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Preload important classes such as Logger and JLine

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This is for 2 reasons:
1) Ensuring our log4j is mostly loaded at OUR version.
   I've seen stack traces with line numbers that do not match our version. This means that some
   plugin has shaded in log4j and their loaded version is mixing with ours....
   So by at least trying to load a bunch of log4j classes before we load plugins, we can be
   more sure mixed versions are not loading.

2) If the jar file is replaced while the server is runnimg class not found errors galore
   This will preloaod a bunch of classes commonly seen to error during shutdown due to this.

   The goal here is to help let the server shutdown gracefully as possible. Some plugins will
   still blow up here if they access a class that hadn't been loaded yet, but goal is to at least
   stop freezing the shutdown process as it does with JLine and Log4j errors requiring an external kill.

   Ideally you should not replace jars while the server is running, but it is something that happens in
   development for testing.

Updated test server to do a copy though to avoid this happening in Paper development.
This commit is contained in:
Aikar 2020-05-24 13:09:02 -04:00
parent 4657db9347
commit 8833b1ba15
4 changed files with 163 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
Spigot-API-Patches/Timings-v2.patch
View file

@ -14,6 +14,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+
+import static co.aikar.timings.TimingsManager.*;
+
+import org.bukkit.Bukkit;
+import org.jetbrains.annotations.NotNull;
+
+public class FullServerTickHandler extends TimingHandler {
@ -42,7 +43,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ @Override
+ public void stopTiming() {
+ super.stopTiming();
+ if (!isEnabled()) {
+ if (!isEnabled() || Bukkit.isStopping()) {
+ return;
+ }
+ if (TimingHistory.timedTicks % 20 == 0) {

