use of ArrayList in Java classes, EJB classes

[Avianu Sud]

From a thread safety perspective, what kind of issues can we encounter using java.util.ArrayList class instances in Servlet classes, and EJB classes? It will be great to describe this with an example, where an error can occur

It is recommended as very safe, and widely used, so when should it be not used in a Web environment?

Thanks in advance,
Avi.

[Mr. C Lamont Gilbert]

All of your references will need special attention in multithreaded environment. Nothing special about collections except they corrupt more noticeably. You hope...