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POWeld Servlet not working when downgrading from JBoss AS 7 to JBoss AS 5
 

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  1. POWeld Servlet not working when downgrading from JBoss AS 7 to JBoss AS 5
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    <p>I have an app that runs fine on jboss7, it uses jee6 apis: jax-rs and CDI. Due to production limitations I was asked to adapt it to run on Jboss 5.1.0. To make things easy I created a minimal application, with only one service and one injection. It works fine on jb7, and I had to add the libs that are not provided for the jboss5 version. </p> <p>jax-rs worked fine, I added RestEasy and declared the RestEasy servlet on the web.xml.</p> <p>For CDI I included Weld, to work on servlet mode, since the application does not have servlets. Following the docs, I included the listener on the web.xml, and then found on a jboss forum that another listener is necessary to register the BeanContext to the jboss jndi. </p> <p>So what I have is:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"&gt; &lt;listener&gt; &lt;listener-class&gt;org.jboss.weld.environment.servlet.Listener&lt;/listener-class&gt; &lt;/listener&gt; &lt;listener&gt; &lt;listener-class&gt;org.jboss.weld.environment.servlet.BeanManagerResourceBindingListener&lt;/listener-class&gt; &lt;/listener&gt; &lt;servlet&gt; &lt;servlet-name&gt;resteasy-servlet&lt;/servlet-name&gt; &lt;servlet-class&gt;org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher&lt;/servlet-class&gt; &lt;init-param&gt; &lt;param-name&gt;javax.ws.rs.Application&lt;/param-name&gt; &lt;param-value&gt;br.com.bvmf.services.ApplicationConfig&lt;/param-value&gt; &lt;/init-param&gt; &lt;/servlet&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;resteasy-servlet&lt;/servlet-name&gt; &lt;url-pattern&gt;/*&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; &lt;session-config&gt; &lt;session-timeout&gt; 30 &lt;/session-timeout&gt; &lt;/session-config&gt; &lt;/web-app&gt; </code></pre> <p>For the build I am using Gadle, but just to have a better understanding for not I am inserting most of the jars manually for now:</p> <pre><code>apply plugin: 'java' apply plugin: 'eclipse' apply plugin: 'war' webAppDirName = 'WebContent' repositories { mavenCentral() flatDir name:'EasyRestJars',dirs:'libs' } dependencies { compile( [name : 'weld-servlet', version : '2.0.0.SP1-jboss5'], [name : 'jaxrs-api', version : '2.3.6.Final'], [name : 'jackson-core-asl', version : '1.9.9'], [name : 'jackson-jaxrs', version : '1.9.9'], [name : 'jackson-mapper-asl', version : '1.9.9'], [name : 'resteasy-jackson-provider', version : '2.3.6.Final'], [name : 'resteasy-jaxb-provider', version : '2.3.6.Final'], [name : 'resteasy-jaxrs', version : '2.3.6.Final'], [name : 'scannotation', version : '1.0.3'] ) providedCompile( [group: 'org.slf4j', name: 'slf4j-api', version: '1.5.6'], [group: 'javaee', name: 'javaee-api', version: '5' ] ) testCompile group: 'junit', name: 'junit', version: '4.+' } test { systemProperties 'property': 'value' } war{ exclude 'WEB-INF/lib/*' } </code></pre> <p>Now the three classes:</p> <p>Tha application config just returns the service:</p> <pre><code>@ApplicationPath("min") public class ApplicationConfig extends Application { @Override public Set&lt;Class&lt;?&gt;&gt; getClasses() { Set&lt;Class&lt;?&gt;&gt; resources = new java.util.HashSet&lt;Class&lt;?&gt;&gt;(); resources.add(br.com.bvmf.services.HelloWorldResource.class); return resources; } } </code></pre> <p>The bean that should be injected:</p> <pre><code>public class HelloProvider { public String getString() { return "Injected Hello"; } } </code></pre> <p>And the service itself:</p> <pre><code>@Path("/helloworld") public class HelloWorldResource { @Inject private HelloProvider provider; @GET public String getMessage() { //This is where I get a null pointer return provider.getString(); } } </code></pre> <p>So the bean is not injected, just that. During the deploy, the log reads:</p> <pre><code>2013-06-04 15:24:31,371 INFO [org.jboss.webbeans.bootstrap.WebBeansBootstrap] (HDScanner) Web Beans 1.0.0.PREVIEW1 2013-06-04 15:24:32,898 INFO [org.jboss.web.tomcat.service.deployers.TomcatDeployment] (HDScanner) deploy, ctxPath=/min-cil-1.0-SNAPSHOT 2013-06-04 15:24:33,417 INFO [org.jboss.weld.Version] (HDScanner) WELD-000900 2.0.0 (SP1) 2013-06-04 15:24:33,774 INFO [org.jboss.weld.Bootstrap] (HDScanner) WELD-000101 Transactional services not available. Injection of @Inject UserTransaction not available. Transactional observers will be invoked synchronously. 2013-06-04 15:24:34,485 WARN [org.jboss.weld.Bootstrap] (HDScanner) Legacy deployment metadata provided by the integrator. Certain functionality will not be available. 2013-06-04 15:24:34,809 INFO [org.jboss.weld.environment.tomcat.Tomcat6Container] (HDScanner) Tomcat 6 detected, CDI injection will be available in Servlets and Filters. Injection into Listeners is not supported 2013-06-04 15:24:35,750 INFO [org.jboss.weld.environment.servlet.BeanManagerResourceBindingListener] (HDScanner) BeanManager reference bound to java:comp/env/BeanManager 2013-06-04 15:26:13,648 INFO [org.jboss.resteasy.spi.ResteasyDeployment] (http-127.0.0.1-8080-2) Deploying javax.ws.rs.core.Application: class br.com.bvmf.services.ApplicationConfig </code></pre> <p>There is a note in the <a href="http://docs.jboss.org/weld/reference/latest/en-US/html/environments.html" rel="nofollow">weld docs</a> saying that: "Additionally, Weld Servlet supports JBoss EAP 5.1, to do this use the jboss5 variant of Weld Servlet." So I found this version, but it made no difference (besides more problems with slf4j).</p>
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    2. CONo, it seems Weld is not supported on JBoss 5.1 afterall. In the end I changed the dependency injection to Spring with annotations and autowire. Spring played well with RESTEasy, so its all fine now.
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