Rendering the process instance diagram using bpmn.io javascript library for the XML rendering.

var BpmnNavigatedViewer = window.BpmnJS;
var bpmnNViewer = new BpmnNavigatedViewer({ container: '#canvas' });
/**
 * Open diagram in our viewer instance.
 *
 * @param {String} bpmnXML diagram to display
 */
function openDiagram(bpmnXML) {
 // import diagram
 bpmnNViewer.importXML(bpmnXML, function(err) {

  if (!err)

{    console.log('success!');    bpmnNViewer.get('canvas').zoom('fit-viewport');   }

else

{    console.log('something went wrong:', err);   }

 });
}
//var diagramUrl = 'https://cdn.rawgit.com/bpmn-io/bpmn-js-examples/dfceecba/starter/diagram.bpmn';
var diagramUrl = 'http://localhost:8080/spring-mvc-example/BPMNXML/1';

$.get(diagramUrl, openDiagram, 'text');