title: Bad String in json response using Post man
body: <p>I am Returning string as shown below from a method on service call, when i call this service in Postman it returns <strong>Bad String</strong> .</p>
  
  <pre><code>@Override
  public synchronized String doDevicePair() throws SomeException    
  {
      String returnString = null;     
        /*some logic over here*/
  
               returnString = "{\"success\": true,   \"payload\": \"success!\", "
              + "{\"userIdA\":\""+user1.getUserId()+"\", \"userIdB\":\""+user2.getUserId()+"\", \"tagName\":\""+tagName+"\" }"+"}";
  
       return returnString;
        }
  </code></pre>
  
  <p>I think its giving Bad String response because of Wrong syntax of return String.
  so i tried</p>
  
  <pre><code>returnString = "{\"success\": true,   \"payload\": \"success!\", "
              + "{\"userIdA\":\""+user1.getUserId()+"\", \"userIdB\":\""+user2.getUserId()+"\", \"tagName\":\""+tagName+"\" }}";
  </code></pre>
  
  <p>//gives bad string reponse</p>
  
  <p>so i just checked by returning hardcoded string</p>
  
  <pre><code>returnString = "{\"success\": true,   \"payload\": \"succes\"  }";
  </code></pre>
  
  <p>This produces json response on service call , without any error</p>
  
  <p>Whats going wrong? Please help me on this</p>