Looks like you haven't included the RestEasy Jackson Provider. Try adding a dependency on org.jboss.resteasy:resteasy-jackson-provider ----- Original Message ----- > From: "Alexander Chriztopher" <alexander.chriztopher(a)gmail.com&gt; > To: keycloak-user(a)lists.jboss.org > Sent: Tuesday, 25 November, 2014 2:30:01 PM > Subject: [keycloak-user] Unable to find a MessageBodyReader of content-type application/json and type > AccessTokenResponse > > Hi All, > > Am trying to execute this call : > > Keycloak keycloak = Keycloak.getInstance(" http://localhost:9080/auth ", > "master", "admin", "admin", "security-admin-console"); > > But am getting the following error : > > Exception in thread "main" javax.ws.rs.client.ResponseProcessingException: > javax.ws.rs.ProcessingException: Unable to find a MessageBodyReader of > content-type application/json and type class > org.keycloak.representations.AccessTokenResponse > at > org.jboss.resteasy.client.jaxrs.internal.ClientInvocation.extractResult(ClientInvocation.java:140) > at > org.jboss.resteasy.client.jaxrs.internal.proxy.extractors.BodyEntityExtractor.extractEntity(BodyEntityExtractor.java:58) > at > org.jboss.resteasy.client.jaxrs.internal.proxy.ClientInvoker.invoke(ClientInvoker.java:104) > at > org.jboss.resteasy.client.jaxrs.internal.proxy.ClientProxy.invoke(ClientProxy.java:62) > at com.sun.proxy.$Proxy19.grantToken(Unknown Source) > at > org.keycloak.admin.client.token.TokenManager.grantToken(TokenManager.java:56) > at > org.keycloak.admin.client.token.TokenManager.getAccessToken(TokenManager.java:33) > at > org.keycloak.admin.client.token.TokenManager.getAccessTokenString(TokenManager.java:28) > at org.keycloak.admin.client.Keycloak.<init>(Keycloak.java:28) > at org.keycloak.admin.client.Keycloak.getInstance(Keycloak.java:32) > at fr.klee.test.RestTest.main(RestTest.java:22) > Caused by: javax.ws.rs.ProcessingException: Unable to find a > MessageBodyReader of content-type application/json and type class > org.keycloak.representations.AccessTokenResponse > at > org.jboss.resteasy.core.interception.ClientReaderInterceptorContext.throwReaderNotFound(ClientReaderInterceptorContext.java:39) > at > org.jboss.resteasy.core.interception.AbstractReaderInterceptorContext.getReader(AbstractReaderInterceptorContext.java:73) > at > org.jboss.resteasy.core.interception.AbstractReaderInterceptorContext.proceed(AbstractReaderInterceptorContext.java:50) > at > org.jboss.resteasy.plugins.interceptors.encoding.GZIPDecodingInterceptor.aroundReadFrom(GZIPDecodingInterceptor.java:59) > at > org.jboss.resteasy.core.interception.AbstractReaderInterceptorContext.proceed(AbstractReaderInterceptorContext.java:53) > at > org.jboss.resteasy.client.jaxrs.internal.ClientResponse.readFrom(ClientResponse.java:248) > at > org.jboss.resteasy.client.jaxrs.internal.ClientResponse.readEntity(ClientResponse.java:181) > at > org.jboss.resteasy.specimpl.BuiltResponse.readEntity(BuiltResponse.java:211) > at > org.jboss.resteasy.client.jaxrs.internal.ClientInvocation.extractResult(ClientInvocation.java:104) > ... 10 more > > What can cause this error ? > > Am running this in the admin-client example (the master one) application by > the way in order to have the right dependencies etc. > > Thanks for any help. > > _______________________________________________ > keycloak-user mailing list > keycloak-user(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/keycloak-user