[FIXED] how can I parametrize the spring constructor-arg injection based on the property file or environmental variable?

Issue

I have the following constructor in my spring application:

<bean id="metadata" class="org.springframework.security.saml.metadata.CachingMetadataManager">
    <constructor-arg>
        <list>
            <bean class="org.springframework.security.saml.metadata.ExtendedMetadataDelegate">
                <constructor-arg>
                    <bean class="org.opensaml.saml2.metadata.provider.FilesystemMetadataProvider">
                        <constructor-arg>
                            <value type="java.io.File">classpath:metadata/idp-test.xml</value>
                        </constructor-arg>
                        <property name="parserPool" ref="parserPool"/>
                    </bean>
                </constructor-arg>
                <constructor-arg>
                    <bean class="org.springframework.security.saml.metadata.ExtendedMetadata"/>
                </constructor-arg>
            </bean>
        </list>
    </constructor-arg>
</bean>

Now, I have 2 different xml config files, one for test env and one for prod env. Is there a way in the config above to have some kind of switch (or if-else perhaps?), based on which there would be either the idp-test.xml or a different one idp-prod.xml injected? I assume it would be based on the property file or e.g. environmental variable, that would store the info which environment is it (test or prod).

Solution

Are you looking for the profile feature which allow you to enable a bean only if certain profile is activated ?

If yes, you can first configuring a profile for the bean :

<beans profile="prod">
  <bean id="metadata" class="org.springframework.security.saml.metadata.CachingMetadataManager">
  </bean>
</bean>

<beans profile="test">
  <bean id="metadata" class="org.springframework.security.saml.metadata.CachingMetadataManager">
  </bean>
</bean>

And activating a particular profile by configuring the JVM system property spring.profiles.active in the command that start JVM :

 -Dspring.profiles.active="prod"

Or activate from the environment variable:

export spring_profiles_active=prod

In this case , only the bean with prod profile and without specifying any profile will be enabled.

Answered By - Ken Chan
Answer Checked By - Cary Denson (JavaFixing Admin)