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AntiPopup

AntiPopup is a standalone Paper plugin that removes the unsafe-server chat popup and limits Minecraft's chat-reporting path. This mrfdev fork is built specifically for Paper 26.2 with Java 25 bytecode; historical Minecraft, Spigot, BungeeCord, and Velocity targets are not part of the active build.

Player guide: AntiPopup on docs.1moreblock.com

Compatibility

Component Target
Server Paper 26.2
Paper development bundle 26.2.build.34-alpha
Java bytecode Java 25
Tested runtime Paper 26.2 build 56 on Java 26.0.1
Plugin version 13.2
Main command /antipopup
Artifact AntiPopup-13.2-j25-mc26.2.jar

The active Gradle project includes only spigot, shared, nms, and v26.2. Older source directories remain for upstream history but are not compiled or packaged.

What It Does

  • Marks compatible server-list responses as preventing chat reports.
  • Hides the unsafe-server popup through the applicable server-data and join-game packet flags when show-popup is disabled.
  • Cancels chat-session updates and, by default, outgoing chat headers.
  • When block-chat-reports is enabled, replaces Paper 26.2 player-chat packets with decorated system-chat packets before they reach each player.
  • Optionally removes the [Not Secure] prefix from matching Minecraft server log messages.
  • Can optionally restore clickable URL behavior through its Bukkit chat listener, with the compatibility trade-off documented in the configuration.

AntiPopup does not provide rewards, costs, cooldowns, progression, player data, or PlaceholderAPI placeholders.

Commands

Command Sender Description
/antipopup Player/console Shows the same friendly overview as info.
/antipopup info Player/console Shows the installed version, starting command, and clickable canonical documentation link.
/antipopup setup Local server console only Sets enforce-secure-profile=false in the configured properties file and restarts when a change is needed.
/antipopup reload Local server console only Reloads config.yml; startup-bound features still require a restart.

The command permission is antipopup.commands and defaults to everyone. The setup and reload restrictions are also enforced in code, so granting the permission does not expose those operations to players, command blocks, or RCON.

Documentation

No placeholders page is included because this project does not implement any placeholders.

Installation Summary

  1. Stop the Paper 26.2 server.
  2. Back up plugins/AntiPopup/config.yml and server.properties when updating an existing installation.
  3. Remove older AntiPopup jars from the server's top-level plugins/ folder.
  4. Copy AntiPopup-13.2-j25-mc26.2.jar into plugins/.
  5. Start with Java 25, or the separately verified Java 26.0.1 runtime, and confirm the log contains [AntiPopup] Hooked on 26.2.

No companion dependency jar is required. Do not install this build on a proxy or on another Paper/Minecraft version.

Build and Test

JDK 25 is required as the Gradle toolchain:

./gradlew clean build

The normal build runs the focused command tests and writes the deployable shaded plugin to:

build/libs/AntiPopup-13.2-j25-mc26.2.jar

The artifact shades PacketEvents, BoostedYAML, bStats, Adventure support, and FoliaLib. The root unshaded jar task is disabled to avoid producing an undeployable artifact.

Persistence, Metrics, and Updates

Persistent project state is limited to plugins/AntiPopup/config.yml. /antipopup setup or auto-setup can also modify the configured server.properties file. There is no database or per-player store.

bStats metrics are disabled by default. When enabled, AntiPopup uses metrics ID 16308 and reports whether ViaVersion is enabled in addition to bStats' standard plugin metrics. PacketEvents update checks are disabled.

Verification and Limitations

This fork has completed a clean Gradle build and a startup/enable/shutdown smoke test on Paper 26.2-56-main@8cd4f47 with Java 26.0.1. The built JAR contained Java 25 class files and only the v26_2 NMS implementation.

folia-supported: true is declared and FoliaLib is used for scheduled work, but this fork has not completed a dedicated Folia runtime test. ViaVersion client translation combinations have not been certified as a compatibility matrix.

Source, Support, and License

AntiPopup is distributed under the GNU General Public License v3.0. See LICENSE.