Fix game freeze when connecting to Hypixel

[Copilot]

Three issues combined to cause the game to freeze when connecting to/from Hypixel.

Root Causes & Fixes

• Main thread blocked on disconnect (EventRegistry.java): Wrapper.stop() (WebSocket teardown with network I/O) was called directly on the Minecraft main thread in onDisconnectedFromServerEvent. Moved to a named background thread; isInSkyblock = false still set immediately to halt SkyBlock processing.

• Spurious SkyBlock detection (EventHandler.java): checkIfInSkyblock condition s.contains("E") matched virtually any Hypixel scoreboard title ("HYPIXEL", "BEDWARS", "SKYWARS", etc.), triggering unnecessary stop()/startConnection() pairs on every scoreboard poll:

  // Before — fires on any server with "E" in scoreboard title
  if ((s.contains("SKYBLOCK") || s.contains("E")) && !isInSkyblock)
  
  // After — fires only on actual SkyBlock
  if (s.contains("SKYBLOCK") && !isInSkyblock)

• Synchronous mod hashing at startup (SkyCofl.java): cacheMods() was computing SHA-256 checksums for every mod file on the main thread during preInit. Moved to a background thread so it no longer blocks game load.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• maven.architectury.dev
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED -Xmx2g -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -cp /home/REDACTED/.gradle/wrapper/dists/gradle-8.8-bin/dl7vupf4psengwqhwktix4v1/gradle-8.8/lib/gradle-launcher-8.8.jar -javaagent:/home/REDACTED/.gradle/wrapper/dists/gradle-8.8-bin/dl7vupf4psengwqhwktix4v1/gradle-8.8/lib/agents/gradle-instrumentation-agent-8.8.jar org.gradle.launcher.daemon.bootstrap.GradleDaemon 8.8 (dns block)
• maven.fabricmc.net
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED -Xmx2g -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -cp /home/REDACTED/.gradle/wrapper/dists/gradle-8.8-bin/dl7vupf4psengwqhwktix4v1/gradle-8.8/lib/gradle-launcher-8.8.jar -javaagent:/home/REDACTED/.gradle/wrapper/dists/gradle-8.8-bin/dl7vupf4psengwqhwktix4v1/gradle-8.8/lib/agents/gradle-instrumentation-agent-8.8.jar org.gradle.launcher.daemon.bootstrap.GradleDaemon 8.8 (dns block)
• maven.minecraftforge.net
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED -Xmx2g -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -cp /home/REDACTED/.gradle/wrapper/dists/gradle-8.8-bin/dl7vupf4psengwqhwktix4v1/gradle-8.8/lib/gradle-launcher-8.8.jar -javaagent:/home/REDACTED/.gradle/wrapper/dists/gradle-8.8-bin/dl7vupf4psengwqhwktix4v1/gradle-8.8/lib/agents/gradle-instrumentation-agent-8.8.jar org.gradle.launcher.daemon.bootstrap.GradleDaemon 8.8 (dns block)
• repo.essential.gg
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED -Xmx2g -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -cp /home/REDACTED/.gradle/wrapper/dists/gradle-8.8-bin/dl7vupf4psengwqhwktix4v1/gradle-8.8/lib/gradle-launcher-8.8.jar -javaagent:/home/REDACTED/.gradle/wrapper/dists/gradle-8.8-bin/dl7vupf4psengwqhwktix4v1/gradle-8.8/lib/agents/gradle-instrumentation-agent-8.8.jar org.gradle.launcher.daemon.bootstrap.GradleDaemon 8.8 (dns block)
• repo.spongepowered.org
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED -Xmx2g -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -cp /home/REDACTED/.gradle/wrapper/dists/gradle-8.8-bin/dl7vupf4psengwqhwktix4v1/gradle-8.8/lib/gradle-launcher-8.8.jar -javaagent:/home/REDACTED/.gradle/wrapper/dists/gradle-8.8-bin/dl7vupf4psengwqhwktix4v1/gradle-8.8/lib/agents/gradle-instrumentation-agent-8.8.jar org.gradle.launcher.daemon.bootstrap.GradleDaemon 8.8 (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)