The Indie Stone: Java-based Project Zomboid mods unsupported
The studio says only Lua-based modding is officially supported and that Java-based mods can break without warning after updates.
The Indie Stone has stated that Java-based mods for Project Zomboid, along with third-party loaders and frameworks that alter the game's underlying implementation, are not officially supported and are used at players' own risk, according to pcgamesn.com.
The studio said it only officially supports Lua-based modding. It added that Java-based mods will be fundamentally broken by game updates without warning.
The developer also said it cannot provide security protections or technical support for Java-based mods, and that it can only investigate bug reports that can be replicated in unmodded games.
The Indie Stone recommended that players look for open-source mods or builds that can be reproduced, and check community reporting and feedback. It said the policy is not a judgement on individual mods, their creators, or players using them.
Background: first-person mod releases
In August 2026, the First Person View mod was released, built with Project Zomboid's Lua tools. In September 2026, Project Viewpoint and pz3d were released, both built in Java and installed via the third-party Zombie Buddy tool from GitHub. Earlier in 2026, Project Zomboid had an incident involving mods on the Steam Workshop.
Quick answers
Does Project Zomboid officially support Java-based mods?
No. The Indie Stone said it only officially supports Lua-based modding, and that Java-based mods, third-party loaders and frameworks are not officially supported.
What happens to Java-based Project Zomboid mods after a game update?
The studio warned that they will be fundamentally broken by game updates without warning.
Can The Indie Stone help with bugs caused by Java-based mods?
The studio said it cannot provide security protections or technical support for Java-based mods, and can only investigate bug reports that can be replicated in unmodded games.