@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 →

@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 →

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: AutowiredAnnotationBeanPostProcessorInitDestroyAnnotationBeanPostProcessorQualifierAnnotationBeanPostProcessorRequiredAnnotationBeanPostProcesor These PostProcessors facilitate the following annotations which can be found... Continue Reading →

Read Spring Bean Values from Property File

This example uses a BeanFactoryPostProcessor called PropertyPlaceholderConfigurer to read spring.xml config values from a property file. Example people2.properties people2.xml note that we use the PropertyPlaceholderConfigurer which is a BeanFactoryPostProcessor provided specifically for working with property configuration. TestPeople2.java

BeanFactoryPostProcessor

The BeanFactoryPostProcessor is useful for custom config files targeted at system administrators that override bean properties configured in the application context. Use this to execute code once the BeanFactory itself has been initialised. Example MyBeanFactoryPostProcessor Create the class MyBeanFactoryPostProcessor that implements BeanFactoryPostProcessoroverride the method postProcessBeanFactoryprint a message in the method Configure the PostProcessor Bean Declare... Continue Reading →

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