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    Thrown to indicate that a method has been passed an illegal or inappropriate argument. Make sure your getter and setter methods have the same return/parameter types (that is, String for String, Integer for Integer).

Solutions on the web

via Stack Overflow by Kaelinator
, 1 year ago
Can not set final com.mojang.authlib.GameProfile field net.minecraft.server.v1_8_R3.EntityHuman.bH to java.lang.Class
via Stack Overflow by Scott Barnes
, 2 years ago
Can not set java.util.Map field RenderManager.entityRenderMap to java.util.HashMap
via Stack Overflow by Lena Bru
, 2 years ago
Can not set int field com.database.User.userID to java.lang.String
via Stack Overflow by elect
, 11 months ago
Can not set final int field uno.caps.Caps$Version.MINOR_VERSION to java.lang.reflect.Field
via by Unknown author, 2 years ago
Can not set java.lang.Long field to java.lang.Long
java.lang.IllegalArgumentException: Can not set final com.mojang.authlib.GameProfile field net.minecraft.server.v1_8_R3.EntityHuman.bH to java.lang.Class at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(Unknown Source) at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(Unknown Source) at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(Unknown Source) at sun.reflect.UnsafeQualifiedObjectFieldAccessorImpl.set(Unknown Source) at java.lang.reflect.Field.set(Unknown Source) at yt.Kaelinator.commands.Rename.disguisePlayer( at yt.Kaelinator.commands.Rename.onCommand( at org.bukkit.command.PluginCommand.execute( at org.bukkit.command.SimpleCommandMap.dispatch( at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand( at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand( at net.minecraft.server.v1_8_R3.PlayerConnection.a( at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(SourceFile:37) at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(SourceFile:9) at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$ at java.util.concurrent.Executors$ Source) at Source) at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) at net.minecraft.server.v1_8_R3.MinecraftServer.B( at net.minecraft.server.v1_8_R3.DedicatedServer.B( at net.minecraft.server.v1_8_R3.MinecraftServer.A( at