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Ajax call to retrieve hashmap

I have a hashmap which I have converted into a JSONObject. This JSONObject I am retrieving via a REST api using an AJAX call. What I wish to know is that how will the ajax look like in order to get the JSONObject which I can use afterwards.
My ajax call looks like this :
Ext.Ajax.request({
url : '...',
method:'GET',
scope : this,
success : function(result, request) {
console.log("2");
var data = Ext.decode(result.responseText)[0];
for (var i = 0; i < data.size(); i++) {
console.log("4. ");
}
}
})
The error which appears is
Ext.Error: You're trying to decode an invalid JSON String:

result.responseText returns the Invalid JSON String.Use this code
var responseArray = Ext.decode(response.responseText);
var data = responseArray.data;
console.log(data);
data variable will contain the JSON Object.

Parse the json string : receiving from a java code

I need to send the string s or json to ajax .done function. Here is the servlet code that has an object list to be sent for an ajax request.
Gson gson = new Gson();
Tester t = new Tester(10,"s");
Tester t2 = new Tester(20,"g");
LinkedList<Tester> list = new LinkedList<Tester>();
list.add(t); list.add(t2);
String s = gson.toJson(list);
I need to send the json to ajax. How could I do this? I could do :
out.println(s);
But how would I then parse the string? I need to appropriately put the json data received into the html table.
The current json output from out.println(s) is [{"x":10,"y":"s"},{"x":20,"y":"g"}]
js function that will receive json :
function getFeFeeds() {
$.ajax( {
url : '',
dataType : 'json',
type : 'GET'
}).done(function(message) {
}).fail(function(message) {
});
}}

You need to iterate over the received json and do your processing -
$.each(message, function(index, row) {
console.log(row[0].x);
console.log(row[0].y);
});
Also I would suggest set encoding so that you don't have any encoding related issues -
response.setCharacterEncoding("UTF-8");

How to convert an array from javascript to a java array?

I have this javascript code :
$.ajax({
url: 'assignRenameRuleToAgency.do',
data: {agenciesId:agenciesId,ruleId: JSON.stringify ( ruleIDd ) },
success: function(response) {
toastr.success(response.message);
}
})
in the server side I did this :
String ruleId = request.getParameter("ruleId");
String[] agenciesId = request.getParameterValues("agenciesId");
ruleId was correct, but agenciesId was null.

Get JSON response from ajax call and then convert that json response to Java objects using below solutions.
Click here to know the working examples

It is a single String, not an array! You can change your structure to
agenciesId: [agenciesId]
then it will be an array.
I would however map the JSON message to a single POJO, for example by using Jackson.

If the parameter for ruleId can be received the way you describe the following should work:
String ruleId = request.getParameter("ruleId");
String agenciesId = request.getParameter("agenciesId");

I found the solution :
String[] myJsonData = request.getParameterValues("json[]");

How to pass JSON array from Struts 2 action class to jQuery?

I creating a Java web application with an action file which generates data from database to a JSON array. Now, I want this JSON array to be passed to jQuery? How is that possible?
FYI. I applied Struts 2, Spring and Hibernate frameworks. I am not using PHP for this app.
Update:
This is my Struts 2 action method:
public static String jsonData = null;
public String generateJson() throws Exception
{
JSONObject json = null;
JSONArray jsonArray = new JSONArray();
this.records = this.recordManager.getAllRecords();
for (RecordEntity record : records)
{
json = new JSONObject();
json.put("id", record.getId());
json.put("firstname", record.getFirstName());
json.put("lastname", record.getLastName());
json.put("due", record.getDue());
json.put("email", record.getEmail());
json.put("website", record.getWebsite());
jsonArray.put(json);
}
System.out.println(jsonArray.toString());
jsonData = jsonArray.toString(); // jsonData will be passed to jQuery
return SUCCESS;
}
And this is my jQuery. I am using BootstrapTable so this is the structure, and I want the value of jsonData to be passed to this jQuery:
$('#record').bootstrapTable({
method : 'get',
data: jQuery.parseJSON(VALUE_OF_jsonData_HERE),
cache : ...
...
...
});

Using Ajax will help you,
refer this to get started, also do read about Ajax first to have a background

How to display the values java object array in jquery

I have returned the object array from scriptlet,
<%
List list = new BaseHibernateDAO().executeSQLQuery(queryString);
Object[] data = (Object[]) list.get(0);
out.print(data);
%>
When i tried to get values in jquery it is not showing,
$.ajax({
url: URL,
success: function(data) {
alert(data);
}
});
it is showing as => [Ljava.lang.Object;#22649e15

default toString return classname +# + hashcode.. You have to override toString method. refer this SO link..

A clean approach would be to use some JSON marshaller to convert your Java objects to JSON format. In Javascript you can easily process JSON as it is natively supported.
In Java EE 7 you can use the build-in JSON libraries (in earlier versions you can use e.g. Jackson):
JsonObject value = Json.createObjectBuilder()
.add("field1", "1")
.add("field2", "2")
.build();
JsonWriter writer = Json.createWriter(out);
writer.writeObject(value);