端点上的身份验证会引发InvocationTargetexception

Question

那里。 我使用Google Cloud Engine创建了一个API，该API使用Firebase进行身份验证。但是我总是打电话给这个Api，响应是：

{
"error": {
"errors": [
  {
    "domain": "global",
    "reason": "badRequest",
    "message": "java.lang.reflect.InvocationTargetException"
  }
],
"code": 400,
"message": "java.lang.reflect.InvocationTargetException"
}
}

如果我删除参数“用户用户”，我会得到200次成功回复。

这是我的代码：

@Api(
    name = "crumb",
    version="v2",
    authenticators = {EspAuthenticator.class},
    issuers = {
            @ApiIssuer(
                    name = "firebase",
                    issuer = "https://securetoken.google.com/[Project-ID]",
                    jwksUri = "https://www.googleapis.com/service_accounts/v1/metadata/x509/securetoken@system.gserviceaccount.com")
    },
    issuerAudiences = {
            @ApiIssuerAudience(name = "firebase", audiences = "[Project-ID]")
    }
)

public class crumbAPI {


   @ApiMethod(name = "getCrumbById",path = "{crumbId}",httpMethod = ApiMethod.HttpMethod.GET)
   public Object getCrumbById(User user, @Named("crumbId") String crumbId) throws IOException, NotFoundException, UnauthorizedException {

        if (user == null) {
              throw new UnauthorizedException("Invalid credentials");
        }

        CrumbInfo ci = CrumbInfo.entityToCrumb(crumbId);
        Bean response = new Bean();
        response.setData(ci);
        return response;

  }
}

我用它有一个参考：Authenticating Users