[SPIGOT-7211] generateTree() with Consumer or Predicate is broken Created: 21/Dec/22  Updated: 25/Dec/24  Resolved: 23/Dec/22

Status: Resolved
Project: Spigot
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Bug Priority: Minor
Reporter: Lennart Assignee: Unassigned
Resolution: Fixed Votes: 0
Labels: api, bug
Environment:

Windows 11

Tested with 1.19.2 and 1.19.3, same outcome for both

This server is running CraftBukkit version 3610-Spigot-6198b5a-19df23a (MC: 1.19.2) (Implementing API version 1.19.2-R0.1-SNAPSHOT)
This server is running CraftBukkit version 3627-Spigot-d90018e-c810c3e (MC: 1.19.3) (Implementing API version 1.19.3-R0.1-SNAPSHOT)

Works as expected on spigot 1.18.2

Plugins (1): Testplugin (described below)

Version: This server is running CraftBukkit version 3627-Spigot-d90018e-c810c3e (MC: 1.19.3) (Implementing API version 1.19.3-R0.1-SNAPSHOT)
Guidelines Read: Yes

 Description   

I am working on a plugin where I want to cancel the placement of certain block while generating a tree. For this I would like to use the generateTree() method with a Predicate as argument, but this method appears to be broken, as well as the version that received a Consumer as argument.

It works as expected on spigot 1.18.2, but seems to be broken in 1.19.2 and 1.19.3.

I am using the following  code in my plugin code (simplified):

    @EventHandler
    public void onBlockInteract(PlayerInteractEvent e) {
        var RANDOM = new Random();
        var b = e.getClickedBlock();
        if (b == null) return;
        b.getWorld().generateTree(b.getLocation().add(0, 1, 0), RANDOM, TreeType.BIRCH, (s) -> {
            return true;
        });
    }

When generating a PlayerInteractEvent by clicking a block, the server throws an error:

[20:52:10] [Server thread/ERROR]: Could not pass event PlayerInteractEvent to Testplugin v0.1
org.bukkit.event.EventException: null
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[spigot-api-1.19.3-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[spigot-api-1.19.3-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:589) ~[spigot-api-1.19.3-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:576) ~[spigot-api-1.19.3-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.craftbukkit.v1_19_R2.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:511) ~[spigot-1.19.3-R0.1-SNAPSHOT.jar:3627-Spigot-d90018e-c810c3e]
        at net.minecraft.server.level.PlayerInteractManager.a(PlayerInteractManager.java:495) ~[spigot-1.19.3-R0.1-SNAPSHOT.jar:3627-Spigot-d90018e-c810c3e]
        at net.minecraft.server.network.PlayerConnection.a(PlayerConnection.java:1645) ~[spigot-1.19.3-R0.1-SNAPSHOT.jar:3627-Spigot-d90018e-c810c3e]
        at net.minecraft.network.protocol.game.PacketPlayInUseItem.a(PacketPlayInUseItem.java:37) ~[spigot-1.19.3-R0.1-SNAPSHOT.jar:3627-Spigot-d90018e-c810c3e]
        at net.minecraft.network.protocol.game.PacketPlayInUseItem.a(PacketPlayInUseItem.java:1) ~[spigot-1.19.3-R0.1-SNAPSHOT.jar:3627-Spigot-d90018e-c810c3e]
        at net.minecraft.network.protocol.PlayerConnectionUtils.lambda$0(PlayerConnectionUtils.java:31) ~[spigot-1.19.3-R0.1-SNAPSHOT.jar:3627-Spigot-d90018e-c810c3e]
        at net.minecraft.server.TickTask.run(SourceFile:18) ~[spigot-1.19.3-R0.1-SNAPSHOT.jar:3627-Spigot-d90018e-c810c3e]
        at net.minecraft.util.thread.IAsyncTaskHandler.d(SourceFile:156) ~[spigot-1.19.3-R0.1-SNAPSHOT.jar:3627-Spigot-d90018e-c810c3e]
        at net.minecraft.util.thread.IAsyncTaskHandlerReentrant.d(SourceFile:23) ~[spigot-1.19.3-R0.1-SNAPSHOT.jar:3627-Spigot-d90018e-c810c3e]
        at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:1154) ~[spigot-1.19.3-R0.1-SNAPSHOT.jar:3627-Spigot-d90018e-c810c3e]
        at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:1) ~[spigot-1.19.3-R0.1-SNAPSHOT.jar:3627-Spigot-d90018e-c810c3e]
        at net.minecraft.util.thread.IAsyncTaskHandler.x(SourceFile:130) ~[spigot-1.19.3-R0.1-SNAPSHOT.jar:3627-Spigot-d90018e-c810c3e]
        at net.minecraft.server.MinecraftServer.bh(MinecraftServer.java:1133) ~[spigot-1.19.3-R0.1-SNAPSHOT.jar:3627-Spigot-d90018e-c810c3e]
        at net.minecraft.server.MinecraftServer.x(MinecraftServer.java:1126) ~[spigot-1.19.3-R0.1-SNAPSHOT.jar:3627-Spigot-d90018e-c810c3e]
        at net.minecraft.util.thread.IAsyncTaskHandler.c(SourceFile:139) ~[spigot-1.19.3-R0.1-SNAPSHOT.jar:3627-Spigot-d90018e-c810c3e]
        at net.minecraft.server.MinecraftServer.i_(MinecraftServer.java:1110) ~[spigot-1.19.3-R0.1-SNAPSHOT.jar:3627-Spigot-d90018e-c810c3e]
        at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:1021) ~[spigot-1.19.3-R0.1-SNAPSHOT.jar:3627-Spigot-d90018e-c810c3e]
        at net.minecraft.server.MinecraftServer.lambda$0(MinecraftServer.java:301) ~[spigot-1.19.3-R0.1-SNAPSHOT.jar:3627-Spigot-d90018e-c810c3e]
        at java.lang.Thread.run(Thread.java:833) ~[?:?]
Caused by: java.lang.UnsupportedOperationException: Not supported yet.
        at org.bukkit.craftbukkit.v1_19_R2.util.DummyGeneratorAccess.s(DummyGeneratorAccess.java:184) ~[spigot-1.19.3-R0.1-SNAPSHOT.jar:3627-Spigot-d90018e-c810c3e]
        at org.bukkit.craftbukkit.v1_19_R2.CraftRegionAccessor.generateTree(CraftRegionAccessor.java:405) ~[spigot-1.19.3-R0.1-SNAPSHOT.jar:3627-Spigot-d90018e-c810c3e]
        at org.bukkit.craftbukkit.v1_19_R2.CraftRegionAccessor.generateTree(CraftRegionAccessor.java:321) ~[spigot-1.19.3-R0.1-SNAPSHOT.jar:3627-Spigot-d90018e-c810c3e]
        at org.bukkit.craftbukkit.v1_19_R2.CraftRegionAccessor.generateTree(CraftRegionAccessor.java:311) ~[spigot-1.19.3-R0.1-SNAPSHOT.jar:3627-Spigot-d90018e-c810c3e]
        at me.lennart99.TestPlugin.onBlockInteract(TestPlugin.java:24) ~[?:?]
        at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
        at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?]
        at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
        at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot-api-1.19.3-R0.1-SNAPSHOT.jar:?]
        ... 22 more

The same happens when using a Consumer instead of a Predicate (removing the return statement in the lambda).
Generated at Wed Apr 02 10:20:45 UTC 2025 using Jira 10.3.3#10030003-sha1:d220e3fefc8dfc6d47f522d3b9a20c1455e12b7b.