();
  if (path != null && !path.matcher(uri).matches()) {
    return new DoNothingAction();
  }
  if (contentType != null) {
    if (response.getContentType() != null && !contentType.matcher(response.getContentType()).matches()) {
      return new DoNothingAction();
    }
  }
  byte[] bytes=null;
  try {
    bytes=response.getInterceptingServletOutputStream().getResponseBytes();
  }
 catch (  IOException ioe) {
    log(request,"String_Node_Str" + pattern.pattern() + "String_Node_Str"+ ioe.getMessage()+ "String_Node_Str"+ request.getRequestURL()+ "String_Node_Str");
    return new DoNothingAction();
  }
  try {
    String s=new String(bytes,response.getCharacterEncoding());
    Matcher m=pattern.matcher(s);
    String canary=m.replaceAll(replacement);
    try {
      if (!s.equals(canary)) {
        response.getInterceptingServletOutputStream().setResponseBytes(canary.getBytes(response.getCharacterEncoding()));
        logger.log(AppGuardianConfiguration.LOG_LEVEL,"String_Node_Str" + pattern.pattern() + "String_Node_Str"+ request.getRequestURL()+ "String_Node_Str");
      }
    }
 catch (    IOException ioe) {
      logger.log(AppGuardianConfiguration.LOG_LEVEL,"String_Node_Str" + pattern.pattern() + "String_Node_Str"+ request.getRequestURL()+ "String_Node_Str"+ ioe.getMessage()+ "String_Node_Str");
    }
  }
 catch (  UnsupportedEncodingException uee) {
    logger.log(AppGuardianConfiguration.LOG_LEVEL,"String_Node_Str" + pattern.pattern() + "String_Node_Str"+ request.getRequestURL()+ "String_Node_Str"+ uee.getMessage()+ "String_Node_Str");
  }
  return new DoNothingAction();
}