jinja2 template default not working when variable is not defined

[jepper]

Hello all, please can someone help me explain why this jinja2 template fail if I have not defined wildfly_memory_settings ?

JAVA_OPTS="-Xms{{ wildfly_memory_settings.Xms | default('64m') }}  -Xmx{{ wildfly_memory_settings.Xmx | default('512m') }} -XX:MaxPermSize=256m -verbose:gc -Djava.net.preferIPv4Stack=true"

The error: fatal: [targetbox] => {'msg': "AnsibleUndefinedVariable: One or more undefined variables: 'wildfly_memory_settings' is undefined", 'failed': True}

[David Karban]

Hi, 

it is because to test wildfly_memory_settings.Xms you need to access wildfly_memory_settings first and it is not defined. Unfortunatellz zou cannot use defautl this way.

David
Linux server specialist/Specialista na správu linuxových serverů
www.karban.eu

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[Brian Coca]

default only works on the 'last' var, so if you have to default the
main var also if that can be undefined.

{{ (wildfly_memory_settings|default({})).Xms | default('64m') }}

--
Brian Coca

[rektide]

This might work?

-Xms{{ (wildfly_memory_settings|default({'Xms': '64m'})).Xms }}

And if not, this ought:

-Xms{{ wildfly_memory_settings.Xms if wildfly_memory_settings is defined
else '64m' }}