GWT无法从Hibernate序列化我的对象

时间：2010-12-01 00:00:21

标签： hibernate serialization gwt

这是我收到的错误。我到处寻找答案，我无法弄清楚为什么其他人没有遇到同样的问题。当我从Hibernate检索Proposal对象时发生错误，该对象在两个属性（作者和顾问）上具有与User_Info的多对一约束。如果需要，我可以提供类和休眠配置。只是一个注释，我实现了isSerializeable并且有空的构造函数......我非常感谢任何建议或帮助...... 

Starting Jetty on port 8888
   [WARN] Exception while dispatching incoming RPC call
com.google.gwt.user.client.rpc.SerializationException: java.lang.reflect.InvocationTargetException
 at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeWithCustomSerializer(ServerSerializationStreamWriter.java:760)
 at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:723)
 at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:612)
 at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:129)
 at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter$ValueWriter$8.write(ServerSerializationStreamWriter.java:152)
 at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:534)
 at com.google.gwt.user.server.rpc.RPC.encodeResponse(RPC.java:609)
 at com.google.gwt.user.server.rpc.RPC.encodeResponseForSuccess(RPC.java:467)
 at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:564)
 at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:188)
 at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:224)
 at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
 at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
 at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
 at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
 at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
 at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
 at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
 at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
 at org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:49)
 at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
 at org.mortbay.jetty.Server.handle(Server.java:324)
 at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
 at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843)
 at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647)
 at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
 at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
 at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:396)
 at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)
Caused by: java.lang.reflect.InvocationTargetException
 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:616)
 at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeWithCustomSerializer(ServerSerializationStreamWriter.java:742)
 ... 30 more
**Caused by: com.google.gwt.user.client.rpc.SerializationException: Type 'edu.scranton.segpis.client.shared.User_Info_$$_javassist_2' was not included in the set of types which can be serialized by this SerializationPolicy or its Class object could not be loaded. For security purposes, this type will not be serialized.: instance = edu.scranton.segpis.client.shared.User_Info@1497d11**
 at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:610)
 at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:129)
 at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter$ValueWriter$8.write(ServerSerializationStreamWriter.java:152)
 at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:534)
 at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:700)
 at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:730)
 at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:612)
 at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:129)
 at com.google.gwt.user.client.rpc.core.java.util.Collection_CustomFieldSerializerBase.serialize(Collection_CustomFieldSerializerBase.java:43)
 at com.google.gwt.user.client.rpc.core.java.util.ArrayList_CustomFieldSerializer.serialize(ArrayList_CustomFieldSerializer.java:36)
 ... 35 more
[ERROR] 500 - POST /uofsisweb/thesisproposal (127.0.0.1) 57 bytes
   Request headers
      Host: 127.0.0.1:8888
      User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.12) Gecko/20101027 Ubuntu/10.10 (maverick) Firefox/3.6.12
      Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
      Accept-Language: en-us,en;q=0.5
      Accept-Encoding: gzip,deflate
      Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
      Keep-Alive: 115
      Connection: keep-alive
      Cache-Control: no-cache
      Referer: 

      X-GWT-Permutation: HostedMode
     X-GWT-Module-Base: 

      Content-Type: text/x-gwt-rpc; charset=utf-8
      Content-Length: 185
      Pragma: no-cache
   Response headers
      Content-Type: text/plain

2 个答案:

答案 0 :(得分：0)

Hibernate使用CGLIB来改变它加载运行时的对象，这是为了实现对象关系的延迟加载。 Hibernate还使用内部延迟加载集合（列表，映射），具体取决于映射。

这两件事都会让GWT窒息。确保为GWT提供“干净”对象的一种方法是通过创建对象的全新实例来克隆它们，并将所有hibernate创建的值设置为干净的。

另一种方法是进行基于反射的对象遍历，确保没有潜伏的奇怪类型。

在你的情况下，它似乎会阻碍User_Info中的某些事情：

edu.scranton.segpis.client.shared.User_Info_$$_javassist_2'

也许你可以隔离有问题的字段（将一个字段标记为transient，只是为了查看它是哪一个） - 然后修复该字段。

答案 1 :(得分：0)

要管理此错误，可以使用多个选项，您可以在此处查看： http://code.google.com/intl/fr-FR/webtoolkit/articles/using_gwt_with_hibernate.html

新的GWT 2.1.0版本附带了RequestFactory，它解决了JPA（以及Hibernate）的这个错误。

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