Development Assistance How to catch NoClassDefFoundError for NMS packages?

Hello. I have been trying to make something like bukkit version checker, but it seems that it ignores the if statements and gives me the NoClassDefFoundError already for the 1st statement..

Is there any way how to catch the error?

I have tried this, but it doesn't work:

Code:

        if (VersionHandler.is1_8_1()) {
            try {
                net.minecraft.server.v1_8_R1.IChatBaseComponent icbc = net.minecraft.server.v1_8_R1.ChatSerializer.a("{\"text\": \"" + text + "\"}");
                net.minecraft.server.v1_8_R1.PacketPlayOutChat bar = new net.minecraft.server.v1_8_R1.PacketPlayOutChat(icbc, (byte) 2);
                ((org.bukkit.craftbukkit.v1_8_R1.entity.CraftPlayer) player).getHandle().playerConnection.sendPacket(bar);
            } catch (NoClassDefFoundError ex) {}
        } else if (VersionHandler.is1_8_3()) {
            try {
                net.minecraft.server.v1_8_R2.IChatBaseComponent icbc = net.minecraft.server.v1_8_R2.IChatBaseComponent.ChatSerializer.a("{\"text\": \"" + text + "\"}");
                net.minecraft.server.v1_8_R2.PacketPlayOutChat bar = new net.minecraft.server.v1_8_R2.PacketPlayOutChat(icbc, (byte) 2);
                ((org.bukkit.craftbukkit.v1_8_R2.entity.CraftPlayer) player).getHandle().playerConnection.sendPacket(bar);
            } catch (NoClassDefFoundError ex) {}
        } else if (VersionHandler.is1_8_7()) {
            try {
                net.minecraft.server.v1_8_R3.IChatBaseComponent icbc = net.minecraft.server.v1_8_R3.IChatBaseComponent.ChatSerializer.a("{\"text\": \"" + text + "\"}");
                net.minecraft.server.v1_8_R3.PacketPlayOutChat bar = new net.minecraft.server.v1_8_R3.PacketPlayOutChat(icbc, (byte) 2);
                ((org.bukkit.craftbukkit.v1_8_R3.entity.CraftPlayer) player).getHandle().playerConnection.sendPacket(bar);
            } catch (NoClassDefFoundError ex) {}
        }

 

when it seems like it ignores the thirst if statements, it's probably the if statement itself that's wrong, how does your VersionHandler look like?

 

To do this, you must edit the constant pool... The entire class is loaded first then your code is executed, if you would like to circumvent the version checks, place it in a separate class.