Struts 2 Study Notes-talking about struts thread security

Sruts 2 workflow:

All actions in struts 1 have only one instance, which is used repeatedly. Through the red font section of the workflow of struts 2 above, we can clearly see that each action in struts 2 has multiple instances, meaning that an action instance is generated every time a request is processed, these instances are independent of each other and will be destroyed after processing. Therefore, the action in struts 1 is thread unsafe, and the action in struts 2 is thread safe. Because there are no other special resources in the action, it will be destroyed after use, without wasting resources.