config.properties substitution into applicationcontext.xml

[HockeyDave]

I'd like to extract out some Camel URI settings from Spring
applicationContext.xml into a config.properties to make it easier to manage
and more obvious to the IT deployment person what has to be customized in
the production environment.  However, if I try using property values, I get
an exception in that it tries to interpret the ${property} as a string.

config.properties
fromEmailServerUri=imap://[EMAIL 
PROTECTED]:143?password=abcde&consumer.delay=3600000&processOnlyUnseenMessages=true&deleteProcessedMessages=false


applicationContext.xml
        <context:property-placeholder location="classpath:config.properties" />
        
        <camel:camelContext id="camel">
                <camel:route>
                        <!--
                                Poll every hour
                                
&amp;deleteProcessedMessages=true&amp;debugMode=true&amp;
                        -->
                        <camel:from uri="${fromEmailServerUri}" />
                        <camel:to uri="bean:mailReader" />
                </camel:route>
        </camel:camelContext>

Exception in thread "main" org.apache.camel.NoSuchEndpointException: No
endpoint could be found for: ${fromEmailServerUri}
        at
org.apache.camel.util.CamelContextHelper.getMandatoryEndpoint(CamelContextHelper.java:54)
        at org.apache.camel.model.RouteType.resolveEndpoint(RouteType.java:100)
        at
org.apache.camel.impl.DefaultRouteContext.resolveEndpoint(DefaultRouteContext.java:102)
        at
org.apache.camel.impl.DefaultRouteContext.resolveEndpoint(DefaultRouteContext.java:108)
        at org.apache.camel.model.FromType.resolveEndpoint(FromType.java:73)
        at
org.apache.camel.impl.DefaultRouteContext.getEndpoint(DefaultRouteContext.java:77)
        at org.apache.camel.model.RouteType.addRoutes(RouteType.java:214)
        at org.apache.camel.model.RouteType.addRoutes(RouteType.java:90)
        at
org.apache.camel.impl.DefaultCamelContext.startRouteDefinitions(DefaultCamelContext.java:537)
        at
org.apache.camel.impl.DefaultCamelContext.doStart(DefaultCamelContext.java:529)
        at
org.apache.camel.spring.SpringCamelContext.doStart(SpringCamelContext.java:149)
        at org.apache.camel.impl.ServiceSupport.start(ServiceSupport.java:47)
        at
org.apache.camel.spring.SpringCamelContext.onApplicationEvent(SpringCamelContext.java:103)
        at
org.springframework.context.event.SimpleApplicationEventMulticaster$1.run(SimpleApplicationEventMulticaster.java:78)
        at
org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:49)
        at
org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:76)
        at
org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:275)
        at
org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:737)
        at
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:384)
        at
org.springframework.context.support.FileSystemXmlApplicationContext.<init>(FileSystemXmlApplicationContext.java:140)
        at
org.springframework.context.support.FileSystemXmlApplicationContext.<init>(FileSystemXmlApplicationContext.java:84)
        at com.contextweb.file.FolderWatcher.main(FolderWatcher.java:237)

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