Java EE application Development general Debugging Summary

In the debug category I share my previous debugging summary, after a few months, after this period of reflection, I summed up the Java EE Application development of a general idea, for reference only, welcome to share the discussion.

At present, most applications are browser/server mode, then development is divided into two parts, that is, the public said the foreground (assuming the use of rich client framework development (EXTJS, easyui===) and backstage, for an application, Server is the content core (Web application is the core of the content provider), so the program run abnormal situation, then the first check is the background is not correct to query the required data, in the foreground there is no return and background query data, this time debugging focus fell on the front desk, The assumption is that the foreground control (common DataGrid, tree) parsing data, then the general situation may be the data structure problems, data structure is the interface of program interaction, if you are familiar with the data structure of the control, the first step is to check the structure of the returned data, if the data structure is not a problem Then the problem may appear on the data, generally, the background data returned by the HTML elements, it is very likely to disrupt the original control's DOM structure and CSS rendering effect. There are also situations where the control is otherwise handled by itself. If you do not know the format of the control data, there can be a most common way, that is, the comparison of the wrong method, this method million test million, that is, the normal operation of the operation with the abnormal performance of the comparison, here need to be careful and patient. Reducing replication stickiness reduces the number of bugs that are more hidden in specific code in a particular environment.

Although it sounds very simple, but I found that many times when I am in the debugging will not follow this thinking to debug, a lot of time is a random guess, is not this. Is that. Crashing around like a headless fly. On the philosophy above, theory guides practice, Practice perfect theory, I believe that even the rough theory is better than the practice of guessing.