diff --git a/README.md b/README.md
index 354ff9a0..b5d9c002 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ Also, for Android projects the license HTML file will be copied to `<project>/sr
 buildscript {
   repositories {
     mavenCentral()
-    google()
+    google() // For Android projects
   }
 
   dependencies {
@@ -37,7 +37,7 @@ Release versions are available in the [Sonatype's release repository](https://re
 buildscript {
   repositories {
     maven { url 'https://oss.sonatype.org/content/repositories/snapshots' }
-    google()
+    google() // For Android projects
   }
 
   dependencies {
diff --git a/build.gradle b/build.gradle
index 087f9c66..b638bb93 100644
--- a/build.gradle
+++ b/build.gradle
@@ -47,20 +47,23 @@ task createClasspathManifest() {
     outputDir.mkdirs()
     // Combine both main and test plugin classpaths
     file("$outputDir/plugin-classpath.txt").text = sourceSets.main.runtimeClasspath.join('\n') +
-      '\n' +
-      sourceSets.test.runtimeClasspath.join('\n')
+      '\n' + sourceSets.test.runtimeClasspath.join('\n')
   }
 }
 
 dependencies {
+  compileOnly gradleApi()
+  compileOnly deps.android.tools.build.gradle
+
   implementation deps.kotlin.stdlib.jdk
   implementation deps.kotlinx.html
   implementation deps.gson
-  implementation deps.android.tools.build.gradle
 
   testRuntimeOnly files(createClasspathManifest)
+  testRuntimeOnly deps.android.tools.build.gradle
 
   testImplementation localGroovy()
+  testImplementation gradleTestKit()
   testImplementation deps.spock, { exclude module: 'groovy-all' } // Use localGroovy()
   testImplementation deps.xmlunit.matchers
   testImplementation deps.commons.csv
diff --git a/src/main/kotlin/com/jaredsburrows/license/LicensePlugin.kt b/src/main/kotlin/com/jaredsburrows/license/LicensePlugin.kt
index 16aa5e1d..2754ebb3 100644
--- a/src/main/kotlin/com/jaredsburrows/license/LicensePlugin.kt
+++ b/src/main/kotlin/com/jaredsburrows/license/LicensePlugin.kt
@@ -1,73 +1,19 @@
 package com.jaredsburrows.license
 
-import com.android.build.gradle.AppExtension
-import com.android.build.gradle.AppPlugin
-import com.android.build.gradle.BaseExtension
-import com.android.build.gradle.FeatureExtension
-import com.android.build.gradle.FeaturePlugin
-import com.android.build.gradle.LibraryExtension
-import com.android.build.gradle.LibraryPlugin
-import com.android.build.gradle.api.BaseVariant
-import org.gradle.api.DomainObjectSet
 import org.gradle.api.Plugin
 import org.gradle.api.Project
-import org.gradle.api.plugins.JavaPlugin
-import java.util.Locale
 
 /** A [Plugin] which grabs the POM.xml files from maven dependencies. */
 class LicensePlugin : Plugin<Project> {
   override fun apply(project: Project) {
     project.extensions.add("licenseReport", LicenseReportExtension::class.java)
 
