fix: Remove deprecated APIs usage

Author: osipxd

build.gradle.kts

@@ -2,7 +2,7 @@ plugins {
     `kotlin-dsl`
     `maven-publish`
     groovy
-    kotlin("plugin.serialization") version "1.5.21"
+    kotlin("plugin.serialization") version "1.4.31"
     id("com.gradle.plugin-publish") version "0.15.0"
     id("com.github.ben-manes.versions") version "0.39.0"
 }
@@ -21,14 +21,20 @@ tasks.test.configure {
     useJUnitPlatform()
 }
 
+tasks.compileKotlin.configure {
+    kotlinOptions {
+        allWarningsAsErrors = true
+    }
+}
+
 repositories {
     mavenCentral()
 }
 
 dependencies {
     implementation("de.undercouch:gradle-download-task:4.1.2")
-    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.2.2")
-    implementation("com.charleskorn.kaml:kaml:0.35.0")
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.1.0")
+    implementation("com.charleskorn.kaml:kaml:0.31.0")
     testImplementation("junit:junit:4.13")
     testImplementation(platform("org.spockframework:spock-bom:2.0-groovy-3.0"))
     testImplementation("org.spockframework:spock-core")

src/main/kotlin/BukkitExtension.kt

@@ -1,9 +1,8 @@
 package ru.endlesscode.bukkitgradle
 
-import groovy.lang.Closure
+import org.gradle.api.Action
 import org.gradle.api.Project
 import org.gradle.kotlin.dsl.getByType
-import org.gradle.util.ConfigureUtil
 import org.slf4j.LoggerFactory
 import ru.endlesscode.bukkitgradle.extensions.warnSyntaxChanged
 import ru.endlesscode.bukkitgradle.meta.extension.PluginMetaImpl
@@ -31,25 +30,17 @@ public open class BukkitExtension(
         }
 
     @Deprecated("Use 'server { ... }' instead", ReplaceWith("server(body)"))
-    public fun run(body: Closure<out ServerConfigurationImpl>) {
+    public fun run(body: Action<ServerConfigurationImpl>) {
         logger.warnSyntaxChanged("bukkit.run { ... }", "bukkit.server { ... }")
-        ConfigureUtil.configure(body, server)
+        server(body)
     }
 
-    public fun server(body: Closure<out ServerConfigurationImpl>) {
-        ConfigureUtil.configure(body, server)
+    public fun server(body: Action<ServerConfigurationImpl>) {
+        body.execute(server)
     }
 
-    public fun server(body: ServerConfigurationImpl.() -> Unit) {
-        server.run(body)
-    }
-
-    public fun meta(body: Closure<out PluginMetaImpl>) {
-        ConfigureUtil.configure(body, meta)
-    }
-
-    public fun meta(body: PluginMetaImpl.() -> Unit) {
-        meta.run(body)
+    public fun meta(body: Action<PluginMetaImpl>) {
+        body.execute(meta)
     }
 
     @Deprecated("Use apiVersion instead of version.", ReplaceWith("apiVersion = version"))

src/main/kotlin/BukkitGradlePlugin.kt

@@ -3,7 +3,7 @@ package ru.endlesscode.bukkitgradle
 import org.gradle.api.JavaVersion
 import org.gradle.api.Plugin
 import org.gradle.api.Project
-import org.gradle.api.plugins.JavaPluginConvention
+import org.gradle.api.plugins.JavaPluginExtension
 import org.gradle.api.tasks.compile.JavaCompile
 import org.gradle.kotlin.dsl.*
 import ru.endlesscode.bukkitgradle.dependencies.Dependencies
@@ -36,7 +36,7 @@ public class BukkitGradlePlugin : Plugin<Project> {
             apply<DevServerPlugin>()
         }
 
-        with(convention.getPlugin<JavaPluginConvention>()) {
+        extensions.configure<JavaPluginExtension> {
             sourceCompatibility = JavaVersion.VERSION_1_8
             targetCompatibility = JavaVersion.VERSION_1_8
         }

src/main/kotlin/meta/PluginMetaPlugin.kt

@@ -7,9 +7,9 @@ import org.gradle.api.Plugin
 import org.gradle.api.Project
 import org.gradle.api.file.CopySpec
 import org.gradle.api.file.DuplicatesStrategy
-import org.gradle.api.plugins.JavaPluginConvention
+import org.gradle.api.plugins.JavaPluginExtension
 import org.gradle.kotlin.dsl.get
-import org.gradle.kotlin.dsl.getPlugin
+import org.gradle.kotlin.dsl.getByType
 import org.gradle.kotlin.dsl.named
 import org.gradle.kotlin.dsl.register
 import ru.endlesscode.bukkitgradle.bukkit
@@ -54,8 +54,8 @@ public class PluginMetaPlugin : Plugin<Project> {
 
     /** Finds and returns project metaFile if it exists. */
     private fun Project.findMetaFile(): File? {
-        val javaPlugin = convention.getPlugin<JavaPluginConvention>()
-        val mainSourceSet = javaPlugin.sourceSets["main"]
+        val java = extensions.getByType<JavaPluginExtension>()
+        val mainSourceSet = java.sourceSets["main"]
         val resourceDir = mainSourceSet.resources.srcDirs.first()
 
         return File(resourceDir, FILE_NAME).takeIf { it.isFile }