Change By: Oleg Nenashev (07/Mar/15 11:10 PM)
Description: The plugin continuously adds the 'default' axis value even if there's an existing variable in the environment.Dynamic axis source: String parameter. 

The issue appears on the particular job only and cannot be reproduced on others. Job reloading does not resolve the issue.
 
Cause
 in DynamicAxis::rebuild  ( just a theory, cannot be reproduced on the test server ):
  - Race condition in 1. method flushes  the  internal axis values cache
2. method calls build.getEnvironment to get the variable value
3. an external
 plugin  (Perforce SCM in my case) calls DynamicAxis.getValues() to resolve variables
  - 4.  DynamicAxis :: . getValues()  returns an original data container without a copiyng => risk of  adds 'default', because  the  data corruption somewhere  cache is empty
....
X. method adds variables from the variable, but 'default' still exists in the list

System log on 1 config (reverse order):
  Mar 04, 2015 11:01:38 AM ca.silvermaplesolutions.jenkins.plugins.daxis.DynamicAxis
  FINE: Returning axis list [default, 1]
  Mar 04, 2015 11:01:38 AM ca.silvermaplesolutions.jenkins.plugins.daxis.DynamicAxis
  FINE: Variable value is '1'
  Mar 04, 2015 11:01:38 AM ca.silvermaplesolutions.jenkins.plugins.daxis.DynamicAxis
  FINE: Rebuilding axis names from variable 'NUMBER_FILES'
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