can RMI compiled with Java 1.5 be run by 1.4?

I got "version 49.0" exception,is it possible to be run by client of Java of not the same version of the compilor ?Thanks~~
[144 byte] By [rubyyana] at [2007-10-2 4:48:59]
# 1
http://java.sun.com/j2se/1.5.0/docs/tooldocs/windows/javac.htmlCheck out the -target option
carr_onstotta at 2007-7-16 0:53:38 > top of Java-index,Core,Core APIs...