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我正在尝试在Google App Engine（Java）上创建一个使用Json的REST风格的Web服务客户端。我试过了Sitebricks和Jersey，但他们都没有工作。有没有可用于在GAE上创建RESTful Web服务客户端的框架？如何在Google App Engine上创建RESTful客户端？
异常的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)
而对于网队：
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)
看起来您可能在发出您的“GET”请求之前缺少凭证认证步骤。您可能需要先登录服务来建立会话。在发布GET之前，在客户端上设置您的身份验证模型和凭证。 –
我遵循http://tugdualgrall.blogspot.com/2010/02/create-and-deploy-jax-rs-rest-service.html，它为我工作没有任何问题。 –
@LarryHector不，不是，它在没有认证的简单Jetty上完美运行。 AccessControlException是由于AppEngine中的沙箱限制。 –