No information about syntax errors in wiki component code

I wrote an event listener like this
http://extensions.xwiki.org/xwiki/bin/view/Extension/WikiComponent+Module#HWritecomponentsindocuments

In the onEvent method, in the groovy, there were some syntax errors. There is no way to find out about these errors, there is no log in the server logs about this, and no information in the pages either (for example when saving the wiki component).

This issue is making it very hard to use this functionality, as it is extremely time wasting to write the actual code of the wiki component: if there is a syntax error we don't even know where it is.