150 lines
3.4 KiB
Markdown
150 lines
3.4 KiB
Markdown
# Adding Java 21 to Your Launcher (For Minecraft 1.21.10)
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## The Issue
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Minecraft 1.21.10 requires **Java 21**, but your system has Java 25 (too new).
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## Quick Solution - Install Java 21 Locally (No Root Needed)
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### Step 1: Download Java 21
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```bash
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# Go to your launcher folder
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cd /home/admin/ai-lab/_projects/_minecraft/launcher/
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# Create java directory
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mkdir -p java
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# Download Adoptium Java 21 (portable tar.gz)
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cd java
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wget https://github.com/adoptium/temurin21-binaries/releases/download/jdk-21.0.5%2B11/OpenJDK21U-jdk_x64_linux_hotspot_21.0.5_11.tar.gz
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# Extract it
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tar xzf OpenJDK21U-jdk_x64_linux_hotspot_21.0.5_11.tar.gz
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# Verify
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ls -la
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# You should see: jdk-21.0.5+11/
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```
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### Step 2: Configure Launcher to Use It
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**Option A: Via Launcher GUI (Easiest)**
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1. Run your launcher: `bash start.sh`
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2. Go to **Settings** (gear icon)
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3. Click **Java** tab
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4. Under "Java Installation", click **"Auto-detect"** or **"Browse"**
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5. Navigate to: `/home/admin/ai-lab/_projects/_minecraft/launcher/java/jdk-21.0.5+11/bin/java`
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6. Click **OK**
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**Option B: Edit Config File Directly**
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```bash
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cd /home/admin/ai-lab/_projects/_minecraft/launcher/
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# Edit the config file
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nano bin/prismlauncher.cfg
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# Find or add these lines:
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JavaPath=/home/admin/ai-lab/_projects/_minecraft/launcher/java/jdk-21.0.5+11/bin/java
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JavaDetect=true
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# Save (Ctrl+X, Y, Enter)
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```
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### Step 3: Test It
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```bash
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# Run launcher
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cd /home/admin/ai-lab/_projects/_minecraft/launcher/
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bash start.sh
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# Create a 1.21.10 instance
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# It should now work without version errors!
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```
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## Alternative Java 21 Downloads
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If the above link doesn't work:
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### Amazon Corretto 21
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```bash
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cd java
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wget https://corretto.aws/downloads/latest/amazon-corretto-21-x64-linux-jdk.tar.gz
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tar xzf amazon-corretto-21-x64-linux-jdk.tar.gz
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```
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### Azul Zulu 21
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```bash
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cd java
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wget https://cdn.azul.com/zulu/bin/zulu21.38.21-ca-jdk21.0.5-linux_x64.tar.gz
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tar xzf zulu21.38.21-ca-jdk21.0.5-linux_x64.tar.gz
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```
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## Verify It's Working
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```bash
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# Test the Java version
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java/jdk-21.0.5+11/bin/java -version
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# Should output:
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# openjdk version "21.0.5"
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# OpenJDK Runtime Environment ...
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# OpenJDK 64-Bit Server VM ...
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```
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## Permanent Storage
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With this setup:
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- ✅ Java is stored **inside your launcher folder**
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- ✅ Portable - travels with the launcher
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- ✅ Works from USB drives
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- ✅ No root/sudo needed
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- ✅ Doesn't affect system Java
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## Folder Structure After Adding Java
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```
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launcher/
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├── start.sh
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├── bin/
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│ └── prismlauncher
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├── java/
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│ └── jdk-21.0.5+11/ ← Java 21 installed here
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│ ├── bin/
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│ │ └── java ← Point to this
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│ └── (other files)
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└── share/
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```
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## For Minecraft 1.21.10
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**Required Java Versions:**
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- Minimum: Java 21
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- Recommended: Java 21.0.5 or later
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**NOT Compatible:**
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- ❌ Java 8 (too old)
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- ❌ Java 17 (too old for 1.21)
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- ❌ Java 25 (too new, causes issues)
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## Quick Install Script
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Copy-paste this entire block to auto-install Java 21:
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```bash
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cd /home/admin/ai-lab/_projects/_minecraft/launcher/
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mkdir -p java && cd java
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wget https://github.com/adoptium/temurin21-binaries/releases/download/jdk-21.0.5%2B11/OpenJDK21U-jdk_x64_linux_hotspot_21.0.5_11.tar.gz
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tar xzf OpenJDK21U-jdk_x64_linux_hotspot_21.0.5_11.tar.gz
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cd ..
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echo "Java installed!"
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ls -la java/
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echo ""
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echo "Now configure your launcher to use:"
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echo "java/jdk-21.0.5+11/bin/java"
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```
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---
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**Updated:** 2026-04-13
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**For:** Minecraft 1.21.10
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**Java Version:** 21.0.5+11 (LTS)
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