How to check for the existence of undeclared variable in js

You can check for the existence of undeclared variable in javascript without getting ReferenceError:

if (x !== undefined){} // gets error if x undeclared
if (x !== 'undefined'){} // gets error if x undeclared
if (typeof x !== undefined){} // gets error because typeof x returns "undefined"

if (typeof x !== 'undefined'){} //right one

How to learn which vendor / version is using in jsf webapp? (MyFaces or Mojarra)

You can run the following code fragment in your application:

import javax.faces.context.FacesContext;

System.out.println("imp title: " + FacesContext.class.getPackage().getImplementationTitle());
System.out.println("impl vendor " + FacesContext.class.getPackage().getImplementationVendor());
System.out.println("imp version: " + FacesContext.class.getPackage().getImplementationVersion());

Sample output:

imp title: Apache MyFaces JSF-2.2 Core API
impl vendor The Apache Software Foundation
imp version: 2.2.11

Dynamically calling a class - method in java by using reflection

Dynamically call a method on a dynamically given class by using reflection:

import java.lang.reflect.Method;

try {
       String myClassName = "tr.com.xx.xx.xx.Example";
       String myMethodName = "exampleMethod";

       Class<?> myClassRef = Class.forName(myClassName);
       Object instanceOfMyClass = myClassRef.newInstance();
       
       //my object input types in order: param1(int), param2(String), param3(MyDTO), param4(List<MyDTO>)
       Method method = myClassRef.getDeclaredMethod(myMethodName, int.class, String.class, MyDTO.class, List.class);
       MyResult respoonse = (MyResult) method.invoke(instanceOfMyClass, param1, param2, param3, param4);
       System.out.println("response" + response.getX());

} catch(Exception e) {
       //logging
       System.out.println(e.getMessage());

Hint: shaking problems in Safari

Container has been shaking chidren on safari. However in chrome, ie, firefox it works well.

Advice:
Dynamically height calculation shakes children on safari.
Check for any dynamically calculation for height. Then try to give "position: fixed" or try to avoid giving height dynamically.