Describe how to implement singleton design pattern in struts

Describe how to implement singleton design pattern in struts.

- A singleton design pattern implementation is done using action class in struts framework.

- It performs as a front controller and every request goes through it.

- Also, the logging mechanism is easier.

- This can be achieved without authoring Log4j class over and over in each and every servlet.

- The singleton pattern restricts the instantiation of a class and ensures that only one instance of a class exists the java virtual machine.

- It provides global access point to the instance of the class.

- It is used for logging, driver objects, caching and thread pool.
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