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POHow to return an json Object and catch in in Ajax call in HTML
 

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    <p>I have a simple tree structure of information in my D3 code. The D3 script is calling json from the script d3.json() function and the resulting json is giving the tree structure data.Now I have a couple of information that will come from database and hit the Servlet. I have to make the json dynamically in the Servlet so that it can change upon user response.Here is the script &amp; the json I used..</p> <p>This is my HTML file from where I made an Ajax call to the Servlet. The Ajax is calling the Servlet ,but there is an error in getting back the response. I am getting an "error occurred" message.When I am running the servlet...... </p> <pre><code> &lt;script src="http://code.jquery.com/jquery-latest.min.js"&gt;&lt;/script&gt; &lt;script&gt; function doajax(){ $.ajax({ url: "AccountServlet", type: "post", dataType: "json", error:function(){ alert("error occured!!!"); }, success:function(data){ alert(data.fullName + "\n" + data.mobileNo); } }); } &lt;/script&gt; </code></pre> <p></p> <p>This is the Html from where i am tring to get the response back this file just calls a Servlet.But in the response i am getting a error occuree message ...</p> <p>IN the accountServlet i am creating the json like this</p> <pre><code> ArrayList&lt;DistinctSourceCount&gt; countList = new ArrayList&lt;DistinctSourceCount&gt;(); countList.add(new DistinctSourceCount("Jan", 1800)); countList.add(new DistinctSourceCount("Feb", 1500)); countList.add(new DistinctSourceCount("March", 2000)); countList.add(new DistinctSourceCount("April", 1550)); countList.add(new DistinctSourceCount("May", 1000)); countList.add(new DistinctSourceCount("June", 1700)); countList.add(new DistinctSourceCount("July", 1400)); countList.add(new DistinctSourceCount("Aug", 1900)); countList.add(new DistinctSourceCount("Sept", 1000)); countList.add(new DistinctSourceCount("Oct", 1500)); countList.add(new DistinctSourceCount("Nov", 1100)); countList.add(new DistinctSourceCount("Dec", 2000)); Gson gson = new Gson(); JsonArray arrayObj = new JsonArray(); for (int i = 0; i &lt; countList.size(); i++) { DistinctSourceCount count = countList.get(i); JsonElement linObj = gson.toJsonTree(count); arrayObj.add(linObj); } JsonObject myObj = new JsonObject(); myObj.addProperty("success", true); myObj.add("topList", arrayObj); myObj.addProperty("totalCount", countList.size()); System.out.println(myObj.toString()); System.out.close(); </code></pre> <p>This is my code I have done so far.Can anyone help me about how to create the json object in Servlet and getting the response back the script??please anyone help</p>
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    1. COit's better you have a RESTful framework like [Jersey](https://jersey.java.net/) or [resteasy](http://www.jboss.org/resteasy)
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