It was too cumbersome to use the NB module as it belongs to the IDE cluster and doesn't have public packages. I went with the official Maven dependency instead

<dependency>
    <groupId>com.mastfrog</groupId>
    <artifactId>simplevalidation-swing</artifactId>
    <version>1.14.1</version>
    <exclusions>
        <exclusion>
            <groupId>com.mastfrog</groupId>
            <artifactId>nbstubs</artifactId>
        </exclusion>
    </exclusions>
</dependency>

The library is part of the UILibraryWrapper module and exposes the API via public packages. I also wrote a small wrapper DialogDescriptorWithValidation to make it easy to work with DialogDescriptor that contains ValidationPanel as inner panel.