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Editorial Team
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Asked: 2026-05-18T12:16:58+00:00

I’m trying to get my java build to fail when I have a class

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I’m trying to get my java build to fail when I have a class that overrides a superclass method without specifying the @Override annotation.

The build is being done via ant, and I’ve added the following elements to my <javac> task:

<compilerarg value="-Werror"/>
<compilerarg value="-Xlint:unchecked,overrides"/>

The unchecked option is being followed, but the overrides option is being ignored. I also tried separating the two Xlint options into two separate <compilerarg> elements, to no avail. Am I misunderstanding what this option does?

One note: this is JDK6 on MacOSX (10.6). Could I be running into a OSX-specific bug?

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  1. Editorial Team

    I believe you are misunderstanding the Xlint:overrides behaviour.

    To my knowledge, enabling this check will cause the compiler to emit warnings (or maybe errors) when it encounters a method annotated with @Override that does not actually override a superclass method. It does not, however, check that all overridden methods are annotated correctly.

    EDIT: Just tested it. The compiler will emit an error when you specify @Override on a method that does not override a superclass method, with or without the Xlint option.

    The documentation on Oracle’s website doesn’t even mention the Xlint:overrides option so I’m guessing it’s not implemented.

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