SessionChanger.java

package net.itstjf.accountmanager.util;

import java.lang.reflect.Field;

import net.minecraft.client.Minecraft;
import net.minecraft.util.Session;

public class SessionChanger {
	public static void setSession(Session newSession) throws Exception {
		Class<? extends Minecraft> mc = Minecraft.getMinecraft().getClass();
		try {
			Field session = null;

			for (Field field : mc.getDeclaredFields()) {
				if (field.getType().isInstance(newSession)) {
					session = field;
					System.out.println("Attempting Injection into Session.");
				}
			}

			if (session == null) {
				throw new IllegalStateException("No field of type " + Session.class.getCanonicalName() + " declared.");
			}

			session.setAccessible(true);
			session.set(Minecraft.getMinecraft(), newSession);
			session.setAccessible(false);
		} catch (Exception exeption) {
			exeption.printStackTrace();
			throw exeption;
		}
	}
}