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PODependency injection with Jersey 2.0
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  1. PODependency injection with Jersey 2.0
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    copied!<p>Starting from scratch without any previous Jersey 1.x knowledge, I'm having a hard time understanding how to setup dependency injection in my Jersey 2.0 project. </p> <p>I also understand that HK2 is available in Jersey 2.0, but I cannot seem to find docs that help with Jersey 2.0 integration.</p> <pre class="lang-java prettyprint-override"><code>@ManagedBean @Path("myresource") public class MyResource { @Inject MyService myService; /** * Method handling HTTP GET requests. The returned object will be sent * to the client as "text/plain" media type. * * @return String that will be returned as a text/plain response. */ @GET @Produces(MediaType.APPLICATION_JSON) @Path("/getit") public String getIt() { return "Got it {" + myService + "}"; } } @Resource @ManagedBean public class MyService { void serviceCall() { System.out.print("Service calls"); } } </code></pre> <p>pom.xml</p> <pre class="lang-xml prettyprint-override"><code>&lt;properties&gt; &lt;jersey.version&gt;2.0-rc1&lt;/jersey.version&gt; &lt;project.build.sourceEncoding&gt;UTF-8&lt;/project.build.sourceEncoding&gt; &lt;/properties&gt; &lt;dependencyManagement&gt; &lt;dependencies&gt; &lt;dependency&gt; &lt;groupId&gt;org.glassfish.jersey&lt;/groupId&gt; &lt;artifactId&gt;jersey-bom&lt;/artifactId&gt; &lt;version&gt;${jersey.version}&lt;/version&gt; &lt;type&gt;pom&lt;/type&gt; &lt;scope&gt;import&lt;/scope&gt; &lt;/dependency&gt; &lt;/dependencies&gt; &lt;/dependencyManagement&gt; &lt;dependencies&gt; &lt;dependency&gt; &lt;groupId&gt;org.glassfish.jersey.core&lt;/groupId&gt; &lt;artifactId&gt;jersey-common&lt;/artifactId&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.glassfish.jersey.core&lt;/groupId&gt; &lt;artifactId&gt;jersey-server&lt;/artifactId&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.glassfish.jersey&lt;/groupId&gt; &lt;artifactId&gt;jax-rs-ri&lt;/artifactId&gt; &lt;/dependency&gt; &lt;/dependencies&gt; </code></pre> <p>I can get the container to start and serve up my resource, but as soon as I add @Inject to MyService, the framework throws an exception:</p> <pre><code>SEVERE: Servlet.service() for servlet [com.noip.MyApplication] in context with path [/jaxrs] threw exception [A MultiException has 3 exceptions. They are: 1. org.glassfish.hk2.api.UnsatisfiedDependencyException: There was no object available for injection at Injectee(requiredType=MyService,parent=MyResource,qualifiers={}),position=-1,optional=false,self=false,unqualified=null,1039471128) 2. java.lang.IllegalArgumentException: While attempting to resolve the dependencies of com.noip.MyResource errors were found 3. java.lang.IllegalStateException: Unable to perform operation: resolve on com.noip.MyResource ] with root cause org.glassfish.hk2.api.UnsatisfiedDependencyException: There was no object available for injection at Injectee(requiredType=MyService,parent=MyResource,qualifiers={}),position=-1,optional=false,self=false,unqualified=null,1039471128) at org.jvnet.hk2.internal.ThreeThirtyResolver.resolve(ThreeThirtyResolver.java:74) </code></pre> <p><br> My starter project is available at GitHub: <a href="https://github.com/donaldjarmstrong/jaxrs" rel="noreferrer">https://github.com/donaldjarmstrong/jaxrs</a></p>
 

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