Autowiring is not working when configured through XML - spring

Question

class ConfigurationDetails {
private #Resource String esHostURL;
private #Resource int maxMessageCounter;
private #Resource String queueName;
// Assume : This class has all getter and setter methods and a default constructor
}
Another Class
public class SpringMessageListener implements MessageListener {
#Resource ConfigurationDetails configDetails; // With getter and setter method for this
............
..........
And in my XML
<bean id="aListener" class="com.vzw.es.cosumer.SpringMessageListener" autowire="byName"/>
<bean id="configDetails" class="com.vzw.es.pojo.ConfigurationDetails" autowire="byName">
<property name="esHostURL" value="http://obsgracstg-db0.odc.vzwcorp.com:9200"/>
<property name="maxMessageCounter" value="500"/>
<property name="queueName" value="ES_queue"/>
</bean>
Now the bean with id configDetails is not getting autowired meaning when I debug the code and see the configDetails in class SpringMessageListerner it is showing null. But when I explicitly do the appContext.getBean("configDetails") it gives me the not null Object.
Why is the Autowiring is not working? Am I missing anything?

Answer 1

Spring doesn't, by default, look for #Autowired, #Resource, or #Inject annotations to autowire your beans. You need to tell it to look for them with
<context:component-scan base-package="com.yourpackage.some" />
// or, in this case, <context:annotation-config />
with this, Spring will scan the classes in the package and inject beans for which an #Autowired or #Resource exists.
Don't forget to add the namespace declarations
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd">
More importantly
class ConfigurationDetails {
private #Resource String esHostURL;
private #Resource int maxMessageCounter;
private #Resource String queueName;
// Assume : This class has all getter and setter methods and a default constructor
}
Although you can autowire String and int types, this is usually considered bad practice. Instead remove the #Resource annotation here and add getters and setters for each of the fields.
The property element in the <bean> declaration takes care of setting those fields.