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Warn on strange @EventHandler return types (#7372)

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Jason 2022-01-18 11:47:54 -07:00 committed by GitHub
parent f1db23e47f
commit 7c3893c0c4
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patches/api/0357-Warn-on-strange-EventHandler-return-types.patch Normal file
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@ -0,0 +1,23 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jason Penilla <11360596+jpenilla@users.noreply.github.com>
Date: Tue, 18 Jan 2022 11:07:54 -0700
Subject: [PATCH] Warn on strange @EventHandler return types
diff --git a/src/main/java/org/bukkit/plugin/EventExecutor.java b/src/main/java/org/bukkit/plugin/EventExecutor.java
index 9026e108ccd3a88aee1267ee275137befa646455..e5f10ed4312529c082acf7de44af3639f77c8b8e 100644
--- a/src/main/java/org/bukkit/plugin/EventExecutor.java
+++ b/src/main/java/org/bukkit/plugin/EventExecutor.java
@@ -51,6 +51,12 @@ public interface EventExecutor {
Preconditions.checkArgument(m.getParameterCount() != 0, "Incorrect number of arguments %s", m.getParameterCount());
Preconditions.checkArgument(m.getParameterTypes()[0] == eventClass, "First parameter %s doesn't match event class %s", m.getParameterTypes()[0], eventClass);
ClassDefiner definer = ClassDefiner.getInstance();
+ if (m.getReturnType() != Void.TYPE) {
+ final org.bukkit.plugin.java.JavaPlugin plugin = org.bukkit.plugin.java.JavaPlugin.getProvidingPlugin(m.getDeclaringClass());
+ org.bukkit.Bukkit.getLogger().warning("@EventHandler method " + m.getDeclaringClass().getName() + (Modifier.isStatic(m.getModifiers()) ? '.' : '#') + m.getName()
+ + " returns non-void type " + m.getReturnType().getName() + ". This is an unsupported behavior which will be removed in a future version of Paper."
+ + "This should be reported to the developers of " + plugin.getDescription().getFullName() + ", (" + String.join(",", plugin.getDescription().getAuthors()) + ')');
+ }
if (Modifier.isStatic(m.getModifiers())) {
return new StaticMethodHandleEventExecutor(eventClass, m);
} else if (definer.isBypassAccessChecks() || Modifier.isPublic(m.getDeclaringClass().getModifiers()) && Modifier.isPublic(m.getModifiers())) {