I think OP is asking about a mobil phone java software .
It also a software , then you know where are they ! may be ppl here guide you what to download , but they can't say you where to download ! This is not a file sharing site . go somewhere else you will find the answer .
If you asking how to download and install java software for a mobil phone ?just download the jad or jar file . If you download via the GPRS , first download or get the jad file and jad will automatically see if your phone supports this or not , and after that it download the JAR file .
or via a desktop computer download the jar files and deploy it on the phone .