check an environment variable for null and get a file in spring el -


in our prod environment supply confdir parameter server.xml in tomcat .properties file, in dev , test environments use properties file in classpath.

like this

<context:property-placeholder location="${confdir:}/jdbc.properties, ${confdir:}/webservice.properties" order="1" ignore-resource-not-found="true" ignore-unresolvable="true"/> <context:property-placeholder location="classpath:jdbc.properties, classpath:webservice.properties" order="2"/>

now want load these properties files using util:properties tag, shown below, accessing them in @value , check null , if null assign default value

<util:properties id="classpathprops" location="classpath:jdbc.properties" local-override="false" /> <util:properties id="confdirprops" location="{confdir:}/jdbc.properties" local-override="false" />

the problem util:properties is throwing exception when don't supply confdir property.

can please me solve issue. tried various spel expression 

location="#{${confdir}?${confdir:}/jdbc.properties:''}"

to check whether confdir null or not, trials end in vain.

you don't need spel; use normal property placeholder default value...

<util:properties id="foo" location="${foo:classpath:}props"/>

then, if run no foo property, get...

class path resource [props] cannot opened because not exist

if run -dfoo=bar/, get...

class path resource [bar/props] cannot opened because not exist

if run -dfoo=file:/bar/

/bar/props (no such file or directory)

in ${foo:classpath:}props, value after first colon replacement used if property foo doesn't exist.


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