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If standard javac warnings are enabled and a class implements Serialializable and Comparable (for example), The hint shown is the warning about no definition of serialVersionUID, even though there is an error on the same line ("does not override abstract method compareTo"). The more severe hint (the error) should be displayed, rather than the warning.
Yes, this should be fixed. Already reported, but thanks anyway. *** This issue has been marked as a duplicate of 105808 ***