Prism Launcher Java & JVM Configuration
Match the exact Java runtime (Java 21, Java 17, or Java 8) to your Minecraft version, tune min/max RAM, and pass GC JVM arguments.
Java 16 / Java 17 for Minecraft 1.17 – 1.17.1
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Minecraft 1.17 originally targeted Java 16 and runs cleanly on 64-bit Java 17 LTS in Prism Launcher. Applies to Minecraft 1.17 – 1.17.1.
- Configuration
- Java 16 / Java 17 for Minecraft 1.17 – 1.17.1
- Minecraft Range
- Minecraft 1.17 – 1.17.1
- Recommended Build
- Adoptium Temurin 17 (backward compatible with 1.17)
- JVM Flags
- -XX:+UseG1GC -Dsun.rmi.dgc.server.gcInterval=2147483646
Why Java 16 / Java 17 for Minecraft 1.17 – 1.17.1 matters for Minecraft 1.17 – 1.17.1
Minecraft 1.17 originally targeted Java 16 and runs cleanly on 64-bit Java 17 LTS in Prism Launcher.
Inside Prism Launcher, open **Settings** → **Java** (or override per instance under **Edit Instance** → **Settings**) and click **Auto-detect** or **Download** to select `Adoptium Temurin 17 (backward compatible with 1.17)`.
Recommended JVM flags and memory checks
- **JVM arguments:** `-XX:+UseG1GC -Dsun.rmi.dgc.server.gcInterval=2147483646`. Always click **Test** in the Java settings panel to verify the runtime passes Prism's architecture check.
- **64-bit verification:** Ensure the architecture column reads `x86_64` (or `arm64`), never 32-bit `x86`, so you can allocate more than 2 GB of RAM.
- **Download launcher:** Get the latest Windows build of Prism Launcher from /download.
Frequently asked questions
Which Minecraft versions need Java 16 / Java 17 for Minecraft 1.17 – 1.17.1?
It is designed for Minecraft 1.17 – 1.17.1.
Can Prism Launcher keep Java 8, Java 17, and Java 21 installed at the same time?
Yes. Prism Launcher lets you assign a different Java executable to each individual instance.
Get Prism Launcher
Windows, macOS & Linux
Free and open source. Sign in with the Microsoft account that owns Minecraft, then create your first instance.
