NoSuchMethodException: net.minecraft.world.item.ItemStack.<init>(net.minecraft.world.item.Item,int)

[RegotlyLong]

java.lang.NoSuchMethodException: net.minecraft.world.item.ItemStack.(net.minecraft.world.item.Item,int) [12:53:57 WARN]: at java.base/java.lang.Class.getConstructor0(Class.java:3761) [12:53:57 WARN]: at java.base/java.lang.Class.getConstructor(Class.java:2442) at io.github.retrooper.packetevents.util.SpigotReflectionUtil.initConstructors(SpigotReflectionUtil.java:141) [12:53:57 WARN]: at io.github.retrooper.packetevents.util.SpigotReflectionUtil.init(SpigotReflectionUtil.java:360) [12:53:57 WARN]: at io.github.retrooper.packetevents.factory.spigot.SpigotPacketEventsBuilder$1.load(SpigotPacketEventsBuilder.java:103) [12:53:57 WARN]: at io.github.retrooper.packetevents.factory.spigot.SpigotPacketEventsBuilder$1.init(SpigotPacketEventsBuilder.java:137) [12:53:57 WARN]: at PacketEvents.getAPI().init();

java.lang.NullPointerException: Cannot invoke "java.lang.reflect.Field.get(Object)" because the return value of "com.github.retrooper.packetevents.util.reflection.Reflection.getField(java.lang.Class, java.lang.Class, int)" is null at io.github.retrooper.packetevents.util.SpigotReflectionUtil.getMinecraftServerConnectionInstance(SpigotReflectionUtil.java:406) at io.github.retrooper.packetevents.injector.SpigotChannelInjector.isServerBound(SpigotChannelInjector.java:63) at io.github.retrooper.packetevents.factory.spigot.SpigotPacketEventsBuilder$1.load(SpigotPacketEventsBuilder.java:115) at io.github.retrooper.packetevents.factory.spigot.SpigotPacketEventsBuilder$1.init(SpigotPacketEventsBuilder.java:137)

version 1.20.6 paper This server is running Paper version git-Paper-53 (MC: 1.20.6) (Implementing API version 1.20.6-R0.1-SNAPSHOT) (Git: 5729b29)

[RegotlyLong]

[booky10]

PacketEvents can't seem to find the ItemLike class (IMaterial with spigot mappings) and tries to use the normal Item class instead

Are you shading packetevents or using it as a separate plugin? If you're shading, are you compiling to mojang or spigot mappings?

[SamB440]

This was discussed on discord partially already: https://discord.com/channels/721686193061888071/755472595096174873/1238091719157743656

[IamMusavaRibica]

1. Paper uses original Mojang mappings instead of obfuscated mappings since 1.20.5
2. Are you using minimizeJar option? See #779

[booky10]

1. If you don't shade packetevents, Papers remapping of spigot plugins will work properly
2. This doesn't apply here, this issue is about packetevents failing to find a vanilla method