Program: 82906
Project: 82906
Buggy source:
@Override protected void service(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
  TreeLogger logger=getLogger();
  int id=allocateRequestId();
  if (logger.isLoggable(TreeLogger.TRACE)) {
    StringBuffer url=request.getRequestURL();
    logger=logger.branch(TreeLogger.TRACE,"String_Node_Str" + id + "String_Node_Str"+ url,null);
  }
  String servletClassName=null;
  ModuleDef moduleDef=null;
  try {
    RequestParts parts=new RequestParts(request);
    moduleDef=loadedModulesByName.get(parts.moduleName);
    if (moduleDef != null) {
      String servletPath="String_Node_Str" + parts.partialPath;
      servletClassName=moduleDef.findServletForPath(servletPath);
    }
 else {
    }
  }
 catch (  UnableToCompleteException e) {
  }
  if (servletClassName == null) {
    String path=request.getPathInfo();
    moduleDef=modulesByServletPath.get(path);
    if (moduleDef != null) {
      servletClassName=moduleDef.findServletForPath(path);
      if (servletClassName != null) {
        TreeLogger branch=logger.branch(TreeLogger.WARN,"String_Node_Str",null);
        branch.log(TreeLogger.WARN,"String_Node_Str" + path,null);
        branch.log(TreeLogger.WARN,"String_Node_Str" + moduleDef.getName() + path,null);
        branch.log(TreeLogger.WARN,"String_Node_Str",null);
      }
    }
 else {
    }
  }
  if (servletClassName != null) {
    HttpServlet delegatee=tryGetOrLoadServlet(logger,moduleDef,servletClassName);
    if (delegatee == null) {
      logger.log(TreeLogger.ERROR,"String_Node_Str",null);
      sendErrorResponse(response,HttpServletResponse.SC_INTERNAL_SERVER_ERROR,"String_Node_Str" + servletClassName + "String_Node_Str");
      return;
    }
    delegatee.service(request,response);
  }
 else {
    super.service(request,response);
  }
}

Fixed version (ground truth):
@Override protected void service(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
  TreeLogger logger=getLogger();
  int id=allocateRequestId();
  if (logger.isLoggable(TreeLogger.TRACE)) {
    StringBuffer url=request.getRequestURL();
    logger=logger.branch(TreeLogger.TRACE,"String_Node_Str" + id + "String_Node_Str"+ url,null);
  }
  String servletClassName=null;
  ModuleDef moduleDef=null;
  try {
    RequestParts parts=new RequestParts(request);
    moduleDef=getModuleDef(logger,parts.moduleName);
    if (moduleDef != null) {
      String servletPath="String_Node_Str" + parts.partialPath;
      servletClassName=moduleDef.findServletForPath(servletPath);
    }
 else {
    }
  }
 catch (  UnableToCompleteException e) {
  }
  if (servletClassName == null) {
    String path=request.getPathInfo();
    moduleDef=modulesByServletPath.get(path);
    if (moduleDef != null) {
      servletClassName=moduleDef.findServletForPath(path);
      if (servletClassName != null) {
        TreeLogger branch=logger.branch(TreeLogger.WARN,"String_Node_Str",null);
        branch.log(TreeLogger.WARN,"String_Node_Str" + path,null);
        branch.log(TreeLogger.WARN,"String_Node_Str" + moduleDef.getName() + path,null);
        branch.log(TreeLogger.WARN,"String_Node_Str",null);
      }
    }
 else {
    }
  }
  if (servletClassName != null) {
    HttpServlet delegatee=tryGetOrLoadServlet(logger,moduleDef,servletClassName);
    if (delegatee == null) {
      logger.log(TreeLogger.ERROR,"String_Node_Str",null);
      sendErrorResponse(response,HttpServletResponse.SC_INTERNAL_SERVER_ERROR,"String_Node_Str" + servletClassName + "String_Node_Str");
      return;
    }
    delegatee.service(request,response);
  }
 else {
    super.service(request,response);
  }
}