DungeonForge 1.2.0 uses a Paper 1.20.1 baseline and Java 17-compatible bytecode. The tested 1.20/1.21 servers use Java 21; the tested 26.x servers use Java 25.
| Runtime | Build | Upstream channel | Functional probe |
|---|---|---|---|
| Paper 1.20.1 | 196 | Stable | Passed |
| Paper 1.20.6 | 151 | Stable | Passed |
| Paper 1.21.1 | 133 | Stable | Passed |
| Paper 1.21.4 | 232 | Stable | Passed |
| Paper 1.21.8 | 60 | Stable | Passed |
| Paper 1.21.10 | 130 | Stable | Passed |
| Paper 1.21.11 | 132 | Stable | Passed |
| Paper 26.1.2 | 74 | Stable | Passed |
| Paper 26.2 | 126 | Stable | Passed |
| Paper 26.3 | 30 | Alpha | Passed |
| Folia 1.20.1 | 17 | Alpha | Passed |
| Folia 1.21.11 | 14 | Stable | Passed |
| Folia 26.2 | 7 | Beta | Passed |
| Purpur 1.20.1 | 2062 | Stable | Passed |
| Purpur 26.2 | 2633 | Stable | Passed |
| Paper 1.20.2 | 318 | Stable | Passed |
| Paper 1.20.4 | 499 | Stable | Passed |
| Paper 1.20.5 | 22 | Alpha | Passed |
| Paper 1.21 | 130 | Stable | Passed |
| Paper 1.21.3 | 83 | Stable | Passed |
| Paper 1.21.5 | 114 | Alpha | Passed |
| Paper 1.21.6 | 48 | Stable | Passed |
| Paper 1.21.7 | 32 | Stable | Passed |
| Paper 1.21.9 | 59 | Alpha | Passed |
Probes test generated terrain, start-floor access, native NPC spawning with skin/equipment, compatibility constants, attribute identity, bosses, and cleanup. Player checks on Paper 1.20.1 and Folia 1.21.11 cover menus, language switching, linked NPC entry, two-player runs, and returns. Optional integrations and load testing remain separate.
Alpha/beta builds are experimental. A passing probe does not turn Paper 26.3 alpha into a stable release.
Supported software: Paper, Folia, and Purpur on qualified builds. This JAR requires Paper APIs and is not compatible with plain Spigot/CraftBukkit, Sponge, BungeeCord, Velocity, Minestom, or native mod/Bedrock runtimes. Mohist and Arclight are unqualified.
Folia requires setup: reserve unused arena/builder areas in an already loaded secondary world. Read the Folia setup guide.
Modern servers use native mannequins; older qualified servers use armor-stand NPCs with player-head skins and equipment. Never downgrade world/item data created by a newer Minecraft version.
Future builds
Use the exact tested builds above when choosing a server. Future builds and Minecraft 1.7 through 1.19 are not automatically supported.
References: Folia scheduling, Java requirements.