-    project.plugins.all {
-      when (it) {
-        is JavaPlugin -> project.configureJavaProject()
-        is FeaturePlugin -> {
-          project.extensions.getByType(FeatureExtension::class.java).run {
-            project.configureAndroidProject(featureVariants)
-            project.configureAndroidProject(libraryVariants)
-          }
-        }
-        is LibraryPlugin -> {
-          project.extensions.getByType(LibraryExtension::class.java).run {
-            project.configureAndroidProject(libraryVariants)
-          }
-        }
-        is AppPlugin -> {
-          project.extensions.getByType(AppExtension::class.java).run {
-            project.configureAndroidProject(applicationVariants)
-          }
-        }
+    project.afterEvaluate {
+      when {
+        project.isAndroidProject() -> project.configureAndroidProject()
+        project.isJavaProject() -> project.configureJavaProject()
+        else -> throw UnsupportedOperationException("'com.jaredsburrows.license' requires Java or Android Gradle Plugins.")
       }
     }
   }
 }
-
-/** Configure for Java projects. */
-private fun Project.configureJavaProject() {
-  tasks.register("licenseReport", LicenseReportTask::class.java)
-}
-
-/** Configure for Android projects. */
-private fun Project.configureAndroidProject(variants: DomainObjectSet<out BaseVariant>? = null) {
-  // Configure tasks for all variants
-  variants?.all { variant ->
-    val name = variant.name.replaceFirstChar {
-      if (it.isLowerCase()) {
-        it.titlecase(Locale.getDefault())
-      } else {
-        it.toString()
-      }
-    }
-
-    tasks.register("license${name}Report", LicenseReportTask::class.java) {
-      it.assetDirs = (extensions.getByName("android") as BaseExtension)
-        .sourceSets
-        .getByName("main")
-        .assets
-        .srcDirs
-        .toList()
-      it.variantName = variant.name
-    }
-  }
-}
diff --git a/src/main/kotlin/com/jaredsburrows/license/projectAndroid.kt b/src/main/kotlin/com/jaredsburrows/license/projectAndroid.kt
new file mode 100644
index 00000000..2b83e756
--- /dev/null
+++ b/src/main/kotlin/com/jaredsburrows/license/projectAndroid.kt
@@ -0,0 +1,71 @@
+package com.jaredsburrows.license
+
+import com.android.build.gradle.AppExtension
+import com.android.build.gradle.AppPlugin
+import com.android.build.gradle.BaseExtension
+import com.android.build.gradle.FeatureExtension
+import com.android.build.gradle.FeaturePlugin
+import com.android.build.gradle.LibraryExtension
+import com.android.build.gradle.LibraryPlugin
+import com.android.build.gradle.api.BaseVariant
+import org.gradle.api.DomainObjectSet
+import org.gradle.api.Project
+import java.util.Locale
+
+/** Returns true if Android Gradle project */
+internal fun Project.isAndroidProject(): Boolean {
+  return project.plugins.hasPlugin("android")
+}
+
+/**
+ * Configure for Android projects.
+ *
+ * AppPlugin - "android", "com.android.application"
+ * FeaturePlugin - "com.android.feature"
+ * LibraryPlugin - "android-library", "com.android.library"
+ */
+internal fun Project.configureAndroidProject() {
+  project.plugins.all {
+    when (it) {
+      is AppPlugin -> {
+        project.extensions.getByType(AppExtension::class.java).run {
+          configureVariant(applicationVariants)
+        }
+      }
+      is FeaturePlugin -> {
+        project.extensions.getByType(FeatureExtension::class.java).run {
+          configureVariant(featureVariants)
+          configureVariant(libraryVariants)
+        }
+      }
+      is LibraryPlugin -> {
+        project.extensions.getByType(LibraryExtension::class.java).run {
+          configureVariant(libraryVariants)
+        }
+      }
+    }
+  }
+}
+
+private fun Project.configureVariant(variants: DomainObjectSet<out BaseVariant>? = null) {
+  // Configure tasks for all variants
+  variants?.all { variant ->
+    val name = variant.name.replaceFirstChar {
+      if (it.isLowerCase()) {
+        it.titlecase(Locale.getDefault())
+      } else {
+        it.toString()
+      }
+    }
+
+    tasks.register("license${name}Report", LicenseReportTask::class.java) {
+      it.assetDirs = (extensions.getByName("android") as BaseExtension)
+        .sourceSets
+        .getByName("main")
+        .assets
+        .srcDirs
+        .toList()
+      it.variantName = variant.name
+    }
+  }
+}
diff --git a/src/main/kotlin/com/jaredsburrows/license/projectJava.kt b/src/main/kotlin/com/jaredsburrows/license/projectJava.kt
new file mode 100644
index 00000000..10f0d7a7
--- /dev/null
+++ b/src/main/kotlin/com/jaredsburrows/license/projectJava.kt
@@ -0,0 +1,18 @@
+package com.jaredsburrows.license
+
+import org.gradle.api.Project
+
+/** Returns true if Java Gradle project */
+internal fun Project.isJavaProject(): Boolean {
+  return project.plugins.hasPlugin("java")
+}
+
+/**
+ * Configure for Java projects.
+ *
+ * JavaPlugin - "java" - also applies JavaBasePlugin
+ * JavaLibraryPlugin - "java-library" - also applies JavaPlugin
+ */
+internal fun Project.configureJavaProject() {
+  tasks.register("licenseReport", LicenseReportTask::class.java)
+}