Upgrade to Kotlin 1.8.20

* Fix Scripting module to rely on the `kotlin-scripting-jsr223` instead
* Deprecate `KotlinScriptExecutor` in favor of `DefaultScriptExecutor` with `kotlin` as lang

build.gradle

@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlinVersion = '1.8.10'
+    ext.kotlinVersion = '1.8.20'
     ext.isCI = System.getenv('GITHUB_ACTION')
     repositories {
         gradlePluginPortal()
@@ -852,18 +852,13 @@ project('spring-integration-scripting') {
     description = 'Spring Integration Scripting Support'
     dependencies {
         api project(':spring-integration-core')
-        optionalApi ('org.jetbrains.kotlin:kotlin-script-util') {
-            exclude group: 'org.jetbrains.kotlin', module: 'kotlin-daemon-client'
-        }
-        optionalApi 'org.jetbrains.kotlin:kotlin-compiler-embeddable'
+        optionalApi 'org.jetbrains.kotlin:kotlin-scripting-jsr223'
         providedImplementation "org.graalvm.sdk:graal-sdk:$graalvmVersion"
         providedImplementation "org.graalvm.js:js:$graalvmVersion"
 
         testImplementation "org.jruby:jruby-complete:$jrubyVersion"
         testImplementation 'org.apache.groovy:groovy-jsr223'
         testImplementation "org.python:jython-standalone:$jythonVersion"
-
-        testRuntimeOnly 'org.jetbrains.kotlin:kotlin-scripting-compiler-embeddable'
     }
 
     tasks.withType(JavaForkOptions) {

spring-integration-scripting/src/main/java/org/springframework/integration/scripting/jsr223/KotlinScriptExecutor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2019 the original author or authors.
+ * Copyright 2019-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,29 +18,24 @@
 
 import javax.script.Bindings;
 import javax.script.ScriptEngine;
-
-import org.jetbrains.kotlin.script.jsr223.KotlinJsr223JvmLocalScriptEngineFactory;
+import javax.script.ScriptEngineManager;
 
 
 /**
  * An {@link AbstractScriptExecutor} for the Kotlin scripts support.
- * Uses {@link KotlinJsr223JvmLocalScriptEngineFactory} directly since there is
- * no {@code META-INF/services/javax.script.ScriptEngineFactory} file in CLASSPATH.
- * Also sets an {@code idea.use.native.fs.for.win} system property to {@code false}
- * to disable a native engine discovery for Windows: bay be resolved in the future Kotlin versions.
  *
  * @author Artem Bilan
  *
  * @since 5.2
+ *
+ * @deprecated since 6.1.6 in favor of {@link DefaultScriptExecutor} with {@code kotlin}
+ * as an argument.
  */
+@Deprecated(since = "6.1.6", forRemoval = true)
 public class KotlinScriptExecutor extends AbstractScriptExecutor {
 
-	static {
-		System.setProperty("idea.use.native.fs.for.win", "false");
-	}
-
 	public KotlinScriptExecutor() {
-		super(new KotlinJsr223JvmLocalScriptEngineFactory().getScriptEngine());
+		super(new ScriptEngineManager().getEngineByName("kotlin"));
 	}
 
 	@Override

spring-integration-scripting/src/main/java/org/springframework/integration/scripting/jsr223/ScriptExecutorFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -40,9 +40,6 @@ public static ScriptExecutor getScriptExecutor(String language) {
 		else if (language.equalsIgnoreCase("ruby") || language.equalsIgnoreCase("jruby")) {
 			return new RubyScriptExecutor();
 		}
-		else if (language.equalsIgnoreCase("kotlin")) {
-			return new KotlinScriptExecutor();
-		}
 		else if (language.equalsIgnoreCase("js") || language.equalsIgnoreCase("javascript")) {
 			return new PolyglotScriptExecutor("js");
 		}

spring-integration-scripting/src/test/java/org/springframework/integration/scripting/jsr223/DeriveLanguageFromExtensionTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -48,7 +48,7 @@ public void testParseLanguage() {
 				RubyScriptExecutor.class,
 				DefaultScriptExecutor.class,
 				PythonScriptExecutor.class,
-				KotlinScriptExecutor.class
+				DefaultScriptExecutor.class
 		};
 
 		Map<String, ScriptExecutingMessageProcessor> scriptProcessors =

src/reference/asciidoc/scripting.adoc

@@ -27,39 +27,25 @@ compile "org.springframework.integration:spring-integration-scripting:{project-v
 In addition, you need to add a script engine implementation, e.g. JRuby, Jython.
 
 Starting with version 5.2, Spring Integration provides a Kotlin Jsr223 support.
-You need to add these dependencies into your project to make it working:
+You need to add this dependency into your project to make it working:
 
 ====
 [source, xml, subs="normal", role="primary"]
 .Maven
 ----
 <dependency>
     <groupId>org.jetbrains.kotlin</groupId>
-    <artifactId>kotlin-script-util</artifactId>
-    <scope>runtime</scope>
-</dependency>
-<dependency>
-    <groupId>org.jetbrains.kotlin</groupId>
-    <artifactId>kotlin-compiler-embeddable</artifactId>
-    <scope>runtime</scope>
-</dependency>
-<dependency>
-    <groupId>org.jetbrains.kotlin</groupId>
-    <artifactId>kotlin-scripting-compiler-embeddable</artifactId>
+    <artifactId>kotlin-scripting-jsr223</artifactId>
     <scope>runtime</scope>
 </dependency>
 ----
 [source, groovy, subs="normal", role="secondary"]
 .Gradle
 ----
-runtime 'org.jetbrains.kotlin:kotlin-script-util'
-runtime 'org.jetbrains.kotlin:kotlin-compiler-embeddable'
-runtime 'org.jetbrains.kotlin:kotlin-scripting-compiler-embeddable'
+runtime 'org.jetbrains.kotlin:kotlin-scripting-jsr223'
 ----
 ====
 
-The `KotlinScriptExecutor` is selected by the provided `kotlin` language indicator or script file comes with the `.kts` extension.
-
 In order to use a JVM scripting language, a JSR223 implementation for that language must be included in your class path.
 The https://groovy-lang.org/[Groovy] and https://www.jruby.org[JRuby] projects provide JSR233 support in their standard distributions.