From 39d5351db6c384a64b5de29d3ebc45ceb4fbcee7 Mon Sep 17 00:00:00 2001 From: md_5 Date: Wed, 16 Jul 2014 17:24:21 +1000 Subject: [PATCH] Ease ClassLoader Deadlocks Where Possible When on Java 7 we can register the classloader as parallel capable to prevent deadlocks caused by certain scenarios. Due to the nature of PluginClassLoader this isn't completely safe, but we can make it safer by switching to concurrency focused collections. Either way this is far better than crashing the server. diff --git a/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java b/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java index cd843f4..7bf2fa6 100644 --- a/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java +++ b/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java @@ -48,7 +48,7 @@ import org.yaml.snakeyaml.error.YAMLException; public final class JavaPluginLoader implements PluginLoader { final Server server; private final Pattern[] fileFilters = new Pattern[] { Pattern.compile("\\.jar$"), }; - private final Map> classes = new HashMap>(); + private final Map> classes = new java.util.concurrent.ConcurrentHashMap>(); // Spigot private final Map loaders = new LinkedHashMap(); public static final CustomTimingsHandler pluginParentTimer = new CustomTimingsHandler("** Plugins"); // Spigot diff --git a/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java b/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java index 13f8633..4cffa13 100644 --- a/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java +++ b/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java @@ -17,7 +17,7 @@ import org.bukkit.plugin.PluginDescriptionFile; */ final class PluginClassLoader extends URLClassLoader { private final JavaPluginLoader loader; - private final Map> classes = new HashMap>(); + private final Map> classes = new java.util.concurrent.ConcurrentHashMap>(); // Spigot private final PluginDescriptionFile description; private final File dataFolder; private final File file; @@ -25,6 +25,30 @@ final class PluginClassLoader extends URLClassLoader { private JavaPlugin pluginInit; private IllegalStateException pluginState; + // Spigot Start + static + { + try + { + java.lang.reflect.Method method = ClassLoader.class.getDeclaredMethod( "registerAsParallelCapable" ); + if ( method != null ) + { + boolean oldAccessible = method.isAccessible(); + method.setAccessible( true ); + method.invoke( null ); + method.setAccessible( oldAccessible ); + org.bukkit.Bukkit.getLogger().log( java.util.logging.Level.INFO, "Set PluginClassLoader as parallel capable" ); + } + } catch ( NoSuchMethodException ex ) + { + // Ignore + } catch ( Exception ex ) + { + org.bukkit.Bukkit.getLogger().log( java.util.logging.Level.WARNING, "Error setting PluginClassLoader as parallel capable", ex ); + } + } + // Spigot End + PluginClassLoader(final JavaPluginLoader loader, final ClassLoader parent, final PluginDescriptionFile description, final File dataFolder, final File file) throws InvalidPluginException, MalformedURLException { super(new URL[] {file.toURI().toURL()}, parent); Validate.notNull(loader, "Loader cannot be null"); -- 2.1.4