There is one simple method for suppressing the FindBugs warnings - usage of edu.umd.cs.findbugs.annotations.SuppressWarnings annotation. Just add it in the place where FindBugs reported problem, and use the appropriate bug code.
You should start by adding com.google.code.findbugs:annotations:2.0.0 jar to the project dependencies. Then open the bug reported by FindBugs, and find its code, like in this example:
Nice! Isn't it? - No, it isn't :( - Why you may ask? - Because there is another annotation in java.lang package with exactly the same name (!), used for suppressing different kind of warnings. Shouldn't it be used instead? - Well ...
Another question is if we want to add another jar to the project dependencies just for suppressing FindBugs warnings - thank God the FindBugs authors marked this annotation with retention policy 'CLASS', which means the jar will not be required when running the project (ex. in web application container).