You may submit your bugs and feature suggestions for Java using the following web site: Submitting a Bug or Feature Request

You can also fix bugs yourself in the latest JDK and submit your bugfixes to Sun Microsystems. But you need to search for this in java.net since the project name for the latest jdk is going to change by time.

As a reference, you may look at the Mustang (Java SE 6) project from here.

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