function login(response, info){
if (response.authResponse) {
var accessToken = response.authResponse.accessToken;
userInfo.innerHTML = '<img src="https://graph.facebook.com/' + info.id + '/picture">' + info.name
+ "<br /> Your Access Token: " + accessToken;
button.innerHTML = 'Logout';
showLoader(false);
}
}

I have to pass the access token to a java servlet or java class how to do it
(UserService.java)

My English is not very well.Do you know Ajax,it can make js pass the access token to a java servlet

Yes i know ajax but can you tell me how to do it??

first,you need to create ajax engine:var xmlHttp = new XMLHttpRequest();it depends on your browser.
second:xmlHttp.open("get",url,true);
xmlHttp.send(null)
xmlHttp.onreadystatechange = callback;
function callback(){
if(xmlHttp.readyState == 4){ document.getElementById("id").innerHTML = xmlHttp.responseText;
}
}
actually,you can google or baidu,there are many things what you want

are you kidding me ?i don't think he or her konw baidu.