Problem of injecting spring objects into Java multi-threading

It is easy to throw nullpointerexception when Java multithreading in the Web application is processing the business.

Reason:

The spring bean in the thread was not injected. When the Web container starts, it does not inject the beans in the thread in advance, and the Web container is not perceptible until the threads are started.

Solution:

Method one, when declaring a member variable, defines it as static. (said not to be OK)

Method Two, set the thread as the inner class of the program.

The bean is injected into the outer class so that the object can be "shared" within the internal class thread.

Method Three, define a tool class, use the static factory method to obtain the Bean object through Getbean.

　

Problem of injecting spring objects into Java multi-threading