In strtus1.2 action class is not thread safe we have to handle it because only one instance action class serve all the requests where it was modified in struts2. For each request new object will be created no need to bother about thread safe.
ocjp 6 — Feeding a person with food is a great thing in this world. Feeding the same person by transferring the knowledge is far more better thing. The reason is the amount of satisfaction which we get through food is of only one minute or two. But the satisfaction which we can get through the knowledge is of life long.