How to add an image into Liferay 7 Control Menu - liferay

Question

I am working on Liferay 7 and want to add an image in the centre of the Control Menu. How can this be done?
I have followed the steps mentioned over the official website on how to customise the Control Menu.
Few specific questions I have are:
Is there a defined template of JSP file that needs to be used?
Is there a defined name of the JSP file that needs to be used?
The code I am using is:
package portlet;
import java.io.IOException;
import java.lang.reflect.GenericArrayType;
import java.util.Locale;
import javax.servlet.RequestDispatcher;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.osgi.service.component.annotations.Component;
import com.liferay.product.navigation.control.menu.BaseJSPProductNavigationControlMenuEntry;
import com.liferay.product.navigation.control.menu.BaseProductNavigationControlMenuEntry;
import com.liferay.product.navigation.control.menu.ProductNavigationControlMenuEntry;
import com.liferay.product.navigation.control.menu.constants.ProductNavigationControlMenuCategoryKeys;
#Component(
immediate = true,
property = {
"com.liferay.portlet.display-category=category.sample",
"product.navigation.control.menu.category.key=" + ProductNavigationControlMenuCategoryKeys.TOOLS,
"product.navigation.control.menu.category.order:Integer=19",
"com.liferay.portlet.instanceable=true",
"javax.portlet.security-role-ref=power-user,user",
"javax.portlet.display-name=Customproductnavigationcontrolmenuentry Portlet"
},
service = ProductNavigationControlMenuEntry.class
)
public class CustomproductnavigationcontrolmenuentryPortlet extends BaseJSPProductNavigationControlMenuEntry implements ProductNavigationControlMenuEntry {
#Override
public boolean includeIcon(HttpServletRequest request, HttpServletResponse response) throws IOException {
// TODO Auto-generated method stub
RequestDispatcher requestdispacher = request.getRequestDispatcher("/view.jsp");
try{
requestdispacher.include(request, response);
}
catch(Exception e){
e.printStackTrace();
}
return true;
}
#Override
public boolean includeBody(HttpServletRequest request, HttpServletResponse response) throws IOException {
// TODO Auto-generated method stub
RequestDispatcher requestdispacher = request.getRequestDispatcher("/view.jsp");
try{
requestdispacher.include(request, response);
}
catch(Exception e){
e.printStackTrace();
}
return true;
}
#Override
public String getIconJspPath() {
// TODO Auto-generated method stub
return null;
}
}
And on deploying this on the server, I get the following error:
ERROR [http-nio-8080-exec-10][IncludeTag:128] Current URL /web/guest generates exception: java.lang.NullPointerException
java.lang.NullPointerException
at com.liferay.product.navigation.control.menu.BaseJSPProductNavigationControlMenuEntry.include(BaseJSPProductNavigationControlMenuEntry.java:84)
at com.liferay.product.navigation.control.menu.BaseJSPProductNavigationControlMenuEntry.includeIcon(BaseJSPProductNavigationControlMenuEntry.java:68)
at org.apache.jsp.control_005fmen.....