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    <p>My first effort was poor, but I was in hurry. I apologize. Now I think I know how it should work, because I believe I've implemented what you want myself. </p> <p>I started with a Credential class (note: no interface): </p> <pre><code> package aop; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class Credential { private static final String DEFAULT_USERNAME = "username"; private static final String DEFAULT_PASSWORD = "password"; private String username; private String password; public static void main(String[] args) { Credential cred1 = new Credential("foo", "bar"); System.out.println("created using new: " + cred1); ApplicationContext context = new ClassPathXmlApplicationContext("classpath:aop-context.xml"); Credential cred2 = (Credential) context.getBean("credential"); System.out.println("created using app context: " + cred2); String password = ((args.length > 0) ? args[0] : "baz"); cred2.setPassword(password); System.out.println("initialized using setter: " + cred2); } public Credential() { this(DEFAULT_USERNAME, DEFAULT_PASSWORD); } public Credential(String username, String password) { this.setUsername(username); this.setPassword(password); } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String toString() { return new StringBuilder().append("Credential{").append("username='").append(username).append('\'').append(", password='").append(password).append('\'').append('}').toString(); } } </code></pre> <p>I created a Decryptor interface: </p> <pre><code> package aop; public interface Decryptor { String decrypt(String encrypted); } </code></pre> <p>And a DecryptorImpl: </p> <pre><code> package aop; public class DecryptorImpl implements Decryptor { public static final String DEFAULT_DECRYPTED_VALUE = " - not secret anymore"; public String decrypt(String encrypted) { // Any transform will do; this suffices to demonstrate return encrypted + DEFAULT_DECRYPTED_VALUE; } } </code></pre> <p><br/></p> <p> I needed DecryptorAdvice to implement Spring's MethodBeforeAdvice: </p> <p><br/></p> <pre><code> package aop; import org.springframework.aop.MethodBeforeAdvice; import java.lang.reflect.Method; public class DecryptionAdvice implements MethodBeforeAdvice { private Decryptor decryptor; public DecryptionAdvice(Decryptor decryptor) { this.decryptor = decryptor; } public void before(Method method, Object[] args, Object target) throws Throwable { String encryptedPassword = (String) args[0]; args[0] = this.decryptor.decrypt(encryptedPassword); } } </code></pre> <p>And I wired it together in an aop-context.xml. (If you tell me how to get XML to display, I'll post it.) Note the passwordDecryptionAdvisor: it only matches the setPassword method.</p> <p>The interesting part happens when I run it. Here's what I see in the console: </p> <pre><code> created using new: Credential{username='foo', password='bar'} created using app context: Credential{username='stackoverflow', password='encrypted-password'} initialized using setter: Credential{username='stackoverflow', password='baz - not secret anymore'} </code></pre> <p>What this tells me is:</p> <ol> <li>If I create an object with new it's not under Spring's control, advice isn't applied.</li> <li>If I call setPassword in the ctor before the app context is initialized, advice isn't applied.</li> <li>If I call setPassword in my code after the app context is initialized, advice is applied.</li> </ol> <p>I hope this can help you.</p>
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    1. COThat's exactly what I see, but it begs the question: How can advice be applied when properties are set in the application context?
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    2. COcan't be done until app context is initialized.
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    3. COIf that's true, then it is truly teh suck.
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