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POWhy does Spring's @Configurable sometimes work and sometimes not?
 

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  1. POWhy does Spring's @Configurable sometimes work and sometimes not?
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    <p>I'm trying to use automatic dependency injection via Spring's @Configurable annotation w/ @Resource on the fields needing injection. This involved some setup, like passing spring-agent.jar to my JVM. For the full details <a href="http://static.springframework.org/spring/docs/2.5.x/reference/aop.html" rel="noreferrer">see here</a>.</p> <p>It works... mostly. When my Tomcat is booting up, I see the AspectJ init messages, my User objects automatically get FileService references, etc.</p> <p>The problem is that sometimes it just doesn't happen. It appears to be completely random; sometimes I boot up and the dependencies are not injected, sometimes they are. I previously had trouble with @Transactional being on my User because it created a conflict, I believe with proxies. I am using JPA, so my User is marked with @Entity, so my best guess right now is that this is creating a conflict. I've read you can't auto proxy a proxy. To offset the conflict, I followed some notes I found online about excluding <strong>CGLIB</strong> and <strong>javassist</strong> which Hibernate (my JPA impl) uses.</p> <p>Clues: </p> <ul> <li>It's all or nothing. All of my @Configurable instances have been injected or none of them.</li> <li>Reloading (reinstantiating) the Entity from the DB doesn't appear to help; it's either working or not.</li> <li>Rebooting Tomcat any number of time also won't even fix it. The only thing that appears to roll the dice again is a redeploy. In other words, if I redeploy it may work.</li> </ul> <p>How can I figure out what is going wrong? Is anyone using @Configurable with JPA? Why isn't my <em>dependencyCheck = true</em> throwing an error when dependencies are not actually injected?</p> <p><strong>Entity</strong></p> <pre><code>@Entity @Configurable(dependencyCheck = true) @NamedQueries( { @NamedQuery(name = "User.findAll", query = "SELECT user FROM User user"), @NamedQuery(name = "User.findByEmail", query = "SELECT user FROM User user WHERE user.email = :email") }) public abstract class User extends BaseModel { private static final long serialVersionUID = 7881431079061750040L; @Id @GeneratedValue(strategy = GenerationType.TABLE) private Long id; @Column(unique = true, nullable = false) private String email; @Basic(optional = false) private String password; @Resource private transient UserEmailer userEmailer; @Resource private transient FileService fileService; ... </code></pre> <p><strong>aop.xml</strong></p> <pre><code>&lt;!DOCTYPE aspectj PUBLIC "-//AspectJ//DTD//EN" "http://www.eclipse.org/aspectj/dtd/aspectj.dtd"&gt; &lt;aspectj&gt; &lt;weaver options="-verbose"&gt; &lt;include within="com.myapp.domain..*" /&gt; &lt;exclude within="*..*CGLIB*" /&gt; &lt;exclude within="*..*javassist*" /&gt; &lt;/weaver&gt; &lt;aspects&gt; &lt;aspect name="org.springframework.beans.factory.aspectj.AbstractInterfaceDrivenDependencyInjectionAspect" /&gt; &lt;/aspects&gt; &lt;/aspectj&gt; </code></pre> <p><strong>applicationContext.xml</strong></p> <pre><code>... &lt;context:spring-configured /&gt; &lt;context:load-time-weaver /&gt; &lt;context:component-scan base-package="com.myapp" /&gt; ... </code></pre>
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    1. COI too have been experiencing these type of issues with @Configurable and @Transactional for a long while. I think it has to do with the class loader loading the classes before the spring context is initialized. See this thread: http://forum.springsource.org/showthread.php?t=68406. The sporadic nature of this bug is extremely annoying.
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    2. COGiven all of the changes to Spring, is there now a better solution to this problem?
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