Workaround for calling the service report null pointer in Spring MVC General class or tool class (call service Java.lang.NullPointerException)

When we apply a service to a non-controller class, we report a null pointer,

This is because of a workaround for calling the service report NULL NULL in the spring MVC generic class or tool class (call service Java.lang.NullPointerException)

By following the steps above to resolve your own tool class, you will find that the project is running and still reporting a null pointer at this point you need to add a line of configuration files to the Applicationcontext.xml configuration file

Annotate the package that contains your own tool class so that spring can recognize the annotations that you have configured above

Workaround for calling the service report null pointer in Spring MVC General class or tool class (call service Java.lang.NullPointerException)