topic Re: null values in context String variable in Talend Studio

null values in context String variable

_AnonymousUser — Mon, 25 Nov 2013 13:33:01 GMT

Hi all,
I detected a bad behavior in 5.0 (maybe corrected with last version).
-1 parent job (transmit whole context enabled)
--context.strVar1 = "toto"
--context.strVar2 not set
-1 child job
Default value context.strVar1 : null (type String)
Default value context.strVar2 : null (type String)
I transmit values through the child job context.

In child job :
tJava :
System.out.println("strVar1 ="+context.strVar1);
System.out.println("strVar2 ="+context.strVar2);
Result :
strVar1 =toto
strVar2 =null ====>NOT CORRECT it must be : strVar2 =
null value is recognized as a String !

Re: null values in context String variable

Anonymous — Tue, 26 Nov 2013 02:59:14 GMT

Hi,
Did you check the KB article on TalendHelpCenterassing a value from a parent Job to a child Job to see if there any missing in your job setting.
Best regards
Sabrina

Re: null values in context String variable

Anonymous — Tue, 17 Dec 2013 15:16:52 GMT

I can't get it - IMHO the referenced link/article does not solve the problem.
Look at this: http://www.talendbyexample.com/talend-null-handling.html
It seems to be a slightly bug or misconception in Talend.

Re: null values in context String variable

Anonymous — Wed, 18 Dec 2013 08:15:19 GMT

After I have tested with one parent job and a calling child job there was no transfer of "null" strings via Context. I have tested with Talend 5.3.1.
It seems to be a problem in Talend history.

Re: null values in context String variable

Anonymous — Wed, 25 Dec 2013 09:37:23 GMT

Hi,
Did you open a jira issue on Talend Bug Tracker?
Best regards
Sabrina

Re: null values in context String variable

Anonymous — Wed, 29 Jan 2014 23:22:33 GMT

The "null"-Problem is caused by the Studio because it fills new String typed context variables with the String value "null". Go to the Context view and erase these nulls and that it. It is a bit annoying but not impossible.
But I agree with you that should not happen!

Re: null values in context String variable

Anonymous — Wed, 14 Oct 2015 14:15:09 GMT

This is how Java works. Try this.....
String myNullVal = null;
System.out.println("The result of concatenating a String with a NULL is...." + myNullVal);
This is not a Talend issue, it is just the way Java works.