RESOLVED Game Crashing - Caused by: org.spongepowered.asm.mixin.throwables.ClassMetadataNotFoundException: java.lang.System
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Well, when I log in to the server, sometimes within an hour, sometimes within a minute, the server closes and informs me that there was a Ticking entity error. Below is the crash report -
Try switching to Windowed or Borderless Window mode in Minecraft. These modes make it easier for the recorder to capture gameplay, as it still has access to the display without the game taking up all of the graphics resources. -
This forum is for Forge, not NeoForge. Please go to them for support. -
Forge version: 55.0.0 Minecraft version: 1.21.5 Downloads: As this is the start of a new version, it is recommended that you check the downloads page and use the latest version to receive any bug fixes. Downloads page Intro: Good evening! Today, we have released our initial build of Forge 55.0 for Minecraft 1.21.5. 1.21.5 is the newest member of the 1.21 family of versions, which was released yesterday on March 25, 2025. As a reminder, the first minor (X.0) of a Forge version is a beta. Forge betas are marked as such on the bottom left of the title screen and are candidates for any breaking changes. Additionally, there are a couple of important things to note about this update, which I've made sure to mention in this post as well. Feel free to chat with us about bugs or these implementation changes on GitHub and in our Discord server. As always, we will continue to keep all versions of 1.21 and 1.20 in active support as covered by our tiered support policy. Cheers, happy modding, and good luck porting! Rendering Refactor For those who tuned in to Minecraft Live on March 22, 2025, you may already know that Mojang have announced their intention to bring their new Vibrant Visuals overhaul to Java in the future. They've taken the first steps toward this by refactoring how rendering pipelines and render types are handled internally. This has, in turn, made many of Forge's rendering APIs that have existed for years obsolete, as they (for the most part) can be done directly in vanilla. If there was a rendering API that was provided by Forge which you believe should be re-implemented, we're happy to discuss on GitHub through an issue or a pull request. Deprecation of weapon-like ToolActions In 1.21.5, Minecraft added new data components for defining the characteristics of weapons in data. This includes attack speed, block tags which define efficient blocks, and more. As such, we will begin marking our ToolActions solution for this as deprecated. ToolActions were originally added to address the problem of creating modded tools that needed to perform the same actions as vanilla tools. There are still a few tool actions that will continue to be used, such as the shears tool action for example. There are some existing Forge tool actions that are currently obsolete and have no effect given the way the new data components are implemented. We will continue to work on these deprecations and invite you to chat with us on GitHub or Discord if you have any questions.
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In summary, a full mod to adjust mining progress in such a specific way does not yet exist in its exact form, but it is possible to find mods that change certain aspects of progression (e.g. "Harder Ores").
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