There are a number of implementations of JSR 305 (https://jcp.org/en/jsr/detail?id=305 https://jcp.org/en/jsr/detail?id=305). Findbugs is one that provides the

There are a number of implementations of JSR 305 (https://jcp.org/en/jsr/detail?id=305 https://jcp.org/en/jsr/detail?id=305). Findbugs is one that provides the annotations. You can include the annotations JAR file on your compile path and then use findbugs in your build to enforce them. IntelliJ will still recognize them and flag the warnings/errors.