Remember the pits encountered in the secondary development of ngrinder (1)

According to the blog of a great god on the Internet, a simple secondary development of ngrinder is to add some percentile lines and the like. The blog address:

https://blog.csdn.net/neven7/article/details/50740018

After the completion, in the process of using the actual project, it often happens that the test cannot be performed. The blue dots keep flashing and can't be stopped. The controller must be restarted. By checking the log, it is found that the problem occurs in getPlusResult( ) method here, throw this method with try-catch, and this problem will not appear again