how to know if an enterprise connection is alive

Question

I want to know if a connection is valid, this is an example of what I'm trying to do:

    EnterpriseConnection connection = new MyEnterpriseConnection();
    System.out.println("first " + connection.getUserInfo());
    connection.logout();
    if(connection == null){
    connection = new MyEnterpriseConnection();
    }
    System.out.println("second"  + connection.getUserInfo());

The first System.out is printed but the second is not because is not getting in the if condition, my question is: what is the condition i should use to validate if a connection is logged out to create a new one. I was looking for a method like isValid() or something like that in the EnterpriseConnection class but it isn't