can't use systemProperties, elvis operator together in util:properties in Spring 3.1?

[dukehoops]

Hi,

I am trying to declare a Properties bean that would source local properties from:
a) location specified by

config-location

system property - if such property is present, else from
b) default-config.properties found in classpath

Seems like this should work...

<util:properties id="cfgProps"
    location="#{systemProperties['config-location'] ?: classpath:default-config.properties}" />

..but am getting this exception instead. What am I doing incorrectly?

Caused by: org.springframework.expression.spel.SpelParseExcep tion: EL1041E:(pos 43): After parsing a valid expression, there is still more data in the expression: 'colon(:)'
at org.springframework.expression.spel.standard.Inter nalSpelExpressionParser.doParseExpression(Internal SpelExpr essionParser.java:118)
at org.springframework.expression.spel.standard.SpelE xpressionParser.doParseExpression(SpelExpressionPa rser.jav a:56)
at org.springframework.expression.spel.standard.SpelE xpressionParser.doParseExpression(SpelExpressionPa rser.jav a:1)
at org.springframework.expression.common.TemplateAwar eExpressionParser.parseExpressions(TemplateAwareEx pression Parser.java:128)

[dukehoops]

duh. answer is wrap default value in single quotes ;-

<util:properties id="cfgProps"
    location="#{systemProperties['config-location'] ?: 'classpath:default-config.properties'}" />