This extra package seems to be dead since 2002. I was not even aware this exists as separate project. If you want to embed the JEditTextArea, you should use the recent version. For this you would have to take the source distribution and call "ant build-textArea" which should produce the independent TextArea to be embedded in other projects.

如果您正在使用Swing，那么也许StyledDocument适合您？我在应用程序中使用它进行语法高亮，这相对容易。