Solved Set motd (using reflection)

Plugin version : 1.8 1.9 1.10 1.11 1.12
API : Spigot 1.8 - 1.9 - 1.10 - 1.11 - 1.12
IDE : Eclipse Oxygene A3
JDK : 10.0.1

Hello bukkit,
I have a error when y start this :

Code:

private static void setMotd(String str) {
     try {
       Class<?> craftserver = Class.forName("org.bukkit.craftbukkit." + getVersion() + ".CraftServer");
       Class<?> dedicatedPlayerList = craftserver.getMethod("getHandle").getReturnType();
       Class<?> dedicatedServer = dedicatedPlayerList.getMethod("getServer").getReturnType();
       dedicatedServer.getMethod("setMotd", String.class).invoke(Bukkit.getServer(), str);
     } catch (ClassNotFoundException | NoSuchMethodException | SecurityException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
       e.printStackTrace();
     }
   }

If you can help me, thank you !

Sorry, I'am french but bukkit.fr is down.

 

Yes but it's been a week since the site is in maintenance

Error :

Error (open) Error (close)

Code:

java.lang.IllegalArgumentException: object is not an instance of declaring class
[17:07:43 WARN]:  at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[17:07:43 WARN]:  at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
[17:07:43 WARN]:  at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
[17:07:43 WARN]:  at java.base/java.lang.reflect.Method.invoke(Unknown Source)
[17:07:43 WARN]:  at PACKAGE.setMotd(SetModtv1_8_R3.java:49)
[17:07:43 WARN]:  at PACKAGE.actualise(SetModtv1_8_R3.java:34)
[17:07:43 WARN]:  at PACKAGE.run(ActualseModt.java:13)
[17:07:43 WARN]:  at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71)
[17:07:43 WARN]:  at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350)
[17:07:43 WARN]:  at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:723)
[17:07:43 WARN]:  at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374)
[17:07:43 WARN]:  at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654)
[17:07:43 WARN]:  at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557)
[17:07:43 WARN]:  at java.base/java.lang.Thread.run(Unknown Source)

Line 49 = dedicatedServer.getMethod("setMotd", String.class).invoke(Bukkit.getServer(), str);

 

So how to use this method by reflect ?

 

The code without reflect :
((CraftServer) Bukkit.getServer()).getHandle().getServer().setMotd(String);
But I don't know how to convert to reflect...

 

@SeaMoon69
The only change you have to make to your original code is just replacing "craftserver" so that it is equal to Bukkit.getServer() casted to a CraftServer (instead of just getting the class object).

 

Thanks @Zombie_Striker

Solution (open) Solution (close)

Code:

Class<?> craftserver = Class.forName("org.bukkit.craftbukkit." + getVersion() + ".CraftServer");
            Class<?> dedicatedPlayerList = craftserver.getMethod("getHandle").getReturnType();
            Class<?> dedicatedServer = dedicatedPlayerList.getMethod("getServer").getReturnType();
            Object obj = dedicatedPlayerList.getMethod("getServer").invoke(craftserver.getMethod("getHandle").invoke(craftserver.cast(Bukkit.getServer())));
            dedicatedServer.getMethod("setMotd", String.class).invoke(obj, str);