137
Spigot-Server-Patches/Improved-Watchdog-Support.patch
View file

@ -40,6 +40,20 @@ This is to ensure that if main isn't truely stuck, it's not manipulating state w
This also moves all plugins who register "delayed init" tasks to occur just before "Done" so they
are properly accounted for and wont trip watchdog on init.
diff --git a/src/main/java/com/destroystokyo/paper/Metrics.java b/src/main/java/com/destroystokyo/paper/Metrics.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/com/destroystokyo/paper/Metrics.java
+++ b/src/main/java/com/destroystokyo/paper/Metrics.java
@@ -0,0 +0,0 @@ public class Metrics {
timer.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
+ if (MinecraftServer.getServer().hasStopped()) {
+ return;
+ }
submitData();
}
}, 1000 * 60 * 5, 1000 * 60 * 30);
diff --git a/src/main/java/net/minecraft/server/CrashReport.java b/src/main/java/net/minecraft/server/CrashReport.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/CrashReport.java
@ -210,6 +224,27 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
return new TickTask(this.ticks, runnable);
}
diff --git a/src/main/java/net/minecraft/server/PlayerChunkMap.java b/src/main/java/net/minecraft/server/PlayerChunkMap.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/PlayerChunkMap.java
+++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java
@@ -0,0 +0,0 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
MutableBoolean mutableboolean = new MutableBoolean();
do {
+ boolean isShuttingDown = world.getMinecraftServer().hasStopped(); // Paper
mutableboolean.setFalse();
list.stream().map((playerchunk) -> {
CompletableFuture completablefuture;
@@ -0,0 +0,0 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
return (IChunkAccess) completablefuture.join();
}).filter((ichunkaccess) -> {
return ichunkaccess instanceof ProtoChunkExtension || ichunkaccess instanceof Chunk;
- }).filter(this::saveChunk).forEach((ichunkaccess) -> {
+ }).filter(ichunkaccess1 -> saveChunk(ichunkaccess1, !isShuttingDown)).forEach((ichunkaccess) -> { // Paper - dont save async during shutdown
mutableboolean.setTrue();
});
} while (mutableboolean.isTrue());
diff --git a/src/main/java/net/minecraft/server/PlayerList.java b/src/main/java/net/minecraft/server/PlayerList.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/PlayerList.java
@ -268,6 +303,108 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
}
@Override
diff --git a/src/main/java/org/bukkit/craftbukkit/Main.java b/src/main/java/org/bukkit/craftbukkit/Main.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/org/bukkit/craftbukkit/Main.java
+++ b/src/main/java/org/bukkit/craftbukkit/Main.java
@@ -0,0 +0,0 @@ public class Main {
OptionSet options = null;
+ // Paper start - preload logger classes to avoid plugins mixing versions
+ tryPreloadClass("com.destroystokyo.paper.log.LogFullPolicy");
+ tryPreloadClass("org.apache.logging.log4j.core.Core");
+ tryPreloadClass("org.apache.logging.log4j.core.Appender");
+ tryPreloadClass("org.apache.logging.log4j.core.ContextDataInjector");
+ tryPreloadClass("org.apache.logging.log4j.core.Filter");
+ tryPreloadClass("org.apache.logging.log4j.core.ErrorHandler");
+ tryPreloadClass("org.apache.logging.log4j.core.LogEvent");
+ tryPreloadClass("org.apache.logging.log4j.core.Logger");
+ tryPreloadClass("org.apache.logging.log4j.core.LoggerContext");
+ tryPreloadClass("org.apache.logging.log4j.core.LogEventListener");
+ tryPreloadClass("org.apache.logging.log4j.core.AbstractLogEvent");
+ tryPreloadClass("org.apache.logging.log4j.message.AsynchronouslyFormattable");
+ tryPreloadClass("org.apache.logging.log4j.message.FormattedMessage");
+ tryPreloadClass("org.apache.logging.log4j.message.ParameterizedMessage");
+ tryPreloadClass("org.apache.logging.log4j.message.Message");
+ tryPreloadClass("org.apache.logging.log4j.message.MessageFactory");
+ tryPreloadClass("org.apache.logging.log4j.message.TimestampMessage");
+ tryPreloadClass("org.apache.logging.log4j.message.SimpleMessage");
+ tryPreloadClass("org.apache.logging.log4j.core.async.AsyncLogger");
+ tryPreloadClass("org.apache.logging.log4j.core.async.AsyncLoggerContext");
+ tryPreloadClass("org.apache.logging.log4j.core.async.AsyncQueueFullPolicy");
+ tryPreloadClass("org.apache.logging.log4j.core.async.AsyncLoggerDisruptor");
+ tryPreloadClass("org.apache.logging.log4j.core.async.RingBufferLogEvent");
+ tryPreloadClass("org.apache.logging.log4j.core.async.DisruptorUtil");
+ tryPreloadClass("org.apache.logging.log4j.core.async.RingBufferLogEventHandler");
+ tryPreloadClass("org.apache.logging.log4j.core.impl.ThrowableProxy");
+ tryPreloadClass("org.apache.logging.log4j.core.impl.ThrowableProxy$CacheEntry");
+ tryPreloadClass("org.apache.logging.log4j.core.impl.ExtendedClassInfo");
+ tryPreloadClass("org.apache.logging.log4j.core.impl.ExtendedStackTraceElement");
+ // Paper end
try {
options = parser.parse(args);
} catch (joptsimple.OptionException ex) {
@@ -0,0 +0,0 @@ public class Main {
} catch (Throwable t) {
t.printStackTrace();
}
+ // Paper start
+ // load some required classes to avoid errors during shutdown if jar is replaced
+ // also to guarantee our version loads over plugins
+ tryPreloadClass("com.destroystokyo.paper.util.SneakyThrow");
+ tryPreloadClass("com.google.common.collect.Iterators$PeekingImpl");
+ tryPreloadClass("com.google.common.collect.MapMakerInternalMap$Values");
+ tryPreloadClass("com.google.common.collect.MapMakerInternalMap$ValueIterator");
+ tryPreloadClass("com.google.common.collect.Iterables");
+ for (int i = 1; i <= 15; i++) {
+ tryPreloadClass("com.google.common.collect.Iterables$" + i, false);
+ }
+ tryPreloadClass("org.apache.commons.lang3.mutable.MutableBoolean");
+ tryPreloadClass("org.apache.commons.lang3.mutable.MutableInt");
+ tryPreloadClass("org.jline.terminal.impl.MouseSupport");
+ tryPreloadClass("org.jline.terminal.impl.MouseSupport$1");
+ tryPreloadClass("org.jline.terminal.Terminal$MouseTracking");
+ tryPreloadClass("co.aikar.timings.TimingHistory");
+ tryPreloadClass("co.aikar.timings.TimingHistory$MinuteReport");
+ tryPreloadClass("io.netty.channel.AbstractChannelHandlerContext");
+ tryPreloadClass("io.netty.channel.AbstractChannelHandlerContext$11");
+ tryPreloadClass("io.netty.channel.AbstractChannel$AbstractUnsafe$8");
+ tryPreloadClass("io.netty.util.concurrent.DefaultPromise");
+ tryPreloadClass("io.netty.util.concurrent.DefaultPromise$1");
+ tryPreloadClass("io.netty.util.internal.PromiseNotificationUtil");
+ tryPreloadClass("io.netty.util.internal.SystemPropertyUtil");
+ tryPreloadClass("org.bukkit.craftbukkit.scheduler.CraftScheduler");
+ tryPreloadClass("org.bukkit.craftbukkit.scheduler.CraftScheduler$1");
+ tryPreloadClass("org.bukkit.craftbukkit.scheduler.CraftScheduler$2");
+ tryPreloadClass("org.bukkit.craftbukkit.scheduler.CraftScheduler$3");
+ tryPreloadClass("org.bukkit.craftbukkit.scheduler.CraftScheduler$4");
+ tryPreloadClass("org.slf4j.helpers.MessageFormatter");
+ tryPreloadClass("org.slf4j.helpers.FormattingTuple");
+ tryPreloadClass("org.slf4j.helpers.BasicMarker");
+ tryPreloadClass("org.slf4j.helpers.Util");
+ // Minecraft, seen during saving
+ tryPreloadClass("net.minecraft.server.LightEngineLayerEventListener$Void");
+ tryPreloadClass("net.minecraft.server.LightEngineLayerEventListener");
+ // Paper end
+ }
+ }
+
+ // Paper start
+ private static void tryPreloadClass(String className) {
+ tryPreloadClass(className, true);
+ }
+ private static void tryPreloadClass(String className, boolean printError) {
+ try {
+ Class.forName(className);
+ } catch (ClassNotFoundException e) {
+ if (printError) System.err.println("An expected class " + className + " was not found for preloading: " + e.getMessage());
}
}
+ // Paper end
private static List<String> asList(String... params) {
return Arrays.asList(params);
diff --git a/src/main/java/org/bukkit/craftbukkit/util/ServerShutdownThread.java b/src/main/java/org/bukkit/craftbukkit/util/ServerShutdownThread.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/org/bukkit/craftbukkit/util/ServerShutdownThread.java

