可执行的hellojxta源码,修改了错误，使用jxta2.5 jar包-an excutable hellojxta.java resource code modified for jxta2.5

一个实际的p2p_jxta应该例子,可实现对话，搜索，文件共享等功能。-MyJXTA is a prototypical IM application based upon JXTA. It supports group chat, secure one-to-one chat, file sharing。