Pros & Cons of Vector/ArrayList in clusters

[Chengwei Lee]

Hi all,

In a clustered environment (WLS 8.x), since Vector, ArrayList, Hashtable & HashMap are all serializable, are there any advantages/disadvantages of using Vector over ArrayList and Hashtable over HashMap?

I read from the WLS doc that for replication to occur, objects in the session must be serializable, so all these 4 objects fit the bill (as long as the objects that they contain are serializable too).

If I'm merely using the objects contained in Vector & Hashtable for read-only, display purposes, would it be safe for me to switch to use ArrayList & HashMap to get rid of the synchronization overheads?

Thanks!

[Roger Chung-Wee]

Always use ArrayList and HashMap unless you are dealing with legacy code which requires the use of Vector and Hashtable.

[Chengwei Lee]

Yes Roger. I know the advantages of ArrayList and HashMap over Vector and Hashtable in a single JVM environment. I'm just not sure whether it is the same in clusters?