Brian is correct, you cannot replace JBC 1.4.x with 3.x in JBoss AS 4.x.
I thought you wanted to migrate from 1.4.x to 3.x in one of your custom apps and hence my
comment earlier.
If you have a webapp or an ear that directly interfaces with JBC and you want to use the
new features in 3.x and still deploy in JBoss AS 4.2, have a look at this link.
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