code: function(exceptionName)
      {
          var app = this;
          var exception = {};
          try
          {
              if(app.exceptions.hasOwnProperty(exceptionName)){
                  exception = app.exceptions[exceptionName];
              }else{                
                  throw "not found";
              }
          }
          catch(e)
          {
              var objFilePath = path.join(app._path,"exceptions",exceptionName);
              if(fs.existsSync(objFilePath+".js"))
              {
                  var exceptionConfig = require(objFilePath);
                  if(typeof app.exceptions != "object") app.exceptions={};
                  app.exceptions[exceptionName]= exceptionConfig;                    
                  exception = exceptionConfig;
              }
          }
          return exception;
      }
docs: Get specified openbiz pre-defined system exception.
  
  This method it part of {@link openbiz.objects.Application},
  please never call this directly by ObjectService.
  
  if need to call this method, you have to use javascript's function.apply(applicationPointer,params)
  please see sample
  @memberof openbiz.services.ObjectService
  @param {string} exceptionName
  @returns object Exception object
  
  @example
  var Exception = app.openbiz.apps.xxxx.getExecption("Exception");
  
  throw new Exception(exceptionCode, error);