Is it possible to be informed when clipboard content changes outside of java

The thing I would want to do is that when the user copies a text in any program (firefox, notepad, pdfReader etc.) my already running java application shall be informed and immediately shows a popup.

I think in order to be able to do this my java application should be invoked whenever system clipboard is changes.

Is that possible with java, if so in which version? I know we can reach and manipulate system clipboard content but my specific question is about invoking the java app. when clipboard content changes.

Thanks