Add Spotless Java linter

build.gradle

@@ -21,6 +21,7 @@ plugins {
 	id 'java'
 	id 'eclipse'
 	id 'idea'
+	id "com.diffplug.spotless" version "5.14.3"
 	id 'com.matthewprenger.cursegradle' version '1.4.0'
 	id 'se.bjurr.gitchangelog.git-changelog-gradle-plugin' version '1.71.4'
 }
@@ -70,9 +71,9 @@ repositories {
 
 dependencies {
 	minecraft([
-			group  : "${project.forgegroup}",
+			group  : "${project.forge_group}",
 			name   : 'forge',
-			version: "${project.mcversion}-${project.forgeversion}"
+			version: "${project.minecraft_version}-${project.forge_version}"
 	])
 	testImplementation "org.junit.jupiter:junit-jupiter-api:5.7.2"
 	testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:5.7.2"
@@ -81,7 +82,7 @@ dependencies {
 }
 
 minecraft {
-	mappings channel: 'official', version: project.mcversion
+	mappings channel: 'official', version: project.minecraft_version
 
 	accessTransformer = file('src/main/resources/META-INF/accesstransformer.cfg')
 
@@ -144,7 +145,7 @@ curseforge {
 		changelog = file('changelog.html')
 		changelogType = 'html'
 		releaseType = 'beta'
-		addGameVersion "${mcversion}"
+		addGameVersion "${minecraft_version}"
 	}
 }
 
@@ -251,3 +252,13 @@ test {
 	include 'mezz/jei/**'
 	exclude 'mezz/jei/lib/**'
 }
+
+spotless {
+	java {
+		target 'src/*/java/mezz/jei/**/*.java'
+
+		endWithNewline()
+		trimTrailingWhitespace()
+		removeUnusedImports()
+	}
+}

gradle.properties

@@ -1,15 +1,30 @@
-org.gradle.jvmargs=-Xmx3G
 org.gradle.daemon=false
 
-mcversion=1.17.1
-forgeversion=37.0.32
+# Minecraft
+minecraft_version=1.17.1
+minecraft_version_range=[1.17.1, 1.18)
+
+# Forge
+forge_version=37.0.32
 loader_version_range=[37,)
 forge_version_range=[37.0.31,)
-minecraft_version_range=[1.17.1, 1.18)
-forgegroup=net.minecraftforge
-curse_project_id=238222
+forge_group=net.minecraftforge
+
+# Dependencies
 ftb_library_version=1605.3.0-build.64
 
+# Publishing
+curse_project_id=238222
+
+# Version
 version_major=8
 version_minor=0
 version_patch=0
+
+# Workaround for Spotless bug
+# https://github.com/diffplug/spotless/issues/834
+org.gradle.jvmargs=--add-exports jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED \
+  --add-exports jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED \
+  --add-exports jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED \
+  --add-exports jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED \
+  --add-exports jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED

settings.gradle

@@ -1 +1 @@
-rootProject.name = "jei-${mcversion}"
+rootProject.name = "jei-${minecraft_version}"