我从数据存储区删除blob数据遇到了一些奇怪的问题。并一遍又一遍地搜索，但我找不到任何相关的解决方案。这引出了我的第一个问题。
问题是我无法删除blob数据。它在本地正常工作，但每次部署到GAE后都会失败。
以下是我用来删除blob数据的代码
BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();
BlobInfoFactory bif = new BlobInfoFactory();
BlobKey bk = new BlobKey("the string blob key here");
BlobInfo blobInfo = bif.loadBlobInfo(bk);
if (blobInfo != null) {
blobstoreService.delete(new BlobKey(personKey.getName()));
System.out.println("deleted");
Struts Problem Report
Struts has detected an unhandled exception:
Messages:
The key.path.element.type "__BlobInfo__" is reserved.
File: com/google/appengine/api/datastore/DatastoreApiHelper.java
Line number: 39
Stacktraces
java.lang.IllegalArgumentException: The key.path.element.type "__BlobInfo__" is reserved.
com.google.appengine.api.datastore.DatastoreApiHelper.translateError(DatastoreApiHelper.java:39)
com.google.appengine.api.datastore.DatastoreApiHelper$1.convertException(DatastoreApiHelper.java:76)
com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:94)
com.google.appengine.api.datastore.AsyncDatastoreServiceImpl$10.get(AsyncDatastoreServiceImpl.java:622)
com.google.appengine.api.datastore.AsyncDatastoreServiceImpl$10.get(AsyncDatastoreServiceImpl.java:618)
com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:86)
com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:86)
com.google.appengine.api.datastore.FutureHelper.getInternal(FutureHelper.java:71)
com.google.appengine.api.datastore.FutureHelper.quietGet(FutureHelper.java:32)
com.google.appengine.api.datastore.DatastoreServiceImpl$3.runInternal(DatastoreServiceImpl.java:121)
com.google.appengine.api.datastore.DatastoreServiceImpl$3.runInternal(DatastoreServiceImpl.java:118)
com.google.appengine.api.datastore.TransactionRunner.runInTransaction(TransactionRunner.java:29)
com.google.appengine.api.datastore.DatastoreServiceImpl.delete(DatastoreServiceImpl.java:118)
com.google.appengine.api.datastore.DatastoreServiceImpl.delete(DatastoreServiceImpl.java:107)
root.service.CloudService.delete(CloudService.java:114)
root.action.cloud.CloudAction.doDelete(CloudAction.java:75)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:45)
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:450)
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:289)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:252)
org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:167)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)
org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:239)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:239)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:252)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:161)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:563)
org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
org.mortbay.jetty.Server.handle(Server.java:326)
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:435)
com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:442)
com.google.tracing.CurrentContext.runInContext(CurrentContext.java:186)
com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:306)
com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:298)
com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:439)
java.lang.Thread.run(Thread.java:724)
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