I get a 404 error when I'm trying to download file via Box API every time.

 you are currently making an API call as the enterprise (we call this a Service Account), not the user who owns the file. You will need to create a client for that user as is described here:

https://github.com/box/box-java-sdk#boxdevelopereditionapiconnectionasenterpriseuser

Thank you so much! I solved this problem with your teaching!!

...

...but, I got a new error :_(

At first, the corrected code is here:

class BoxFileDownload extends ApiActor with ActorLogging {
	def receive: PartialFunction[Any, Unit] = {
		case _event: HttpRequestEvent => implicit val event: HttpRequestEvent = _event
			// Load the configuration file of the BOX application
			val boxConfig = tryWith(getClass.getClassLoader.getResourceAsStream(SharedConf.planning.boxConf)) { boxConf =>
				BoxConfig.readFrom(new InputStreamReader(boxConf))
			}

			// Set a cache information
			val MAX_CACHE_ENTRIES = 100
			val accessTokenCache  = new InMemoryLRUAccessTokenCache(MAX_CACHE_ENTRIES)

			// Generate an enterprise connection object of  Box Application
			val USER_ID = SharedConf.planning.boxUserId
			val api     = new BoxDeveloperEditionAPIConnection(USER_ID, DeveloperEditionEntityType.USER, boxConfig, accessTokenCache)

			// Download the Box file
			val boxFileId = event.endPoint.getQueryString("box_file_id").getOrElse(0)
			val file      = new BoxFile(api, boxFileId.toString)
			val info      = file.getInfo()
			val tmpFile   = File.createTempFile("box-", "-download")  // 一時ファイル
			val stream    = new FileOutputStream(tmpFile)
			file.download(stream)
			stream.close()

			log.debug(s"box download file = ${tmpFile.getPath()}")

			mkFileDownloadViewFromStream(info.getName, new FileInputStream(tmpFile))
	}
}

Next, the error is:

com.box.sdk.BoxAPIResponseException: The API returned an error code [403 | p6m06xfxtnkcbelx] access_denied_insufficient_permissions - Access denied - insufficient permission
	at com.box.sdk.BoxAPIResponse.(BoxAPIResponse.java:92)
	at com.box.sdk.BoxJSONResponse.(BoxJSONResponse.java:32)
	at com.box.sdk.BoxAPIRequest.trySend(BoxAPIRequest.java:579)
	at com.box.sdk.BoxAPIRequest.send(BoxAPIRequest.java:354)
	at com.box.sdk.BoxAPIRequest.send(BoxAPIRequest.java:329)
	at com.box.sdk.BoxFile.download(BoxFile.java:295)
	at com.box.sdk.BoxFile.download(BoxFile.java:283)
	at jp.co.dac.advr.planning_web.controllers.menu.BoxFileDownload$$anonfun$receive$2.applyOrElse(Index.scala:89) = this line: file.download(stream)

Could you lend me a hand again?

I think you need to enable "As User" in your app.

See https://community.box.com/t5/Platform-and-Development-Forum/Error-access-denied-insufficient-permissions-endpoint-quot-https/td-p/33207

Thank you for replying again.

I think I already "As-User" enable my app.

If it's possible, Could you show me the configuration screen of the setting required in this case?

https://dachd.ent.box.com/developers/console/app/APP_ID/configuration

If you made a change to the permissions needed, you will need to re-approve the app at the Admin console. See https://community.box.com/t5/How-to-Guides-for-Admins/Enabling-Custom-Built-Applications/ta-p/2188 for details

> If you made a change to the permissions needed, you will need to re-approve the app at the Admin console.

I already re-approved my app after change to the permissions needed at the Admin console.

Is there any other solution?

Hey ,

Could you make a ticket with us at support.box.com? Include a link to this forum thread and we'll be able to help you out.

Thanks!

We are running into same issue. we are using oAuth2.0 connection in our App (to connect to Salesforce via Salesforce Box APIs).

We configured the application scope as documented and also added the collaborators.  We get the access token, but when trying to access the folder (via backend API),

we get the error 'BoxApiRequest.BoxApiRequestException: The Box API responded with a 404 : Not Found'.  Can you help?