The type Java.util.Map$Entry canot be resolved

I have created a web project in eclipse, which works fine, but when i add the Hashmap it gives me the error The type Java.util.Map$Entry canot be resolved.

I have seen many discussions on the same issue but could not get a solution. Can someone help me please.

package com.balu.loginApp.bean;

import java.util.HashMap; import java.util.Map;

public class LoginAuthenitication {

Map<String, String> users = new HashMap<String, String>();

public LoginAuthenitication()
{
    users.put("balu", "Balamurali CL");
    users.put("swathi", "Swathi RL");
}

public boolean loginAuthenitications(String userName, String passWord)
{
    if (passWord== null || passWord.trim() == "")
    {
        return false;
    }
    else
        return true;
}