Hi. This is a standard java thing: check your classpath. Ter On Feb 3, 2006, at 2:34 PM, 孙纪刚 Jigang (Robert) Sun wrote: > It is the same: changed from antlr.tool to antlr.Tool, it responded : > > Exception in thread "main" java.lang.NoClassDefFonudError:antlr/Tool > > > Jigang > > > 雅虎1G免费邮箱百分百防垃圾信 > 雅虎助手-搜索、杀毒、防骚扰