9:27 a.m.
Jan Tim [http://community.jboss.org/people/jantimw] created the discussion
"JBoss 7 AS RESTEasy issue with generic type arguments"
To view the discussion, visit: http://community.jboss.org/message/617055#617055
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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.
To make things clear, I created a small and easy example of what was working for me before
but no longer does:
@Path("/g")
public abstract class GenericResource<T extends Person> {
@POST
@Path("/add")
@Consumes("application/json")
@Produces("application/json")
public String doPost(T person) { // The use of a generic type as argument
causes an error
return "success";
}
@GET
@Produces("application/json")
public T doGet() {
@SuppressWarnings("unchecked")
T p = (T) new PersonImpl("TestPerson");
return 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:
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]
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?
Best Regards
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