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Add warning for servers not running on Java 11

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Kyle Wood 2020-12-02 22:27:03 -08:00
parent 6859765e44
commit eb89fd5dea
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Spigot-Server-Patches/0611-Add-warning-for-servers-not-running-on-Java-11.patch Normal file
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@ -0,0 +1,81 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Kyle Wood <demonwav@gmail.com>
Date: Wed, 2 Dec 2020 21:58:45 -0800
Subject: [PATCH] Add warning for servers not running on Java 11
diff --git a/src/main/java/com/destroystokyo/paper/util/PaperJvmChecker.java b/src/main/java/com/destroystokyo/paper/util/PaperJvmChecker.java
new file mode 100644
index 0000000000000000000000000000000000000000..023123d52fbb458e6ee2d38e42c9651a5c7be728
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/util/PaperJvmChecker.java
@@ -0,0 +1,56 @@
+package com.destroystokyo.paper.util;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+public final class PaperJvmChecker {
+
+ private PaperJvmChecker() {}
+
+ public static void checkJvm() {
+ final Logger logger = LogManager.getLogger();
+
+ final String javaVersion = System.getProperty("java.version");
+ final int dotIndex = javaVersion.indexOf('.');
+
+ if (javaVersion.startsWith("1.")) {
+ // definitely old
+ PaperJvmChecker.printWarning(javaVersion, logger);
+ return;
+ }
+
+ final int endIndex = dotIndex == -1 ? javaVersion.length() : dotIndex;
+ final String version = javaVersion.substring(0, endIndex);
+
+ final int javaVersionNum;
+ try {
+ javaVersionNum = Integer.parseInt(version);
+ } catch (final NumberFormatException e) {
+ logger.warn("Failed to determine Java version; Could not parse {}", version, e);
+ PaperJvmChecker.printWarning(javaVersion, logger);
+ return;
+ }
+
+ if (javaVersionNum < 11) {
+ PaperJvmChecker.printWarning(javaVersion, logger);
+ }
+ }
+
+ private static void printWarning(final String version, final Logger logger) {
+ logger.warn("************************************************************");
+ logger.warn("* WARNING - YOU ARE RUNNING AN OUTDATED VERSION OF JAVA.");
+ logger.warn("* PAPER WILL STOP BEING COMPATIBLE WITH THIS VERSION OF");
+ logger.warn("* JAVA WHEN MINECRAFT 1.17 IS RELEASED.");
+ logger.warn("*");
+ logger.warn("* Please update the version of Java you use to run Paper");
+ logger.warn("* to at least Java 11. When Paper for Minecraft 1.17 is");
+ logger.warn("* released support for versions of Java before 11 will");
+ logger.warn("* be dropped.");
+ logger.warn("*");
+ logger.warn("* Current Java version: " + version);
+ logger.warn("*");
+ logger.warn("* Check this forum post for more information: ");
+ logger.warn("* https://papermc.io/java11");
+ logger.warn("************************************************************");
+ }
+}
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 0108a1a68572df562349688e93f8134cb14d6116..12d781f4ae6a46d0885972035870d5b5b62f5b8b 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -950,6 +950,8 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
LOGGER.info("Done ({})! For help, type \"help\"", doneTime);
// Paper end
+ com.destroystokyo.paper.util.PaperJvmChecker.checkJvm(); // Paper jvm version nag
+
org.spigotmc.WatchdogThread.tick(); // Paper
org.spigotmc.WatchdogThread.hasStarted = true; // Paper
Arrays.fill( recentTps, 20 );