The error message of null pointer exception is cjaction.java, and the class name is probably the result of Action 165 lines of code. What variable or other value is not obtained, resulting in null pointer exception.

After reading your 1, 2, 3, 4, I said a lot. In fact, if it is convenient, I suggest remote debugging in the actual environment on your computer. Your problem is that you can't get the value. It may be that the value passed by one of the steps is incorrect, resulting in an abnormal null pointer.