Do you meet such situation,convert between utf8 and unicode,dump the constant pool of java class file,a simple server instead of use tomcat as a midlet download server for test purpose;so this is the utility-tool's responsibility;
Open Source IM and voice client using Jabber and SIP protocols, with great audio quality thanks to speex and a nice and clean interface. Programmed in Java and C++. It supports chat, voice and file transfers.