POJO到Google App Engine中的XML字符串？

问题描述

我想为我的Java Google App Engine程序创建一个REST接口。我想我会从我的POJOS生成一些XML开始。但是，似乎XStream被GAE的限制所困扰。

我可以在Google App Engine中使用什么来生成XML字符串？

谢谢。

编辑1：
这是异常的开始：

  javax.servlet.ServletContext log：分派传入RPC调用时的异常
 com.google.gwt.user.server.rpc.UnexpectedException：服务方法'public abstract java。 lang.String com.mydomain.client.ObjectService.sendObject（com.mydomain.client.models.myobject）'抛出一个意外的异常：java.security.AccessControlException：访问被拒绝（java.io.SerializablePermission enableSubclassImplementation）
  

解决方案

异常是由java.io.SerializablePermission引起的，它根据javadoc允许：

XStream可能使用对象流并且不会被授予此权限。

Google App Engine实际上是否有白名单，或者只是一组受限制的权限？ JAXB2不使用Object流，所以你真的尝试过吗？

I would like to create a REST interface for my Java Google App Engine program. I figured I would start by generating some XML from my POJOS. However, it seems that XStream is bitten by GAE's restrictions.

What can I use to generate an XML string in Google App Engine?

Thanks.

Edit 1:Here is the beginning of the exception:

javax.servlet.ServletContext log: Exception while dispatching incoming RPC call
com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract    java.lang.String com.mydomain.client.ObjectService.sendObject(com.mydomain.client.models.myobject)' threw an unexpected exception: java.security.AccessControlException: access denied (java.io.SerializablePermission enableSubclassImplementation)

解决方案

The exception is caused by a java.io.SerializablePermission, which according the javadoc is for allowing:

XStream might be using Object streams under the covers, and falling foul of this permission not being granted.

Does Google App Engine actually have a whitelist, or just a set of restricted permissions? JAXB2 doesn't use Object streams, so have you actually tried that?

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