Feature request: NullPointer with several objects in same source code line - easily spot the object being null

[Josef Lehner]

Dear Hotspot-Runtime team,

every once in a while every Java programmer encounters a 
NullPointerException and it is often hard to find out which object is 
null, especially in production where debugging isn't possible.

It would be fantastic if the jvm could blame the object causing the 
NullPointerException.

Thanks in advance.

Best regards

Josef

String s1=null;
String s2=null;
s1.concat(s2.toString()); // Line 7

Exception in thread "main" java.lang.NullPointerException <<< should be 
something like >Exception in thread "main" 
java.lang.NullPointerException: s2 is null<
     at stuff.Example.main(Example.java:7)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
     at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
     at java.lang.reflect.Method.invoke(Method.java:487)
     at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)