Convert to gradle toolchain for managing java/jdk versions

Toolchain auto-provisioning enabled via foojay resolver

Author: marko-radosavljevic

JShellAPI/build.gradle

@@ -1,3 +1,5 @@
+import org.gradle.jvm.toolchain.JavaLanguageVersion
+
 plugins {
     id 'java'
     id 'org.springframework.boot' version '3.0.1'
@@ -8,7 +10,12 @@ plugins {
 
 group 'org.togetherjava'
 version '1.0-SNAPSHOT'
-sourceCompatibility = '19'
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(19)
+    }
+}
 
 repositories {
     mavenCentral()

JShellWrapper/build.gradle

@@ -1,11 +1,18 @@
+import org.gradle.jvm.toolchain.JavaLanguageVersion
+
 plugins {
     id 'java'
     id 'com.google.cloud.tools.jib' version '3.3.0'
 }
 
 group 'org.togetherjava'
 version '1.0-SNAPSHOT'
-sourceCompatibility = '19'
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(19)
+    }
+}
 
 repositories {
     mavenCentral()
@@ -23,4 +30,4 @@ dependencies {
 
 tasks.named('test') {
     useJUnitPlatform()
-}
+}

settings.gradle

@@ -1,3 +1,7 @@
+plugins {
+    id "org.gradle.toolchains.foojay-resolver" version "0.7.0"
+}
+
 rootProject.name = "JShellPlaygroundBackend"
 include "JShellWrapper"
 include "JShellAPI"