如何在Google App Engine上创建RESTful客户端？

Question

I'm trying to create a RESTful web service client on Google App Engine (Java) that consumes Json. I've tried Sitebricks and Jersey, but neither of them seem to work. Is there any framework out there that can be used to create RESTful web service clients on GAE?

Exception for Sitebricks:

Caused by: java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "modifyThreadGroup")
    at java.security.AccessControlContext.checkPermission(AccessControlContext.java:366)
    at java.security.AccessController.checkPermission(AccessController.java:555)
    at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)
    at com.google.appengine.tools.development.DevAppServerFactory$CustomSecurityManager.checkPermission(DevAppServerFactory.java:283)
    at com.google.appengine.tools.development.DevAppServerFactory$CustomSecurityManager.checkAccess(DevAppServerFactory.java:308)
    at java.lang.ThreadGroup.checkAccess(ThreadGroup.java:315)
    at java.lang.Thread.init(Thread.java:376)
    at java.lang.Thread.<init>(Thread.java:525)
    at com.ning.http.client.AsyncHttpClientConfig$Builder$2.newThread(AsyncHttpClientConfig.java:421)
    at java.util.concurrent.ThreadPoolExecutor$Worker.<init>(ThreadPoolExecutor.java:598)
    at java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:913)
    at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1336)
    at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:132)
    at com.ning.http.client.providers.jdk.JDKAsyncHttpProvider.execute(JDKAsyncHttpProvider.java:156)
    at com.ning.http.client.providers.jdk.JDKAsyncHttpProvider.execute(JDKAsyncHttpProvider.java:123)
    at com.ning.http.client.AsyncHttpClient.executeRequest(AsyncHttpClient.java:496)
    at com.google.sitebricks.client.AHCWebClient.simpleRequest(AHCWebClient.java:85)
    at com.google.sitebricks.client.AHCWebClient.get(AHCWebClient.java:133)

And for Jersey:

Caused by: java.security.AccessControlException: access denied ("javax.xml.bind.JAXBPermission" "setDatatypeConverter")
    at java.security.AccessControlContext.checkPermission(AccessControlContext.java:366)
    at java.security.AccessController.checkPermission(AccessController.java:555)
    at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)
    at com.google.appengine.tools.development.DevAppServerFactory$CustomSecurityManager.checkPermission(DevAppServerFactory.java:283)
    at javax.xml.bind.DatatypeConverter.setDatatypeConverter(DatatypeConverter.java:134)
    at com.sun.xml.bind.v2.runtime.JAXBContextImpl$3.run(JAXBContextImpl.java:304)
    at com.sun.xml.bind.v2.runtime.JAXBContextImpl$3.run(JAXBContextImpl.java:303)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.xml.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:302)
    at com.sun.xml.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(JAXBContextImpl.java:1170)
    at com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:145)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:248)
    at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:235)
    at javax.xml.bind.ContextFinder.find(ContextFinder.java:432)
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:637)
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:584)
    at com.sun.jersey.core.provider.jaxb.AbstractJAXBProvider.getStoredJAXBContext(AbstractJAXBProvider.java:194)
    at com.sun.jersey.core.provider.jaxb.AbstractJAXBProvider.getJAXBContext(AbstractJAXBProvider.java:187)
    at com.sun.jersey.core.provider.jaxb.AbstractJAXBProvider.getUnmarshaller(AbstractJAXBProvider.java:139)
    at com.sun.jersey.core.provider.jaxb.AbstractJAXBProvider.getUnmarshaller(AbstractJAXBProvider.java:122)
    at com.sun.jersey.core.provider.jaxb.AbstractRootElementProvider.readFrom(AbstractRootElementProvider.java:111)
    at com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:565)
    at com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:517)
    at com.sun.jersey.api.client.WebResource.handle(WebResource.java:684)
    at com.sun.jersey.api.client.WebResource.get(WebResource.java:191)

Answer 1

How about google-api-java-client ?

At some level all you need is the ability to make HTTP requests and parse the response as JSON. What features are you looking for beyond that that make Jersey/Sitebricks more attractive to you?

Answer 2

Try jello-framework . It lets you expose your data model via RESTful (OData) service and it provides UI views out-of-the-box so you can test your application and start interacting with the data instantly.

Disclosure - I am the creator of Jello framework. Nevertheless, I decided to add it as a valid answer for RESTful client on GAE as it can provide a good solution for the asked question.