Using MessageSource to get properties (i18N)

For International Support we need to implement properties files for each language. In order to support this, Spring provides a ResourceBundleMessageSource which we define in the spring-config.xml. With this in place, we can supply Spring with a list of properties files and a locale to use.  We can now use this combination to provide messages … Continue reading Using MessageSource to get properties (i18N)

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annotated Java Bean to read config.properties

This example is a little contrived in order to keep it simple. So far we have only covered Spring beans that are defined using the spring-config.xml. In this example we will use annotations in the bean class declaration to identify it as a Spring bean and then tell Spring where to look for these beans. … Continue reading annotated Java Bean to read config.properties

Spring , @Resource, @PostConstruct and @PreDestroy

Spring supports JSR-250 which provides @Resource, @PostConstruct and @PreDestroy annotations. @Resource The @Resource annotation is used in the bean class and is attached to the setter methods of the properties.  It is used to inject a specific bean resource. - will look for a bean with the same name as the property XXX - will … Continue reading Spring , @Resource, @PostConstruct and @PreDestroy

Spring context:annotation-config

In our previous examples we have to define a bean for each BeanPostProcessor we wanted to use. Spring provides a shortcut to do this in the context namespace. We simply need to add the context namespace to our declared namespaces at the top of our config xml file and add the context:annotation-config to our bean … Continue reading Spring context:annotation-config

@Autowired and @Qualifier Annotations for Spring

We use @Autowired to automatically wire our bean dependencies. Example In the following example, we have autowired the home address for our student from the previous example. Spring will look for a single bean with a type that matches the type for home. If it finds this bean then it will automatically inject that bean … Continue reading @Autowired and @Qualifier Annotations for Spring

@Required Spring Annotation

@Required We use the @Required annotation to tell Spring that a property on a bean is required. Student.java Here we have applied the @Required annotation to the method setStudentId. student1.xml This will do nothing if we do not add the RequiredAnnotationBeanPostProcessor bean to our Spring config xml file. TestStudent1.java Now we can bring it all … Continue reading @Required Spring Annotation

Using a Bean PostProcessor for Spring Annotations

I will cover the easy way to do this in a later post, but in this post we will look at how Spring processes annotations. Available JSR-250 Spring Annotations The spring-beans-3.x.jar contains the package org.springframework.beans.factory.annotation. In this package you will find the following BeanPostProcessors: AutowiredAnnotationBeanPostProcessor InitDestroyAnnotationBeanPostProcessor QualifierAnnotationBeanPostProcessor RequiredAnnotationBeanPostProcesor These PostProcessors facilitate the following annotations which … Continue reading Using a Bean PostProcessor for Spring Annotations