Hi,

we upgraded from jenkins 2.47 to 2.50 since then nearly all of our ant build steps are failing.

I found out why :

We have following checks in our ANT Scripts:

<fail unless="env.ANT_HOME"
message="SYSTEMCONFIGFAILURE: Variable ANT_HOME must be set!"
/>

Problem is we are using property 

<property environment="env"/>

And "env" is suddenly empty - nothing else changed, ANT_HOME for example is set but check is failing.

I didn't find any clue in jenkins changelog or here in JIRA so im filing this isssue.