泽西1.17在谷歌应用程序引擎

Question

我部署在谷歌应用程序引擎我的REST服务，我收到每一次我尝试查询服务下列错误：

com.sun.jersey.core.spi.component.ProviderFactory __getComponentProvider: The provider class, class com.sun.jersey.core.impl.provider.entity.MimeMultipartProvider, could not be instantiated. Processing will continue but the class will not be utilized 
java.lang.SecurityException: Unable to get members for class com.sun.jersey.core.impl.provider.entity.MimeMultipartProvider 
    at com.google.appengine.runtime.Request.process-7d6711107bb7eaaa(Request.java) 
    at java.lang.Class.getDeclaredMethods(Class.java:253) 
    at com.sun.jersey.core.reflection.MethodList.getAllDeclaredMethods(MethodList.java:70) 
    at com.sun.jersey.core.reflection.MethodList.<init>(MethodList.java:64) 
    at com.sun.jersey.core.spi.component.ComponentConstructor.getPostConstructMethods(ComponentConstructor.java:131) 
    at com.sun.jersey.core.spi.component.ComponentConstructor.<init>(ComponentConstructor.java:123) 
    at com.sun.jersey.core.spi.component.ProviderFactory.__getComponentProvider(ProviderFactory.java:165) 
    at com.sun.jersey.core.spi.component.ProviderFactory.getComponentProvider(ProviderFactory.java:137) 
    at com.sun.jersey.core.spi.component.ProviderServices.getComponent(ProviderServices.java:256) 
    at com.sun.jersey.core.spi.component.ProviderServices.getServices(ProviderServices.java:160) 
    at com.sun.jersey.core.spi.factory.MessageBodyFactory.initReaders(MessageBodyFactory.java:176) 
    at com.sun.jersey.core.spi.factory.MessageBodyFactory.init(MessageBodyFactory.java:162) 
    at com.sun.jersey.server.impl.application.WebApplicationImpl._initiate(WebApplicationImpl.java:1310) 
    at com.sun.jersey.server.impl.application.WebApplicationImpl.access$700(WebApplicationImpl.java:168) 
    at com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:774) 
    at com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:770) 
    at com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:193) 
    at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:770) 
    at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:765) 
    at com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:489) 
    at com.sun.jersey.spi.container.servlet.ServletContainer$InternalWebComponent.initiate(ServletContainer.java:319) 
    at com.sun.jersey.spi.container.servlet.WebComponent.load(WebComponent.java:605) 
    at com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:210) 
    at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:374) 
    at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:557) 
    at javax.servlet.GenericServlet.init(GenericServlet.java:212) 
    at org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:440) 
    at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:263) 
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) 
    at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:685) 
    at org.mortbay.jetty.servlet.Context.startContext(Context.java:140) 
    at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250) 
    at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517) 
    at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467) 
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) 
    at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:454) 
    at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:461) 
    at com.google.tracing.TraceContext.runInContext(TraceContext.java:703) 
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:338) 
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:330) 
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:458) 
    at java.lang.Thread.run(Thread.java:679) 
Caused by: java.lang.reflect.InvocationTargetException 
    at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:616) 
    ... 41 more 
Caused by: java.lang.NoClassDefFoundError: javax/mail/MessagingException 
    at java.lang.Class.getDeclaredMethods0(Native Method) 
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2444) 
    ... 41 more 
Caused by: java.lang.ClassNotFoundException: javax.mail.MessagingException 
    at com.google.appengine.runtime.Request.process-7d6711107bb7eaaa(Request.java) 
    ... 41 more 

此服务不使用或发送任何邮件。只有一件事是从一些POJO编写JSON响应。它当然适用于本地（在本地GAE和本地Tomcat上）。

Answer 1

这可能是版本的兼容性问题。根据this，与Google App Engine兼容的Jersey版本是1.5和1.1.5。

我有类似的问题，我不喜欢这个版本的兼容性问题，所以我选择了：

• 从GAE提供REST Web服务，使用Google Cloud Endpoints，这仍然是一个实验性的技术，但作为就我所尝试的那样，它工作得很好。此外，它与GAE和Google Plugin for Eclipse很好地结合在一起。

• 为了从GAE中获取REST服务，我选择了仅使用Java内置HTTP客户端库，如here所解释的。我不知道这是否是最好的方法，但它非常简单，并且避免了GAE和泽西岛等外部API之间可能出现的兼容性问题。

Answer 2

我在GitHub上创建了GAE REST骨架应用程序。这是在https://github.com/deege/gae-rest-skeleton

该应用程序只有两个REST调用定义，但它会给你一个起点。它使用GAE 1.9.4和Jersey 1.17.1。

你可以从https://github.com/deege/gae-rest-skeleton.git分叉代码