Installing Java 1.4.2 after Java 1.5.

I have a new computer in which I installed Java 1.5 and J2EE 1.4. I have since learned that the latest Sun Application Server (strangely) does not support J2SE 1.5. Is it safe to install Java 1.4.2 after JAva 1,5, or should I delete Java 1.5 first?
[255 byte] By [pford68a] at [2007-10-1 6:59:39]
# 1
If it were me, I'd remove all of them and start over. I say that because I don't know whether J2EE can accomodate the change from J2SE 1.5 to 1.4 without problem.
ChuckBinga at 2007-7-9 17:31:49 > top of Java-index,Administration Tools,Sun Connection...