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POCompile Time Weaving Null Pointer Exception
 

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    <h1>Edit 7:</h1> <p>The problem seems to be how to get <code>@Configurable</code> working with <code>HttpSessionListener</code>, a workaround is suggested, but I'dd prefer not to to interact with the <code>WebApplicationContext</code> directly:</p> <pre><code> @Configurable(autowire = Autowire.BY_TYPE, preConstruction = true) public class SessionListener implements HttpSessionListener { private static final Logger log; @Autowired private A a; @Override public void sessionCreated(HttpSessionEvent se) { a.doSomething(); // &lt;- Throws NPE log.info("New session was created"); } @Override public void sessionDestroyed(HttpSessionEvent se) { log.info("A session was closed"); } } </code></pre> <h1>Edit 6:</h1> <p>I made the sample project simpler: you can now run it from CLI</p> <ol> <li>download and extract project: <a href="http://www.2shared.com/file/KpS5xeqf/dynatable.html" rel="nofollow">http://www.2shared.com/file/KpS5xeqf/dynatable.html</a></li> <li>run mvn clean aspectj:compile</li> <li>run mvn gwt:run</li> <li>You should see in your CLI that "Why is consumer NULL here?" is printed. </li> <li>Expected instead is:cunsumer is not NULL!</li> </ol> <p>The end is near :D</p> <h1>Edit 5: Sample project in GWT: pls run this in GWT development mode</h1> <p><a href="http://www.2shared.com/file/eai0PV-5/dynatable.html" rel="nofollow">http://www.2shared.com/file/eai0PV-5/dynatable.html</a></p> <p>You will get a NPE at sessionCreated()</p> <p>Requirements to run are maven + gwt 2.5</p> <h1>Edit 4:</h1> <p>It seemed the sample project wasn't a very representative one. I should reformulate the problem:</p> <p>In eclipse I use GWT Development mode when I run the project as a web application. In some way this doesn't call the aspectj compiler. At least that's the only reason I can think of.</p> <p><strong>Question: How to setup Compile Time Weaving to work with running as web application (GWT Development mode).?</strong></p> <h1>Edit 3:</h1> <p>I made a small sample project in <strong>Eclipse 4.2.1, M2e 1.4.0, STS 3.1.0, AJDT 2.2.2</strong> that demonstrates the problem: <strong><a href="http://www.2shared.com/file/WZ1T9l9-/autowired.html" rel="nofollow">http://www.2shared.com/file/WZ1T9l9-/autowired.html</a></strong></p> <h1>Edit 2:</h1> <p>As suggested by other similar topics I took the plugins of a standard generated <code>Roo</code> project to avoid conflicting versions. No success yet. (Updated the org.codehaus.mojo above)</p> <h1>Edit 1:</h1> <p>I'm not sure this is normal, but when I start up the web application, I get a long log of what spring is doing , <strong>but nothing mentions any weaving / anything related to Aspectj</strong>...</p> <p>I think the problem is related to this plugin in pom.xml not being compiled as <strong>I don't get any feedback in my console</strong>(I tried many other similar plugins but none work) It seems the plugin is never called when I run the web application:</p> <pre><code>&lt;plugin&gt; &lt;groupId&gt;org.codehaus.mojo&lt;/groupId&gt; &lt;artifactId&gt;aspectj-maven-plugin&lt;/artifactId&gt; &lt;version&gt;1.2&lt;/version&gt; &lt;!-- NB: do not use 1.3 or 1.3.x due to MASPECTJ-90 and do not use 1.4 due to declare parents issue --&gt; &lt;dependencies&gt; &lt;!-- NB: You must use Maven 2.0.9 or above or these are ignored (see MNG-2972) --&gt; &lt;dependency&gt; &lt;groupId&gt;org.aspectj&lt;/groupId&gt; &lt;artifactId&gt;aspectjrt&lt;/artifactId&gt; &lt;version&gt;1.7.0&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.aspectj&lt;/groupId&gt; &lt;artifactId&gt;aspectjtools&lt;/artifactId&gt; &lt;version&gt;1.7.0&lt;/version&gt; &lt;/dependency&gt; &lt;/dependencies&gt; &lt;executions&gt; &lt;execution&gt; &lt;goals&gt; &lt;goal&gt;compile&lt;/goal&gt; &lt;goal&gt;test-compile&lt;/goal&gt; &lt;/goals&gt; &lt;/execution&gt; &lt;/executions&gt; &lt;configuration&gt; &lt;outxml&gt;true&lt;/outxml&gt; &lt;aspectLibraries&gt; &lt;aspectLibrary&gt; &lt;groupId&gt;org.springframework&lt;/groupId&gt; &lt;artifactId&gt;spring-aspects&lt;/artifactId&gt; &lt;/aspectLibrary&gt; &lt;/aspectLibraries&gt; &lt;source&gt;1.6&lt;/source&gt; &lt;target&gt;1.6&lt;/target&gt; &lt;/configuration&gt; &lt;/plugin&gt; </code></pre> <h1>Original Post:</h1> <p>I've been searching stackoverflow and many other resources, but none of their standard solutions help me to find why an <code>@autowired</code> field yields to <code>Null Pointer Exception (NPE)</code> when accessed.</p> <pre><code>@Configurable(autowire = Autowire.BY_TYPE, preConstruction = true) public class SessionListener implements HttpSessionListener { private static final Logger log; @Autowired private A a; @Override public void sessionCreated(HttpSessionEvent se) { a.doSomething(); // &lt;- Throws NPE log.info("New session was created"); } @Override public void sessionDestroyed(HttpSessionEvent se) { log.info("A session was closed"); } } </code></pre> <p>The A class is declared as follows:</p> <pre><code>@Service public class B implements A { // some implementation } </code></pre> <p>my application context has the relevant parts:</p> <pre><code>&lt;context:spring-configured /&gt; &lt;context:annotation-config /&gt; &lt;context:component-scan base-package='some.package' /&gt; </code></pre> <p>All necessary libraries are there. I use Spring 3.0.2. Due to my environment, I'm only able to use compile time weaving. I'm also using the Google Plugin to start GWT Development Mode. I'm using <code>ADJT</code>, the <code>Spring Tool Suite</code>, <code>m2Eclipse</code> and <code>Google Plugin</code>. I also installed AJDT configurator for m2e v1.0.</p>
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    1. COI've added the ADJT plugin to my project, but still same results. Can anyone guide me to a way to debug this?
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    2. COCould you share the code that creates your A class?
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    3. COI don't think the problem lies there, as there are several @autowired in the SessionListener, I just abstracted one to make the code more brief. In any case I added one example to the original post. And thanks for the reply!
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