Path.getComponent() in zk getting null - spreadsheet

Question

hi i m trying to open a blankspreadsheet when i select and click on "new button". below is my code
jsp
<div id="header" data-dojo-type="dijit/MenuBar"
data-dojo-props="region:'top'">
<div data-dojo-type="dijit/PopupMenuBarItem" id="project">
<span>Project</span>
<div data-dojo-type="dijit/Menu" id="projectMenu">
<div data-dojo-type="dijit/MenuItem"
data-dojo-props="iconClass:'dijitEditorIcon appCreateSharedPrj', onClick:function() {newspreadsheet()}">new</div>
</div>
</div>`
<!-- file menu bar end-->
<div width="100%" style="height: 100%;">
<zssjsp:page id = "page3">
<zssjsp:div width="100%" height ="100%" apply = "com.project.handler.prjHandler","resource.js.src.js">
<%-- <zssjsp:window id = "win" height="100%" width="100%" > --%>
<zssjsp:spreadsheet id = "ss"
vflex="1" hflex="1" maxVisibleRows="150" maxVisibleColumns="40"
showToolbar="true" showSheetbar="true" showFormulabar="true" />
</zssjsp:div>
</zssjsp:page>
</div>`
js code
newspreadsheet = function(){
prjHandler.newbook();
}
javacode
public void doRefresh() throws Exception {
Path path = new Path("//page3/ss");
doAfterCompose(path.getComponent("//page3/ss"));
}
public void newbook() throws Exception {
System.out.println("inside");
doRefresh();
System.out.println("inside");
ss.setSrc("/root/Desktop/book/hellozss.xlsx");
}
i m getting an null pointer error in this line doAfterCompose(path.getComponent("//page3/ss"));
any help would be greatly appreciated
thank you !!