72 lines
3.4 KiB
Diff
72 lines
3.4 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Kyle Wood <demonwav@gmail.com>
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Date: Wed, 2 Dec 2020 21:58:45 -0800
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Subject: [PATCH] Add warning for servers not running on Java 16
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diff --git a/src/main/java/io/papermc/paper/util/PaperJvmChecker.java b/src/main/java/io/papermc/paper/util/PaperJvmChecker.java
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new file mode 100644
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index 0000000000000000000000000000000000000000..fdf3ff8894e5e202229d1be52fe3c92ea039ef15
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--- /dev/null
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+++ b/src/main/java/io/papermc/paper/util/PaperJvmChecker.java
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@@ -0,0 +1,48 @@
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+package io.papermc.paper.util;
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+
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+import org.apache.logging.log4j.LogManager;
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+import org.apache.logging.log4j.Logger;
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+
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+import java.util.regex.Matcher;
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+import java.util.regex.Pattern;
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+
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+public class PaperJvmChecker {
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+
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+ private static int getJvmVersion() {
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+ String javaVersion = System.getProperty("java.version");
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+ final Matcher matcher = Pattern.compile("(?:1\\.)?(\\d+)").matcher(javaVersion);
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+ if (!matcher.find()) {
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+ LogManager.getLogger().warn("Failed to determine Java version; Could not parse: {}", javaVersion);
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+ return -1;
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+ }
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+
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+ final String version = matcher.group(1);
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+ try {
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+ return Integer.parseInt(version);
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+ } catch (final NumberFormatException e) {
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+ LogManager.getLogger().warn("Failed to determine Java version; Could not parse {} from {}", version, javaVersion, e);
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+ return -1;
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+ }
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+ }
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+
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+ public static void checkJvm() {
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+ if (getJvmVersion() < 16) {
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+ final Logger logger = LogManager.getLogger();
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+ logger.warn("************************************************************");
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+ logger.warn("* WARNING - YOU ARE RUNNING AN OUTDATED VERSION OF JAVA.");
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+ logger.warn("* PAPER WILL STOP BEING COMPATIBLE WITH THIS VERSION OF");
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+ logger.warn("* JAVA WHEN MINECRAFT 1.17 IS RELEASED.");
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+ logger.warn("*");
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+ logger.warn("* Please update the version of Java you use to run Paper");
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+ logger.warn("* to at least Java 16. When Paper for Minecraft 1.17 is");
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+ logger.warn("* released support for versions of Java before 16 will");
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+ logger.warn("* be dropped.");
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+ logger.warn("*");
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+ logger.warn("* Current Java version: {}", System.getProperty("java.version"));
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+ logger.warn("*");
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+ logger.warn("* Check this forum post for more information: ");
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+ logger.warn("* https://papermc.io/java16");
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+ logger.warn("************************************************************");
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+ }
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+ }
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+}
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diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
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index 9bd2255d31bcfd4574f8d1caf598f9141aa9e3c1..c7432ccffc024f171a2868b4eb0dca4860b7f8c4 100644
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--- a/src/main/java/net/minecraft/server/MinecraftServer.java
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+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
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@@ -1128,6 +1128,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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LOGGER.info("Done ({})! For help, type \"help\"", doneTime);
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// Paper end
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+ io.papermc.paper.util.PaperJvmChecker.checkJvm(); // Paper jvm version nag
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org.spigotmc.WatchdogThread.tick(); // Paper
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org.spigotmc.WatchdogThread.hasStarted = true; // Paper
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Arrays.fill( recentTps, 20 );
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