Injection of Properties fails

[peter0601]

Hi folks,

i have the following problem:

I define a bean in my applicationContext:

<bean id="applicationProperties" class="org.springframework.beans.factory.config.PropertiesFactoryBean">
        <property name="locations">
            <list>
                <value>file:/etc/acodyn/collector.properties</value>
            </list>
        </property>
    </bean>

In a junit test the loading of the applicationContext works well until another bean will be initialized through the context:

<bean id="collectorBean" name="collectorBean" class="de.test.collectorBean" depends-on="applicationProperties" />

In my understanding if I use the following code, the collectorBean should wait until the applicationProperties are initilized and ready for injection.

public class CallCollectorProviderObserverBean implements ProviderObserver{
    
    final Logger logger = LoggerFactory.getLogger(CallCollectorProviderObserverBean.class);
    Condition conditionInService = new Condition();
    
    @Autowired
    private Properties applicationProperties;

    public collectorBean() {
        
        initialize();
        
    }
    
    private void initialize(){
        
        String host = applicationProperties.getProperty("host");
        String user = applicationProperties.getProperty("user");

    }
}

But when I start loading the applicationContext, I get a NullPointerException because applicationProperties is NULL.

Any suggestions what can be wrong?

Cheers and thanks in advance
Peter

[Marten Deinum]

But when I start loading the applicationContext, I get a NullPointerException because applicationProperties is NULL.

Which isn't that strange it is what I expected to happen...

You expect a dependency to be injected BEFORE an instance of your class exists.. Not sure how you have that in mind but I can assure you that is NEVER going to happen. Remove the call to initialize from your constructor and simple put @PostContruct on your initialize method.

[peter0601]

Aaahhh... here we go...

thanks mate for the hint.

I thought with adding the depends-on attribute the container will wait for processing the constructor until the applicationProperties are completely initialized.

Well everyday is a good day to learn something new.

Again many thanks...

Cheers