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I found several bundles containing multiple values for the same key. It should be checked at UI interface as well as at API interface. At API level a contains() method and checked exception can be enough: public class KeyException extends Exception { String getKey(); /** Get exiting value. */ String getOldValue(); /** Get conflicting value. */ String getNewValue(); } Another approach (supposing that adding duplicite key is a programming error) is to extend runtime IllegalStateException instead of Exception. In text editor interface a key can be annotated once user type '=' producing duplicite key.
Accepted.
Obsolete target milestone. Change from 6.x to TBD