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Confluence cannot make a backup

Tony Montana

Hi!

WARN [ConfluenceBackupRestoreManager:thread-1] [confluence.impl.backuprestore.ConfluenceBackupRestoreManager] updateJobStateAfterCompletion Backup restore job BackupRestoreJob{id=17727489, jobOperation=BACKUP, jobScope=SPACE, jobState=PROCESSING, createTime=2023-11-22T08:15:48Z, startProcessingTime=2023-11-22T08:15:48Z, finishProcessingTime=null, cancelTime=null, owner='montana@supersite.net', whoCancelledTheJob='null', errorMessage='null'} failed: java.util.concurrent.ExecutionException: java.lang.NullPointerException: Cannot invoke \"com.atlassian.sal.api.user.UserKey.getStringValue()\" because \"userKey\" is null

Why?

I forgot to add that the problem is only with this space. All others are backed up well.

Accepted answers

Radek Dostál

I'm not familiar with that in particular, but the message is a pointer:

Cannot invoke \"com.atlassian.sal.api.user.UserKey.getStringValue()\" because \"userKey\" is null

Each user must have a userkey, that's how Confluence maps a lot of stuff.

I wonder if any of these will return anything - can you access the db?

SELECT * FROM user_mapping WHERE user_key IS NULL;

SELECT id,user_name FROM cwd_user WHERE lower_user_name NOT IN (SELECT lower_username FROM user_mapping);

Not to say these are the definitive answer, but that's where I'd start looking for a null key. Either one should return the offending user or users.

Mårten Woxberg

We had the same thing.

The workaround was to use the OLD Space Export.

All comments

Radek Dostál

I'm not familiar with that in particular, but the message is a pointer:

Cannot invoke \"com.atlassian.sal.api.user.UserKey.getStringValue()\" because \"userKey\" is null

Each user must have a userkey, that's how Confluence maps a lot of stuff.

I wonder if any of these will return anything - can you access the db?

SELECT * FROM user_mapping WHERE user_key IS NULL;

SELECT id,user_name FROM cwd_user WHERE lower_user_name NOT IN (SELECT lower_username FROM user_mapping);

Not to say these are the definitive answer, but that's where I'd start looking for a null key. Either one should return the offending user or users.

Tony Montana

@Radek Dostál Postrgres

confdb1=# SELECT * FROM user_mapping WHERE user_key IS NULL;

SELECT id,user_name FROM cwd_user WHERE lower_user_name NOT IN (SELECT lower_username FROM user_mapping);
user_key | username | lower_username
----------+----------+----------------
(0 rows)

id | user_name
----+-----------
(0 rows)

I forgot to add that the problem is only with this space. All others are backed up well.

Tony Montana

If I copy space so backup is working

Radek Dostál

Mhm, then I'm thinking during the export it tries to load some user reference (mention, author, etc.) and fails on that..

If you would be able to find the stacktrace from the backup job, we might see which methods it goes through before it throw the nullpointer. Then that would likely point us towards where to look next, what kind of content it is about.

The job should throw and print that to atlassian-confluence.log when it stops, perhaps grepping for 'NullPointerException' should make that search easy.

If the space copy works for you then perhaps this might not need solving in the end, it's not like this would seem to be anywhere common, at least internet search comes up empty.

Mårten Woxberg

We had the same thing.

The workaround was to use the OLD Space Export.

Mårten Woxberg

And since I didn't write down the workaround and had to find it again for myself here it is.

https://<url>/spaces/exportspacexml.action?key=

Miklos Tix

@Mårten Woxberg you da best, thanks for this, worked like a charm!

Esther Lansbergen

Thanks!

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