topic How to access a Java variable? in Talend Studio

How to access a Java variable?

Anonymous — Sat, 16 Nov 2024 13:54:24 GMT

Hi,
I've got a tJava and set a variable String var1 = "test";
Now I want to access this variable somewhere else, for example in a MsgBox or what else.
How can I access it?
globalMap.get("tJava_1_...");
There is only ERROR_MESSAGE .. _1_currentPath doesn't work either.
Can someone help me?
Thank you.

Re: How to access a Java variable?

Anonymous — Sun, 21 Jun 2009 12:33:16 GMT

You need to use the globalMap map variable or create a context variable and use that. The scope of the tJava components is limited. You need a global scoped variable.

Re: How to access a Java variable?

Anonymous — Mon, 22 Jun 2009 03:07:00 GMT

Hello
Frist, you need to set it to a global var. eg:
String var1="test";
globalMap.put("varName",var1);
then, use this var like this:
(String)globalMap.get("varName")
Best regards

shong

Re: How to access a Java variable?

Anonymous — Mon, 22 Jun 2009 07:56:01 GMT

Hi,
it works within one job, but when I call tRunJob and try to System.out.println the variable in the childjob I see: null
For the tRunJob I've choose to: Transmit whole content.
What do I have to do if I want to pass this variable to a child?
Bye, Chris

Re: How to access a Java variable?

Anonymous — Mon, 22 Jun 2009 09:51:46 GMT

The globalMap instance is specific to a job, transmitting the context to a child job wont changes this.
If you intent to transmit a variable to child job, use the context then, it should be straitforward.

Re: How to access a Java variable?

Anonymous — Mon, 22 Jun 2009 10:04:21 GMT

Hello,
Existing two way to manage variable and parameter in a talend job.
1) globalMap is used to set variable in a Job, it's a hashmap
2) context var is used to set parameters
So, to achieve your goal,
1) you need to create context var in your childjob
2) With the tRunJob, use the context param tab, create a row, select the childjob context var in the first column, and set your expresion in the second one : globalMap.get("MyVar")
the transmit whole context checkbox is only for to transmit value of context var with same name from fatherjob to childjob.

Re: How to access a Java variable?

Anonymous — Mon, 22 Jun 2009 10:21:58 GMT

Eventually I got it .. I tried so hard to set a context in my fatherjob, I didn't get the idea to setup a context in the childjob!
Thank you for your help!

Re: How to access a Java variable?

_AnonymousUser — Wed, 26 Jan 2011 00:04:42 GMT

Hi,
How Can I share the global map between father an son job. I see that it's possible using context. In fact I have lots of parameters , so It will be hard to create a context variable for each parameter.
Thanks for your replay
James

Re: How to access a Java variable?

sbxr — Wed, 29 Jan 2020 14:16:19 GMT

How to do it for long data dype

Re: How to access a Java variable?

PhilHibbs — Wed, 29 Jan 2020 14:56:19 GMT

https://www.talendbyexample.com/talend-returning-values-from-subjobs.html

This is a technique for passing data down into, and back up from, child jobs. We use it a lot. We have a joblet that checks to see if context.sharedMap is initialized, and if not, creates a new ConcurrentHashMap. This joblet is placed at the start of every job that uses the context.sharedMap mechanism.