22
Spigot-Server-Patches/MC-Dev-fixes.patch
View file

@ -393,6 +393,28 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
j = SectionPosition.a(j, EnumDirection.UP);
++k;
if (k >= l) {
diff --git a/src/main/java/net/minecraft/server/LightEngineThreaded.java b/src/main/java/net/minecraft/server/LightEngineThreaded.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/LightEngineThreaded.java
+++ b/src/main/java/net/minecraft/server/LightEngineThreaded.java
@@ -0,0 +0,0 @@ public class LightEngineThreaded extends LightEngine implements AutoCloseable {
}
private void a(int i, int j, IntSupplier intsupplier, LightEngineThreaded.Update lightenginethreaded_update, Runnable runnable) {
- this.e.a((Object) ChunkTaskQueueSorter.a(() -> {
+ this.e.a(ChunkTaskQueueSorter.a(() -> { // Paper - decompile error
this.c.add(Pair.of(lightenginethreaded_update, runnable));
if (this.c.size() >= this.f) {
this.b();
@@ -0,0 +0,0 @@ public class LightEngineThreaded extends LightEngine implements AutoCloseable {
public void queueUpdate() {
if ((!this.c.isEmpty() || super.a()) && this.g.compareAndSet(false, true)) {
- this.b.a((Object) (() -> {
+ this.b.a((() -> { // Paper - decompile error
this.b();
this.g.set(false);
}));
diff --git a/src/main/java/net/minecraft/server/LootSelectorEntry.java b/src/main/java/net/minecraft/server/LootSelectorEntry.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/LootSelectorEntry.java

3
scripts/testServer.sh
View file

@ -87,6 +87,7 @@ fi
# JVM FLAGS
#
cp "$jar" paper.jar
baseargs="-server -Xms${PAPER_MIN_TEST_MEMORY:-512M} -Xmx${PAPER_TEST_MEMORY:-2G} -Dfile.encoding=UTF-8 -XX:MaxGCPauseMillis=150 -XX:+UseG1GC "
baseargs="$baseargs -DIReallyKnowWhatIAmDoingISwear=1 "
baseargs="$baseargs -XX:+UnlockExperimentalVMOptions -XX:G1NewSizePercent=40 -XX:G1MaxNewSizePercent=60 "
@ -94,7 +95,7 @@ baseargs="$baseargs -XX:InitiatingHeapOccupancyPercent=10 -XX:G1MixedGCLiveThres
baseargs="$baseargs -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=5100"
cmd="java ${PAPER_TEST_BASE_JVM_ARGS:-$baseargs} ${PAPER_TEST_EXTRA_JVM_ARGS} -jar $jar ${PAPER_TEST_APP_ARGS:-} nogui"
cmd="java ${PAPER_TEST_BASE_JVM_ARGS:-$baseargs} ${PAPER_TEST_EXTRA_JVM_ARGS} -jar paper.jar ${PAPER_TEST_APP_ARGS:-} nogui"
screen_command="screen -DURS papertest $cmd"
tmux_command="tmux new-session -A -s Paper -n 'Paper Test' -c '$(pwd)' '$cmd'"