Backgroundjob error messages: SyncJob does not exist

Steps to reproduce

1. Automatically run occ via cron

Note: I once installed the LDAP App and enabled it, but never configured it. It was just to see the screen how it looks like. Then I disabled the app but did not remove it.

Note: Grepping eg for LDAP in the log only shows entried past 2019.05.21 which was as far I remember the day I did the upgrade to 10.2

Expected behaviour

No error message for backgroundjobs

Actual behaviour

Getting error messages for backgroundjobs:
Could not resolve OCA SyncJob does not exist
CleanUp! Class OCA\\\\OAuth2
SyncJob! Class OCA\\\\DAV
UpdateGroups! Class OCA\\\\User_LDAP

Server configuration

Operating system: Ubuntu 16.04

Web server: nginx

Database: mysql

PHP version: 7.0

ownCloud version: 10.2.0.5

Updated from an older ownCloud or fresh install: updated

Where did you install ownCloud from: tar

Signing status (ownCloud 9.0 and above):

No errors have been found.

The content of config/config.php:

{
    "system": {
        "instanceid": "oct7bkicorxf",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "xxx"
        ],
        "datadirectory": "\/var\/www\/owncloud\/data",
        "overwrite.cli.url": "https:\/\/xxxx",
        "htaccess.RewriteBase": "\/",
        "dbtype": "mysql",
        "version": "10.2.0.5",
        "dbname": "owncloud",
        "dbhost": "localhost",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "logtimezone": "Europe\/Vienna",
        "installed": true,
        "filelocking.enabled": "true",
        "memcache.local": "\\OC\\Memcache\\Redis",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "localhost",
            "port": 6379,
            "timeout": 0,
            "dbindex": 0
        },
        "filesystem_check_changes": 1,
        "loglevel": 2,
        "mail_smtpmode": "smtp",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpsecure": "tls",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpauthtype": "LOGIN",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "587",
        "maintenance": false,
        "theme": "",
        "preview_max_scale_factor": 1,
        "excluded_directories": [
            ".snapshot",
            "~snapshot"
        ],
        "upgrade.automatic-app-update": true,
        "quota_include_external_storage": false,
        "singleuser": false,
        "apps_paths": [
            {
                "path": "\/var\/www\/owncloud\/apps",
                "url": "\/apps",
                "writable": false
            },
            {
                "path": "\/var\/www\/owncloud\/apps-external",
                "url": "\/apps-external",
                "writable": true
            }
        ],
        "show_server_hostname": false,
        "ldapIgnoreNamingRules": false
    }
}

List of activated apps:

Enabled:
  - activity: 2.4.2
  - audioplayer: 2.7.1
  - comments: 0.3.0
  - configreport: 0.2.0
  - dav: 0.4.0
  - federatedfilesharing: 0.4.0
  - federation: 0.1.0
  - files: 1.5.2
  - files_external: 0.7.1
  - files_external_dropbox: 1.1.0
  - files_external_ftp: 0.2.1
  - files_pdfviewer: 0.11.0
  - files_sharing: 0.11.0
  - files_texteditor: 2.3.0
  - files_trashbin: 0.9.1
  - files_versions: 1.3.0
  - files_videoplayer: 0.10.1
  - firstrunwizard: 1.2.0
  - gallery: 16.1.1
  - guests: 0.8.1
  - market: 0.4.0
  - notifications: 0.5.0
  - provisioning_api: 0.5.0
  - systemtags: 0.3.0
  - templateeditor: 0.4.0
  - updatenotification: 0.2.1
Disabled:
  - encryption
  - external
  - files_clipboard
  - user_external
  - user_ldap

Are you using external storage, if yes which one: local/smb/sftp/google drive, dropbox

Are you using encryption: no

Are you using an external user-backend, if yes which one: no

Client configuration

Browser: Opera

Operating system: W10x64

Logs

Web server error log

Not relevant

ownCloud log (data/owncloud.log)

