Hi,
I have a Camel project that uses Spring XML, with various settings in a
separate settings.properties file. And these settings are used both in plain
Spring XML (like arguments to java beans) and in Camel specific configuration
(like endpoint URI).
Here is the part of my camel-context.xml that configures this:
<bean id="settingsFileLocation"
class="java.lang.String">
<constructor-arg
type="java.lang.String" value="file:./config/settings.properties" />
</bean>
<bean id="propertiesBean"
class="org.springframework.beans.factory.config.PropertiesFactoryBean">
<property
name="ignoreResourceNotFound" value="false" />
<property
name="localOverride" value="true" />
<property name="locations">
<list>
<value>#{settingsFileLocation}</value>
</list>
</property>
</bean>
<!-- Camel expects this bean to have the id
'properties' -->
<bean id="properties"
class="org.apache.camel.component.properties.PropertiesComponent">
<property
name="ignoreMissingLocation" value="false" />
<property name="locations">
<list>
<value>#{settingsFileLocation}</value>
</list>
</property>
</bean>
<!-- This bean is needed in order for property
placeholder replacements to work in Spring bean properties -->
<!-- Also, we need to use a different
placeholderPrefix to avoid collision with Camel Simple Language expression
logic -->
<bean id="propertySourcesPlaceholderConfigurer"
class="org.springframework.context.support.PropertySourcesPlaceholderConfigurer">
<property name="properties"
value="#{propertiesBean}" />
<property
name="placeholderPrefix" value="@{" />
<property
name="localOverride" value="true" />
</bean>
And my settings.properties looks like something like this:
mainDirectory=/opt/main
inputDirectory=/opt/main/input
tempDirectory=/opt/main/temp
outputDirectory=/opt/main/output
otherDirectory=/opt/main/other
etc...
Also, there are one main settings.properties file, and then one
environment-specific file, that overrides some properties.
Now, since there are several properties for directories under the main
directory, instead of having to specify "/opt/main" for each one, I would like
to re-use the property mainDirectory somehow. Not only would it reduce the
manual workload if I would decide to move this folder to a different path, it
would mean that I would only have to define inputDirectory, tempDirectory etc
in the main settings.properties, and only need to define the mainDirectory
property in the environment specific settings.properties.
But... I can't figure out how to achieve this. If I use this syntax:
mainDirectory=/opt/main
inputDirectory={{mainDirectory}}/input
Then the {{mainDirectory}} isn't replaced when inputDirectory is used when
setting up a spring bean
And if I use this syntax:
mainDirectory=/opt/main
inputDirectory=#{mainDirectory}/input
Then I get:
Caused by: org.springframework.expression.spel.SpelEvaluationException:
EL1008E:(pos 0): Property or field 'mainDirectory' cannot be found on object of
type 'org.springframework.beans.factory.config.BeanExpressionContext' - maybe
not public?
Does it exist any solution to this problem? I use Camel 2.17.
Regards
/Jimi
