srcmain
    groovy
        com.lapots.breed.judge.rulebook
    java
        com.lapots.breed.judge

com.lapots.breed.judge.rulebook.domain.execution.binding.BindingType.setMnemonic(Object) unconditionally sets the field mnemonic

<?xml version="1.0" encoding="UTF-8"?>
<FindBugsFilter>
    <Match>
        <Package name="com.lapots.breed.judge.rulebook"/>
    </Match>
</FindBugsFilter>

tasks.withType(FindBugs) {
    reports {
        xml.enabled = false
        html.enabled = true
    }
}

findbugs {
    sourceSets = [sourceSets.main]
    excludeFilter = file('excludeFilter.xml')
}