App crashes when server is in maintenance mode

[mhastu]

This issue respects the following points:

• I have read the FAQ
• I have searched for existing issues
• The issue affects the Deck Android app, neither the Deck server app nor the Nextcloud Android app.

Describe the bug

1. Open the app
2. the app crashes with following error message:

Full Crash:

App Version: 1.24.1
App Version Code: 1024001
App Flavor: fdroid

Files App Version Code: 30280090 (PROD)

---

OS Version: 4.19.157-perf-g81c35c565a1b(eng.root.20240220.211354)
OS API Level: 32
Device: FP4
Manufacturer: Fairphone
Model (and Product): FP4 (FP4eea)

The nextcloud Android app tells me the server is in maintenance mode.

Expected behavior

No response

Deck Android version

1.24.1

Deck server version

don't know, not my server

Nextcloud Android version

3.28.0

Nextcloud version

don't know, not my server

Device

FP4

Android Version

12

App Store

• Google Play Store
• Google Play Store (Beta channel)
• F-Droid
• Huawei App Gallery

Stacktrace

com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Not a JSON Object: "HTTP"
	at com.google.gson.Gson.fromJson(Gson.java:1238)
	at com.google.gson.Gson.fromJson(Gson.java:1137)
	at com.google.gson.Gson.fromJson(Gson.java:1047)
	at com.google.gson.Gson.fromJson(Gson.java:982)
	at it.niedermann.nextcloud.deck.repository.SyncRepository$3.onError(SyncRepository.java:307)
	at it.niedermann.nextcloud.deck.remote.api.RequestHelper$ResponseConsumer.onFailure(RequestHelper.java:95)
	at it.niedermann.nextcloud.deck.remote.api.RequestHelper$ResponseConsumer.onResponse(RequestHelper.java:70)
	at com.nextcloud.android.sso.helper.Retrofit2Helper$1.lambda$enqueue$0(Retrofit2Helper.java:87)
	at com.nextcloud.android.sso.helper.Retrofit2Helper$1.$r8$lambda$n0izO5V3AflskH7z1H8dSLmVKXo(Unknown Source:0)
	at com.nextcloud.android.sso.helper.Retrofit2Helper$1$$ExternalSyntheticLambda0.run(Unknown Source:6)
	at java.lang.Thread.run(Thread.java:920)
Caused by: java.lang.IllegalStateException: Not a JSON Object: "HTTP"
	at com.google.gson.JsonElement.getAsJsonObject(JsonElement.java:101)
	at it.niedermann.nextcloud.deck.remote.api.NextcloudDeserializer.deserialize(NextcloudDeserializer.java:30)
	at com.google.gson.internal.bind.TreeTypeAdapter.read(TreeTypeAdapter.java:76)
	at com.google.gson.Gson.fromJson(Gson.java:1227)
	... 10 more

[LukasFreeze]

Same problem here - "Please check whether your Nextcloud instance is not currently in maintenance mode"

It happened today after I tried clearing my app storage as suggested in #1619 to resolve sync issues I've had ever since installing the app (swiping down does not force a sync of cards I recently edited on PC, this has already cost me some data that was overwritten before I noticed this behavior)

I do not believe the server is actually in maintenance mode (hosted by IONOS, so I cannot see every setting, but everything including the deck app works fine on PC)

Nextcloud Version:
27.1.5 Enterprise

Here's the error message with (hopefully) all remaining details:

App Version: 1.24.1
App Version Code: 1024001
Server App Version: 1.11.4
App Flavor: play

Files App Version Code: 30290090 (PROD)

---

OS Version: 4.19.152-perf-28068759-abA526BXXS6FXC4(A526BXXS6FXC4)
OS API Level: 34
Device: a52xq
Manufacturer: samsung
Model (and Product): SM-A526B (a52xqnaeea)

---

com.nextcloud.android.sso.exceptions.NextcloudHttpRequestFailedException: HTTP request failed with HTTP status-code: 503
	at it.niedermann.nextcloud.deck.remote.api.RequestHelper$ResponseConsumer.onResponse(RequestHelper.java:70)
	at com.nextcloud.android.sso.helper.Retrofit2Helper$1.lambda$enqueue$0(Retrofit2Helper.java:87)
	at com.nextcloud.android.sso.helper.Retrofit2Helper$1.$r8$lambda$n0izO5V3AflskH7z1H8dSLmVKXo(Unknown Source:0)
	at com.nextcloud.android.sso.helper.Retrofit2Helper$1$$ExternalSyntheticLambda0.run(Unknown Source:6)
	at java.lang.Thread.run(Thread.java:1012)
Caused by: java.lang.RuntimeException: HTTP StatusCode wasn't 2xx:
Got [HTTP 503] for Call [GET [http://localhost//index.php/apps/deck/api/v1.1/boards/1/stacks/7/cards/38](http://localhost/index.php/apps/deck/api/v1.1/boards/1/stacks/7/cards/38)] with Message:
[<html>
<head>
<title>The page is temporarily unavailable</title>
<style>
body { font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body bgcolor="white" text="black">
<table width="100%" height="100%">
<tr>
<td align="center" valign="middle">
The page you are looking for is temporarily unavailable.<br/>
Please try again later.
<br />
4eba76321fb7f9f7530e864ae7cb2771
642e327af25d74d54b927caabdb900db
276c637d46fd45c3c9e00eb4deac65a5
</td>
</tr>
</table>
</body>
</html>
]
	at it.niedermann.nextcloud.deck.remote.api.RequestHelper$ResponseConsumer.buildCause(RequestHelper.java:87)
	... 5 more

[LukasFreeze]

Update: in my case, the problem could be solved once by...

• completely removing the saved account (clearing app data from Deck is not enough, use the account manager in the main Nextcloud app)
• restarting the phone (perhaps optional, did not test before)
• adding the account as "new" account in the Deck app

Update 2: less than a week later, the problem has returned (same error as posted above) and clearing the account data does not help this time around :-(