Recently a user named jirkahana post a topic on the java.net JDK forum about the fact that javax.xml.stream.XMLReader inherits from a non generified Iterator.
I've kickly sumbitted a bug report (6472193 and as i'm a jdk contributor, i've provided a patch that correct the bug.

Now, we are late in the sceduling of mustang, and only showstoppers bug can be corrected. So here is my question, is this bug is a showstopper ?

When tiger introduces generics, some APIs likes java.util, java.lang was retrofited to use them. We are now in a post-tiger world, it seems normal to think that all APIs of mustang use generics but that is not the case, at least the package javax.xml.stream was not apparently generified when included in the source tree of the JDK.

You could answer that is not a big beal, we can generifed it later like we already did with existing APIs.
Yes, we can retrofit the whole package but one class will cause a backward compatibility issue. And guess what, its javax.xml.stream.XMLReader.

XMLReader is an interface that extends Iterator, so each implementation need to provide a code for the method next that returns an Object. Now suppose that someone decides to correct the bug after the official release of mustang. XMLReader will be changed to extend from Iterator<XMLExvent> thus the method next will need to return a XMLEvent and not an Object. It will break all implementations of XMLReader. In short, this bug is not fixable after the release of mustang.

So i ask the question, is bug 6472193 a showstopper ?