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    <p>Before we get Spring 3 - which allows you to inject property constants directly into your beans using annotations - I wrote a sub-class of the PropertyPlaceholderConfigurer bean that does the same thing. So, you can mark up your property setters and Spring will autowire your properties into your beans like so:</p> <pre><code>@Property(key="property.key", defaultValue="default") public void setProperty(String property) { this.property = property; } </code></pre> <p>The Annotation is as follows:</p> <pre><code>@Retention(RetentionPolicy.RUNTIME) @Target({ElementType.METHOD, ElementType.FIELD}) public @interface Property { String key(); String defaultValue() default ""; } </code></pre> <p>The PropertyAnnotationAndPlaceholderConfigurer is as follows:</p> <pre><code>public class PropertyAnnotationAndPlaceholderConfigurer extends PropertyPlaceholderConfigurer { private static Logger log = Logger.getLogger(PropertyAnnotationAndPlaceholderConfigurer.class); @Override protected void processProperties(ConfigurableListableBeanFactory beanFactory, Properties properties) throws BeansException { super.processProperties(beanFactory, properties); for (String name : beanFactory.getBeanDefinitionNames()) { MutablePropertyValues mpv = beanFactory.getBeanDefinition(name).getPropertyValues(); Class clazz = beanFactory.getType(name); if(log.isDebugEnabled()) log.debug("Configuring properties for bean="+name+"["+clazz+"]"); if(clazz != null) { for (PropertyDescriptor property : BeanUtils.getPropertyDescriptors(clazz)) { Method setter = property.getWriteMethod(); Method getter = property.getReadMethod(); Property annotation = null; if(setter != null &amp;&amp; setter.isAnnotationPresent(Property.class)) { annotation = setter.getAnnotation(Property.class); } else if(setter != null &amp;&amp; getter != null &amp;&amp; getter.isAnnotationPresent(Property.class)) { annotation = getter.getAnnotation(Property.class); } if(annotation != null) { String value = resolvePlaceholder(annotation.key(), properties, SYSTEM_PROPERTIES_MODE_FALLBACK); if(StringUtils.isEmpty(value)) { value = annotation.defaultValue(); } if(StringUtils.isEmpty(value)) { throw new BeanConfigurationException("No such property=["+annotation.key()+"] found in properties."); } if(log.isDebugEnabled()) log.debug("setting property=["+clazz.getName()+"."+property.getName()+"] value=["+annotation.key()+"="+value+"]"); mpv.addPropertyValue(property.getName(), value); } } for(Field field : clazz.getDeclaredFields()) { if(log.isDebugEnabled()) log.debug("examining field=["+clazz.getName()+"."+field.getName()+"]"); if(field.isAnnotationPresent(Property.class)) { Property annotation = field.getAnnotation(Property.class); PropertyDescriptor property = BeanUtils.getPropertyDescriptor(clazz, field.getName()); if(property.getWriteMethod() == null) { throw new BeanConfigurationException("setter for property=["+clazz.getName()+"."+field.getName()+"] not available."); } Object value = resolvePlaceholder(annotation.key(), properties, SYSTEM_PROPERTIES_MODE_FALLBACK); if(value == null) { value = annotation.defaultValue(); } if(value == null) { throw new BeanConfigurationException("No such property=["+annotation.key()+"] found in properties."); } if(log.isDebugEnabled()) log.debug("setting property=["+clazz.getName()+"."+field.getName()+"] value=["+annotation.key()+"="+value+"]"); mpv.addPropertyValue(property.getName(), value); } } } } } } </code></pre> <p>Feel free to modify to taste</p>
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    1. POHow can I inject a property value into a Spring Bean which was configured using annotations?
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    1. USRicardo Gladwell
    1. USRicardo Gladwell
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    1. COPlease note, that I have created a new project for the above: http://code.google.com/p/spring-property-annotations/
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      1. USRicardo Gladwell
 

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