80 lines
4.2 KiB
Diff
80 lines
4.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Mariell Hoversholm <proximyst@proximyst.com>
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Date: Mon, 27 Apr 2020 12:31:59 +0200
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Subject: [PATCH] Prioritise own classes where possible
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This adds the server property `Paper.DisableClassPrioritization` to disable
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prioritization of own classes for plugins' classloaders.
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This value is by default not present, and this will therefore break any
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plugins which abuse behaviour related to not using their own classes
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while still loading their own. This is often an issue with failing to
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relocate or shade properly, such as when shading plugin APIs like Vault.
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A plugin's classloader will first look in the same jar as it is loading
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in for a requested class, then load it. It does not re-use other
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plugins' classes if it has the chance to avoid doing so.
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If a class is not found in the same jar as it is loading for and it does
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find it elsewhere, it will still choose the class elsewhere. This is
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intended behaviour, as it will only prioritise classes it has in its own
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jar, no other plugins' classes will be prioritised in any other order
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than the one they were registered in.
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The patch in general terms just loads the class in the plugin's jar
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before it starts looking elsewhere for it.
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diff --git a/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java b/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
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index 9d1f7cdf12029c8198792fd299f92be476040222..384edf9890dfbd1cddfdcac4db1ebe9a4d761f78 100644
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--- a/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
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+++ b/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
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@@ -50,6 +50,7 @@ import org.yaml.snakeyaml.error.YAMLException;
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*/
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public final class JavaPluginLoader implements PluginLoader {
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final Server server;
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+ private static final boolean DISABLE_CLASS_PRIORITIZATION = Boolean.getBoolean("Paper.DisableClassPrioritization"); // Paper
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private final Pattern[] fileFilters = new Pattern[]{Pattern.compile("\\.jar$")};
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private final Map<String, Class<?>> classes = new ConcurrentHashMap<String, Class<?>>();
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private final Map<String, java.util.concurrent.locks.ReentrantReadWriteLock> classLoadLock = new java.util.HashMap<String, java.util.concurrent.locks.ReentrantReadWriteLock>(); // Paper
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@@ -193,6 +194,11 @@ public final class JavaPluginLoader implements PluginLoader {
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@Nullable
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Class<?> getClassByName(final String name) {
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+ // Paper start - prioritize self
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+ return getClassByName(name, null);
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+ }
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+ Class<?> getClassByName(final String name, PluginClassLoader requester) {
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+ // Paper end
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// Paper start - make MT safe
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Class<?> cachedClass = classes.get(name);
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if (cachedClass != null) {
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@@ -204,6 +210,16 @@ public final class JavaPluginLoader implements PluginLoader {
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classLoadLockCount.compute(name, (x, prev) -> prev != null ? prev + 1 : 1);
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}
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lock.writeLock().lock();try {
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+ // Paper start - prioritize self
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+ if (!DISABLE_CLASS_PRIORITIZATION && requester != null) {
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+ try {
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+ cachedClass = requester.findClass(name, false);
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+ } catch (ClassNotFoundException cnfe) {}
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+ if (cachedClass != null) {
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+ return cachedClass;
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+ }
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+ }
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+ // Paper end-
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cachedClass = classes.get(name);
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// Paper end
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diff --git a/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java b/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java
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index 3a02dbe9d183bc907dcce081d8338d5716ed5242..28e5c6591fb594ca79ee92480cedc8f549e3fe01 100644
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--- a/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java
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+++ b/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java
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@@ -108,7 +108,7 @@ public final class PluginClassLoader extends URLClassLoader { // Spigot
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if (result == null) {
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if (checkGlobal) {
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- result = loader.getClassByName(name);
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+ result = loader.getClassByName(name, this); // Paper - prioritize self
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if (result != null) {
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PluginDescriptionFile provider = ((PluginClassLoader) result.getClassLoader()).description;
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