i've been using Commons Configuration on a particular project for several
years. until lately i have been using the DefaultExpressionEngine --- or at
least i believe i have since i've never called setExpressionEngine(). my
configuration is specified by a set of xml files, some of which use variable
interpolation (via ${} syntax) to define property values.
i recently had a case where the use of XPATH would be helpful in obtaining
certain configuration values. when i switched the expression engine to
XPathExpressionEngine, i was able to locate the necessary configuration
properties but their values resulted in the non-interpolated string. if i
use the DefaultExpressionEngine, the values are properly interpolated.
am i wrong in assuming that XPathExpressionEngine should transparently
variable interpolation like DefaultExpressionEngine does? i saw no mention
of this, one way or the other, in the Commons Configuration documentation.
thanks in advance for any guidance.
