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JBoss 7 AS RESTEasy issue with generic type arguments
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created by <a href="http://community.jboss.org/people/jantimw">Jan Tim</a> in <i>JBoss Tools</i> - <a href="http://community.jboss.org/message/617055#617055">View the full discussion</a>
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<div class="jive-rendered-content"><p>Before I recently migrated from JBoss 6 to 7, I was using JAX-RS for my RESTful services and everything was went fine. Now that I am working with JBoss 7 I noticed that I can use the build in RESTEasy for my purposes. But unfortunately there seems to be an issue with generic types when used in annotated POST or PUT methods.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>To make things clear, I created a small and easy example of what was working for me before but no longer does: </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">@Path(<font color="red">"/g"</font>)
<font color="navy"><b>public</b></font> <font color="navy"><b>abstract</b></font> <font color="navy"><b>class</b></font> GenericResource<T <font color="navy"><b>extends</b></font> Person> <font color="navy">{</font>
    
    @POST
    @Path(<font color="red">"/add"</font>)
    @Consumes(<font color="red">"application/json"</font>)
    @Produces(<font color="red">"application/json"</font>)
    <font color="navy"><b>public</b></font> String doPost(T person) <font color="navy">{</font>          <font color="darkgreen">// The use of a generic type as argument causes an error</font>
        <font color="navy"><b>return</b></font> <font color="red">"success"</font>;
    <font color="navy">}</font>
    
    
    @GET
    @Produces(<font color="red">"application/json"</font>)
    <font color="navy"><b>public</b></font> T doGet() <font color="navy">{</font>
        @SuppressWarnings(<font color="red">"unchecked"</font>)
        T p = (T) <font color="navy"><b>new</b></font> PersonImpl(<font color="red">"TestPerson"</font>); 
 
        <font color="navy"><b>return</b></font> p;
    <font color="navy">}</font>
    
<font color="navy">}</font>
    
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>As you can see, I just build an abstract class with a generic type T and annotated two methods, one with "POST" and one with "GET". This example worked fine with JBoss 6 and JAX-RS, but now I get the following error on sending any request (get or post) through RESTEeasy to this class:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code">Allocate exception for servlet javax.ws.rs.core.Application: java.lang.RuntimeException: Unable to determine value of type parameter T
    at org.jboss.resteasy.util.Types.getActualValueOfTypeVariable(Types.java:319) [resteasy-jaxrs-2.2.1.GA.jar:]
    at org.jboss.resteasy.core.MethodInjectorImpl.<init>(MethodInjectorImpl.java:65) [resteasy-jaxrs-2.2.1.GA.jar:]
    at org.jboss.resteasy.core.InjectorFactoryImpl.createMethodInjector(InjectorFactoryImpl.java:55) [resteasy-jaxrs-2.2.1.GA.jar:]
    at org.jboss.resteasy.core.ResourceMethod.<init>(ResourceMethod.java:71) [resteasy-jaxrs-2.2.1.GA.jar:]
    at org.jboss.resteasy.core.ResourceMethodRegistry.processMethod(ResourceMethodRegistry.java:178) [resteasy-jaxrs-2.2.1.GA.jar:]
    at org.jboss.resteasy.core.ResourceMethodRegistry.addResourceFactory(ResourceMethodRegistry.java:123) [resteasy-jaxrs-2.2.1.GA.jar:]
    at org.jboss.resteasy.core.ResourceMethodRegistry.addResourceFactory(ResourceMethodRegistry.java:106) [resteasy-jaxrs-2.2.1.GA.jar:]
    at org.jboss.resteasy.core.ResourceMethodRegistry.addResourceFactory(ResourceMethodRegistry.java:83) [resteasy-jaxrs-2.2.1.GA.jar:]
    at org.jboss.resteasy.core.ResourceMethodRegistry.addPerRequestResource(ResourceMethodRegistry.java:72) [resteasy-jaxrs-2.2.1.GA.jar:]
    at org.jboss.resteasy.spi.ResteasyDeployment.registration(ResteasyDeployment.java:367) [resteasy-jaxrs-2.2.1.GA.jar:]
    at org.jboss.resteasy.spi.ResteasyDeployment.start(ResteasyDeployment.java:225) [resteasy-jaxrs-2.2.1.GA.jar:]
    at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.init(ServletContainerDispatcher.java:67) [resteasy-jaxrs-2.2.1.GA.jar:]
    at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.init(HttpServletDispatcher.java:36) [resteasy-jaxrs-2.2.1.GA.jar:]
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1202) [jbossweb-7.0.0.CR4.jar:7.0.0.Final]
    at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:952) [jbossweb-7.0.0.CR4.jar:7.0.0.Final]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:188) [jbossweb-7.0.0.CR4.jar:7.0.0.Final]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) [jbossweb-7.0.0.CR4.jar:7.0.0.Final]
    at org.jboss.as.web.NamingValve.invoke(NamingValve.java:57) [jboss-as-web-7.0.0.Final.jar:7.0.0.Final]
    at org.jboss.as.jpa.interceptor.WebNonTxEmCloserValve.invoke(WebNonTxEmCloserValve.java:49) [jboss-as-jpa-7.0.0.Final.jar:7.0.0.Final]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:154) [jbossweb-7.0.0.CR4.jar:7.0.0.Final]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [jbossweb-7.0.0.CR4.jar:7.0.0.Final]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [jbossweb-7.0.0.CR4.jar:7.0.0.Final]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:362) [jbossweb-7.0.0.CR4.jar:7.0.0.Final]
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [jbossweb-7.0.0.CR4.jar:7.0.0.Final]
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:667) [jbossweb-7.0.0.CR4.jar:7.0.0.Final]
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:951) [jbossweb-7.0.0.CR4.jar:7.0.0.Final]
    at java.lang.Thread.run(Thread.java:662) [:1.6.0_26]
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>If I remove the POST-method, at least the GET-request ist working correctly. Although changing the argument to a type that is not generic fixes the error but that is no long term solution for my problem. Am I doing something wrong or is it a bug that is already known?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Best Regards</p></div>
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