Java Google Drive.Permissions.update在“中开始失败”；“500行”；例外

我使用了以下Java代码（在AppEngine中）在GoogleDrive中传输文件的所有权。突然，服务器出现“500 OK”错误，导致该操作开始失败。有什么变化了吗？原因是什么

// first add new owner as "writer"
Permission newPermission= new Permission();
newPermission.setValue(newOwnerEmail);
newPermission.setType("user");
newPermission.setRole("writer");
Insert insert = service.permissions().insert(fileId, newPermission);
newPermission = insert.execute();

// then transfer ownsership
newPermission.setRole("owner");
newPermission.setValue(newOwnerEmail);
Update update = drive.permissions().update(fileId, newPermission.getId(), newPermission);
update.setTransferOwnership(true);
update.execute(); 

异常消息就是这样的，它没有说明太多

500 OK
{
  "code" : 500,
  "message" : null
}

at com.google.api.client.googleapis.json.GoogleJsonResponseException.from(GoogleJsonResponseException.java:145)
at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:113)
at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:40)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest$1.interceptResponse(AbstractGoogleClientRequest.java:312)
at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:1045)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:410)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:343)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:460)
etc...

---

好的，我找到了具有以下修复程序的解决方案：

1） 将驱动器API库更新为1.17.0

2） 准备所有权转移时，立即将新的所有者权限角色设置为“所有者”。在早期的API版本中，它必须首先是“编写器”

下面是更正后的代码片段：

// first add new permission as "owner"
Permission newPermission= new Permission();
newPermission.setValue(newOwnerEmail);
newPermission.setType("user");
newPermission.setRole("owner");
Insert insert = service.permissions().insert(fileId, newPermission);
newPermission = insert.execute();

// then transfer ownsership
newPermission.setValue(newOwnerEmail);
Update update = drive.permissions().update(fileId, newPermission.getId(), newPermission);
update.setTransferOwnership(true);
update.execute();