Checkstyle, PMD, and FindBugs Plugin: No Tasks

When I apply the plugins for Checkstyle, PMD, and FindBugs it doesn’t create the tasks (checkstyleMain, pmdMain, findbugsMain, and company). I’m currently on Gradle 4.1 RC2 and if it matters at all, Android plugin 3 alpha 9.

My current build.gradle file is as follows:

apply plugin: 'com.android.application'
apply plugin: 'pmd'
apply plugin: 'checkstyle'
apply plugin: 'findbugs'

repositories {
    mavenCentral()
    google() // Gradle 4.0 adds this
}

android {
    compileSdkVersion 26
    buildToolsVersion '26.0.1'
    defaultConfig {
        applicationId "com.gelakinetic.mtgfam"
        minSdkVersion 15
        targetSdkVersion 26
        versionCode 49
        versionName "3.4.2"
        vectorDrawables.useSupportLibrary = true
    }
    packagingOptions {
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/NOTICE.txt'
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'),
                    'proguard-rules.txt'
            findbugs
        }
    }
    flavorDimensions "license"
    productFlavors {
        standard {
            dependencies {
                compile 'com.google.firebase:firebase-appindexing:11.0.2'
            }
            dimension "license"
        }
        foss {
            versionName "3.4.2-foss"
            dimension "license"
        }
    }
}

dependencies {
    compile 'org.apache.commons:commons-lang3:3.6'
    compile 'org.apache.commons:commons-io:1.3.2'
    compile 'org.apache.commons:commons-collections4:4.1'
    compile 'cz.msebera.android:httpclient:4.4.1.2'
    compile 'com.octo.android.robospice:robospice:1.4.14'
    compile 'com.octo.android.robospice:robospice-cache:1.4.14'
    compile 'com.android.support:support-v4:26.0.0'
    compile 'com.android.support:support-v13:26.0.0'
    compile 'com.android.support:appcompat-v7:26.0.0'
    compile 'com.android.support:cardview-v7:26.0.0'
    compile 'com.android.support:design:26.0.0'
    compile 'com.android.support:gridlayout-v7:26.0.0'
    compile 'com.android.support:recyclerview-v7:26.0.0'
    compile 'com.github.woxthebox:draglistview:1.4.7'
    compile 'org.jetbrains:annotations:13.0'
    compile 'com.google.code.gson:gson:2.8.1'
    compile 'com.afollestad.material-dialogs:core:0.9.4.5'
    compile 'com.jpardogo.materialtabstrip:library:1.1.1'
    compile 'com.code-troopers.betterpickers:library:3.1.0'
    compile 'com.github.machinarius:preferencefragment:0.1.2'
    compile 'org.jsoup:jsoup:1.10.3'
    compile "com.splitwise:tokenautocomplete:2.0.8"
}