編輯代理時參數類型不匹配

Question

我似乎無法弄清楚是什麼導致下面的問題。我能夠創建並保留一個B類型的對象，它具有父A（@Parent）並且具有類型C的嵌入對象。當我嘗試編輯對象時，雖然我得到下面的錯誤。什麼會導致這個錯誤？

public class A extends DatastoreObject<Long>{ 
     @Id private Long id; 

     @Override 
     public Long getId() { 
     return id; 
     } 

     public void setId(Long id) { 
     this.id = id; 
     } 

    } 

    public class C extends ValueProxy{ 
     private String name; 

     public String getName() { 
     return name; 
     } 

     public void setName(String name) { 
     this.name = name; 
     } 

    } 


    public class B extends DatastoreObject<Long>{ 
     @Id private Long id; 
     @Parent public Key<A> a; 
     public String label; 
    @Embedded 
    public C c; 

     @Override 
     public Long getId() { 
     return id; 
     } 

     public void setId(Long id) { 
     this.id = id; 
     } 

    public String getLabel() { 
     return label; 
    } 

    public void setLabel(String label) { 
     this.label = label; 
    } 

     public A getA(){ 
     if (a == null) { 
      return null; 
     } 

     try { 
      return new ADAO().get(a); 
     } catch (NotFoundException e){ 
      return null; 
     } 
     } 

     public void setA(A a) { 
     this.a = new ADAO().key(a); 
     } 

    public void setCustomer(Key<A> a){ 
     this.a = a; 
    } 

    public C getC(){ 
     return c; 
    } 
    public void setC(C c){ 
     this.c = c; 
    } 

    } 

private void updateSite(String label){ 

    BRequest bRequest = requestFactory.bRequest(); 
    BProxy b = bRequest.edit(bToEdit); //bToEdit is set when I get the object earlier 
    b.setLabel("something"); 

    siteRequest.persist(b); 
    siteRequest.fire(...); 

} 

com.google.web.bindery.requestfactory.server.RequestFactoryServlet doPost 
SEVERE: Unexpected error 
java.lang.IllegalArgumentException: argument type mismatch 
    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:104) 
    at com.google.web.bindery.requestfactory.server.ReflectiveServiceLayer.setProperty(ReflectiveServiceLayer.java:234) 
    at com.google.web.bindery.requestfactory.server.ServiceLayerDecorator.setProperty(ServiceLayerDecorator.java:193) 
    at com.google.web.bindery.requestfactory.server.ServiceLayerDecorator.setProperty(ServiceLayerDecorator.java:193) 
    at com.google.web.bindery.requestfactory.server.ServiceLayerDecorator.setProperty(ServiceLayerDecorator.java:193) 
    at com.google.web.bindery.requestfactory.server.SimpleRequestProcessor$1.visitReferenceProperty(SimpleRequestProcessor.java:529) 
    at com.google.web.bindery.autobean.vm.impl.ProxyAutoBean.traverseProperties(ProxyAutoBean.java:324) 
    at com.google.web.bindery.autobean.shared.impl.AbstractAutoBean.traverse(AbstractAutoBean.java:166) 
    at com.google.web.bindery.autobean.shared.impl.AbstractAutoBean.accept(AbstractAutoBean.java:101) 
    at com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.processOperationMessages(SimpleRequestProcessor.java:516) 
    at com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.process(SimpleRequestProcessor.java:210) 
    at com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.process(SimpleRequestProcessor.java:127) 
    at com.google.web.bindery.requestfactory.server.RequestFactoryServlet.doPost(RequestFactoryServlet.java:133) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
    at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:263) 
    at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:178) 
    at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91) 
    at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:62) 
    at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:118) 
    at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:113) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:35) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:60) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at com.google.appengine.tools.development.BackendServersFilter.doFilter(BackendServersFilter.java:97) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388) 
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) 
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) 
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765) 
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418) 
    at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:78) 
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) 
    at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:363) 
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) 
    at org.mortbay.jetty.Server.handle(Server.java:326) 
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542) 
    at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938) 
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755) 
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218) 
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) 
    at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409) 
    at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582) 

Answer 1

看起來我忘了將C對象放在我的BProxy對象類中。 whops。