Update mcr.microsoft.com/devcontainers/java Docker tag to v3

* Moving back to Java 17 compatibility. I'll change demo-remote a little later, because otherwise I have to break the project for some time.

* Prepares version 0.1.3

.devcontainer/devcontainer.json

@@ -1,6 +1,6 @@
 {
   "name": "Java",
-  "image": "mcr.microsoft.com/devcontainers/java:1-21",
+  "image": "mcr.microsoft.com/devcontainers/java:3-21",
   "features": {
     "ghcr.io/devcontainers/features/java:1": {
       "version": "none",

.idea/misc.xml

@@ -4,7 +4,7 @@
   <component name="FrameworkDetectionExcludesConfiguration">
     <file type="web" url="file://$PROJECT_DIR$" />
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_24" project-jdk-name="temurin-21" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" project-jdk-name="temurin-21" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>

CLAUDE.md

@@ -66,7 +66,8 @@ The parser extracts `meta[property^=og:]` tags and builds structured data models
 
 ## Development Notes
 
-- **JVM Toolchain**: Java 24 (see `jvmToolchain(24)` in build files)
+- **JVM Toolchain**: Java 17 (see `jvmToolchain(17)` in build files)
+- **Minimum Java Version**: Java 17 (required by Ksoup dependency)
 - **Testing**: CI matrix tests on Java 17 and 23 via GitHub Actions
 - **Dependencies**: Core library uses Ksoup (v0.2.5) for HTML parsing and network requests
 - **Maven Coordinates**: Group `fr.lengrand`, artifact `opengraphkt`, currently at `0.1.2-SNAPSHOT`

CONTRIBUTING.md

@@ -6,7 +6,7 @@ Thank you for your interest in contributing to OpenGraphKt! This document provid
 
 ### Prerequisites
 
-- Java 24 (JVM toolchain)
+- Java 17 or later (JVM toolchain configured for Java 17)
 - Gradle 8.14.3+ (wrapper included)
 - Git
 

demo-remote/build.gradle.kts

@@ -10,7 +10,7 @@ repositories {
 }
 
 dependencies {
-    implementation("fr.lengrand:opengraphkt:0.1.2")
+    implementation("fr.lengrand:opengraphkt:0.1.3")
     testImplementation(kotlin("test"))
 }
 
@@ -19,7 +19,7 @@ tasks.test {
 }
 
 kotlin {
-    jvmToolchain(24)
+    jvmToolchain(17)
 }
 
 application {

demo/build.gradle.kts

@@ -24,7 +24,7 @@ tasks.test {
 }
 
 kotlin {
-    jvmToolchain(24)
+    jvmToolchain(17)
 }
 
 application {

opengraphkt/build.gradle.kts

@@ -5,7 +5,7 @@ plugins {
 }
 
 group = "fr.lengrand"
-version = "0.1.3-SNAPSHOT"
+version = "0.1.4-SNAPSHOT"
 
 repositories {
     mavenCentral()
@@ -33,8 +33,16 @@ tasks.jar {
     }
 }
 
+java {
+    sourceCompatibility = JavaVersion.VERSION_17
+    targetCompatibility = JavaVersion.VERSION_17
+}
+
 kotlin {
-    jvmToolchain(24)
+    jvmToolchain(17)
+    compilerOptions {
+        jvmTarget.set(org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_17)
+    }
 }
 
 mavenPublishing {

scrape-test/build.gradle.kts

@@ -24,5 +24,5 @@ tasks.test {
     useJUnitPlatform()
 }
 kotlin {
-    jvmToolchain(24)
+    jvmToolchain(17)
 }