PropertyPlaceholderConfigurer reads from XML File (Apache Commons Configuration)

Question

Is there a possibility to configure the Spring PropertyPlaceholderConfigurer to read from properties.xml, via Apache Commons Configuration?

Answer 1

The easiest way (maybe not the nicest though) would be to subclass the PropertyPlaceholdeConfigurer, load the commons configuration there and then pass it to the superclass:

public class TestPlaceholderConfigurer extends PropertyPlaceholderConfigurer
{
    public TestPlaceholderConfigurer()
    {
        super();
    }

    @Override
    protected void processProperties(ConfigurableListableBeanFactory beanFactoryToProcess, Properties props)
            throws BeansException
    {
        XMLConfiguration config = new XMLConfiguration("config.xml");
        Properties commonsProperties = config.getProperties("someKey")
        // Or something else with the configuration
        super.processProperties(beanFactoryToProcess, commonsProperties);
    }
}

Then you just use this class as the placeholderConfig:

<bean id="placeholderConfig"
    class="com.exampl.TestPlaceholderConfigurer ">
    <!-- ... -->
</bean>

Answer 2

Here is a solution using spring modules. I don't know how current this is, but even if it isn't you could probably easily take the code and make it work with current versions.

Answer 3

I found a solution with the help of seanizer and springmodule

<!-- Composite configuration -->
<bean id="configuration" class="org.springmodules.commons.configuration.CommonsConfigurationFactoryBean">
    <property name="configurations">
        <list>
            <!-- User specifics -->
            <bean class="org.apache.commons.configuration.XMLConfiguration">
                <constructor-arg type="java.net.URL" value="file:cfg.xml" />
            </bean>
        </list>
    </property>
</bean>

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="properties" ref="configuration"/>
</bean>

<bean id="testConfig" class="uvst.cfg.TestConfiguration">
    <property name="domain" value="${some.prop}"></property>
</bean>

class TestConfiguration

public class TestConfiguration {
    private String domain;
    public String getDomain() {
        return domain;
    }
    public void setDomain(String domain) {
        this.domain = domain;
    }
}

jUnit Testclass

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration( { "/applicationContextTest.xml" })

public class ApacheCommonCfg2Spring extends AbstractJUnit4SpringContextTests {

    private TestConfiguration tcfg;

    @Test
    public void configuration(){
        tcfg  = this.applicationContext.getBean("testConfig", TestConfiguration.class);
        System.out.println(tcfg.getDomain());
    }

}

Springmodule is rather old an it seems that it is not longer maintained, but it works with Spring 3.0.3.

feel free to copy & paste!