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Struggling with injecting singleton in 6.0
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created by <a href="http://community.jboss.org/people/rhinmass">Robin Hughes</a> in <i>Beginner's Corner</i> - <a href="http://community.jboss.org/message/597183#597183">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hello,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I am having trouble figuring out how to inject a singleton into another class - in this case a servlet.  </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>My singleton looks like this:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>package com.robin.ejb</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import javax.ejb.Singleton;</p><p>import javax.ejb.Startup;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>@Singleton</p><p>@Startup </p><p>public class HelloWorld</p><p>{</p><p>    public HelloWorld()</p><p>    {</p><p>        System.out.println("constructing HelloWorld");</p><p>    }   </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public String sayHello() {</p><p>        return "Hello World !!!";</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>My servlet looks like this:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import ...</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import com.robin.ejb.HelloWorld;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>@WebServlet(name="helloServlet", urlPatterns={"/hello"}, </p><p>        initParams={ @WebInitParam(name="nameParam", value="world")})</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>public class HelloServlet extends HttpServlet {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    private static final long serialVersionUID = 1L;</p><p>    @Inject</p><p>    private HelloWorld hw;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    @Override</p><p>    protected void doGet(HttpServletRequest request, HttpServletResponse response)</p><p>            throws ServletException, IOException {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        PrintWriter out = response.getWriter();</p><p>        String nameParam = request.getParameter("nameParam");</p><p>        if (nameParam == null)</p><p>            nameParam = getServletConfig().getInitParameter("nameParam");</p><p>        out.println("hello " + nameParam + " " + hw.sayHello());</p><p>        out.flush();</p><p>        out.close();</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>When I run this in JBoss AS 6.0.0.Final I get the following errors:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>2011-04-01 10:23:43,299 ERROR [org.jboss.kernel.plugins.dependency.AbstractKernelController] (Thread-2) Error installing to Start: name=vfs:///C:/jboss/jboss-6.0.0.Final/server/rbh/deploy/myapp-0.0.1.ear_WeldBootstrapBean state=Create: org.jboss.weld.exceptions.DeploymentException: WELD-001409 Ambiguous dependencies for type [HelloWorld] with qualifiers [@Default] at injection point [[field] @Inject private com.robin.webapp.HelloServlet.hw]. Possible dependencies [[Session bean [class com.robin.ejb.HelloWorld with qualifiers [@Any @Default]; local interfaces are [HelloWorld], Session bean [class com.robin.ejb.HelloWorld with qualifiers [@Any @Default]; local interfaces are [HelloWorld]]]</p><p>    at org.jboss.weld.bootstrap.Validator.validateInjectionPoint(Validator.java:309) [:6.0.0.Final]</p><p>    at org.jboss.weld.bootstrap.Validator.validateBean(Validator.java:139) [:6.0.0.Final]</p><p>    at org.jboss.weld.bootstrap.Validator.validateRIBean(Validator.java:162) [:6.0.0.Final]</p><p>    at org.jboss.weld.bootstrap.Validator.validateBeans(Validator.java:377) [:6.0.0.Final]</p><p>    at org.jboss.weld.bootstrap.Validator.validateDeployment(Validator.java:363) [:6.0.0.Final]</p><p>    at org.jboss.weld.bootstrap.WeldBootstrap.validateBeans(WeldBootstrap.java:388) [:6.0.0.Final]</p></div>
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