Not list folders in WellKnownFolderName.Inbox

[yonus]

Hello ,
I want to list folder in Inbox as following code, I get error as following.

FolderView folderView = new FolderView(100);
FindFoldersResults results = service.findFolders(WellKnownFolderName.Inbox, folderView);

Error:
microsoft.exchange.webservices.data.core.exception.service.remote.ServiceRequestException: The request failed. The request failed schema validation: The 'Id' attribute is invalid - The value 'ınbox' is invalid according to its datatype 'http://schemas.microsoft.com/exchange/services/2006/types:DistinguishedFolderIdNameType' - The Enumeration constraint failed.
at microsoft.exchange.webservices.data.core.request.SimpleServiceRequestBase.internalExecute(SimpleServiceRequestBase.java:74)
at microsoft.exchange.webservices.data.core.request.MultiResponseServiceRequest.execute(MultiResponseServiceRequest.java:158)
at microsoft.exchange.webservices.data.core.ExchangeService.internalFindFolders(ExchangeService.java:377)
at microsoft.exchange.webservices.data.core.ExchangeService.findFolders(ExchangeService.java:425)
at microsoft.exchange.webservices.data.core.ExchangeService.findFolders(ExchangeService.java:461)
at com.teb.pusula.calendar.service.CalenderService.getCalenderFolderds(CalenderService.java:94)
at com.teb.pusula.calendar.service.Main.main(Main.java:14)
Caused by: microsoft.exchange.webservices.data.core.exception.service.remote.ServiceResponseException: The request failed schema validation: The 'Id' attribute is invalid - The value 'ınbox' is invalid according to its datatype 'http://schemas.microsoft.com/exchange/services/2006/types:DistinguishedFolderIdNameType' - The Enumeration constraint failed.
at microsoft.exchange.webservices.data.core.request.ServiceRequestBase.processWebException(ServiceRequestBase.java:548)
at microsoft.exchange.webservices.data.core.request.ServiceRequestBase.validateAndEmitRequest(ServiceRequestBase.java:641)
at microsoft.exchange.webservices.data.core.request.SimpleServiceRequestBase.internalExecute(SimpleServiceRequestBase.java:62)
... 6 more

[vardaru]

I gor the same error while trying access WellKnownFolderName.INBOX. My locale was ISO_8859 (turkish).
In writeAttributesToXml function of FolderId.java there is a toLowerCase() usage. That is the cause of the problem because "I".toLowercase()=="ı" (i without dot on top) in turkish.
So I changed that code as:
...

public void writeAttributesToXml(EwsServiceXmlWriter writer)
      throws ServiceXmlSerializationException {
    if (this.getFolderName() != null) {
      writer.writeAttributeValue(XmlAttributeNames.Id, this
          .getFolderName().toString().toLowerCase(Locale.ENGLISH));
      if (this.mailbox != null) {
        try {
          this.mailbox.writeToXml(writer, XmlElementNames.Mailbox);
        } catch (Exception e) {
          throw new ServiceXmlSerializationException(e.getMessage());
        }
      }
    } else {
      super.writeAttributesToXml(writer);
    }
  }

...

It works and does not breaks any tests.