我在 Google App Engine 上部署了 Spring Social 应用程序，但我在其中一个应用程序工作流程中遇到以下错误：
java.lang.NoClassDefFoundError: javax.net.ssl.KeyManagerFactory is a restricted class. Please see the Google App Engine developer's guide for more details.
at com.google.appengine.tools.development.agent.runtime.Runtime.reject(Runtime.java:51)
at org.apache.http.conn.ssl.SSLSocketFactory.createSSLContext(SSLSocketFactory.java:184)
at org.apache.http.conn.ssl.SSLSocketFactory.createDefaultSSLContext(SSLSocketFactory.java:209)
at org.apache.http.conn.ssl.SSLSocketFactory.<init>(SSLSocketFactory.java:333)
at org.apache.http.conn.ssl.SSLSocketFactory.getSocketFactory(SSLSocketFactory.java:165)
at org.springframework.social.support.HttpComponentsClientHttpRequestFactory$HttpComponentsClient_4_1.getInstance(HttpComponentsClientHttpRequestFactory.java:185)
at org.springframework.social.support.HttpComponentsClientHttpRequestFactory.<init>(HttpComponentsClientHttpRequestFactory.java:79)
at org.springframework.social.support.ClientHttpRequestFactorySelector$HttpComponentsClientRequestFactoryCreator$1.<init>(ClientHttpRequestFactorySelector.java:68)
at org.springframework.social.support.ClientHttpRequestFactorySelector$HttpComponentsClientRequestFactoryCreator.createRequestFactory(ClientHttpRequestFactorySelector.java:68)
at org.springframework.social.support.ClientHttpRequestFactorySelector.getRequestFactory(ClientHttpRequestFactorySelector.java:44)
at org.springframework.social.oauth2.ProtectedResourceClientFactory.create(ProtectedResourceClientFactory.java:56)
at org.springframework.social.oauth2.AbstractOAuth2ApiBinding.<init>(AbstractOAuth2ApiBinding.java:60)
at org.springframework.social.facebook.api.impl.FacebookTemplate.<init>(FacebookTemplate.java:107)
at saket.fb.controller.FaceBookController.attack(FaceBookController.java:35)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:100)
at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:436)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:424)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:900)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827)
我怎样才能克服这个？
我见过相关/类似的帖子/问题，但这些似乎没有回答这个问题。