How to set a Configuration node

[kienerj]

This is a recurring problem I have. I’m creating a component with config options. one or more of the configurations might have already bean set in the containing workflow and should automatically be reused.

I can’t set the config node to a flow variable because if it doesn’t exist, the component will fail.

java snippet also forces me to check the “replace” option or not so I can’t set a default value that way either? How can one check for existence of a flow variable?

What’s the best way to handle this?

[ipazin]

Hello @kienerj,

Java nodes can check for flow variable existence. Check here for more:

Check if flow variable exists

I want to add the potential error information coming out of a catch node to the json output of the workflow. I am using a JSON Transform to add the flow variables to the json. This works fine, as long as there are flow variables (errors). If there are no errors, the JSON Transform node fails and isn’t executing. How can I check if a flow variable exists and use that to control the workflow? Thanks!

Hope it help!

Br,
Ivan

[kienerj]

I finally came up with a simple solution for the problem. simply use Merge Variable and the top input comes from the component input node directly. So any value already set then takes precedence over what is configured on the component directly.