{"reqId":"HAtiD0LKHgy0Bh44vG0o","level":3,"time":"2019-06-18T23:45:02+02:00","remoteAddr":"","user":"--","app":"core","method":"--","url":"--","message":"Exception: {\"Exception\":\"OCP\\\\AppFramework\\\\QueryException\",\"Message\":\"Could not resolve OCA\\\\OAuth2\\\\BackgroundJob\\\\CleanUp! Class OCA\\\\OAuth2\\\\BackgroundJob\\\\CleanUp does not exist\",\"Code\":0,\"Trace\":\"
#0 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/AppFramework\\\/Utility\\\/SimpleContainer.php(110): OC\\\\AppFramework\\\\Utility\\\\SimpleContainer->resolve('OCA\\\\\\\\OAuth2\\\\\\\\Back...')\\
n#1 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/ServerContainer.php(86): OC\\\\AppFramework\\\\Utility\\\\SimpleContainer->query('OCA\\\\\\\\OAuth2\\\\\\\\Back...')\\
n#2 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/BackgroundJob\\\/JobList.php(253): OC\\\\ServerContainer->query('OCA\\\\\\\\OAuth2\\\\\\\\Back...')\\
n#3 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/BackgroundJob\\\/JobList.php(209): OC\\\\BackgroundJob\\\\JobList->buildJob(Array)\\
n#4 \\\/var\\\/www\\\/owncloud\\\/cron.php(114): OC\\\\BackgroundJob\\\\JobList->getNext()\\
n#5 {main}\",\"File\":\"\\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/AppFramework\\\/Utility\\\/SimpleContainer.php\",\"Line\":96}"}

{"reqId":"tEZiKB0VZhumIdDiX8Ec","level":3,"time":"2019-06-18T23:00:03+02:00","remoteAddr":"","user":"--","app":"core","method":"--","url":"--","message":"Exception: {\"Exception\":\"OCP\\\\AppFramework\\\\QueryException\",\"Message\":\"Could not resolve OCA\\\\DAV\\\\CardDAV\\\\Sync\\\\SyncJob! Class OCA\\\\DAV\\\\CardDAV\\\\Sync\\\\SyncJob does not exist\",\"Code\":0,\"Trace\":\"
#0 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/AppFramework\\\/Utility\\\/SimpleContainer.php(110): OC\\\\AppFramework\\\\Utility\\\\SimpleContainer->resolve('OCA\\\\\\\\DAV\\\\\\\\CardDAV...')\\
n#1 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/ServerContainer.php(86): OC\\\\AppFramework\\\\Utility\\\\SimpleContainer->query('OCA\\\\\\\\DAV\\\\\\\\CardDAV...')\\
n#2 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/BackgroundJob\\\/JobList.php(253): OC\\\\ServerContainer->query('OCA\\\\\\\\DAV\\\\\\\\CardDAV...')\\
n#3 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/BackgroundJob\\\/JobList.php(209): OC\\\\BackgroundJob\\\\JobList->buildJob(Array)\\
n#4 \\\/var\\\/www\\\/owncloud\\\/cron.php(114): OC\\\\BackgroundJob\\\\JobList->getNext()\\
n#5 {main}\",\"File\":\"\\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/AppFramework\\\/Utility\\\/SimpleContainer.php\",\"Line\":96}"}

{"reqId":"IxZlSS20TS8Gz8AoPtvV","level":3,"time":"2019-06-19T02:45:03+02:00","remoteAddr":"","user":"--","app":"core","method":"--","url":"--","message":"Exception: {\"Exception\":\"OCP\\\\AppFramework\\\\QueryException\",\"Message\":\"Could not resolve OCA\\\\User_LDAP\\\\Jobs\\\\UpdateGroups! Class OCA\\\\User_LDAP\\\\Jobs\\\\UpdateGroups does not exist\",\"Code\":0,\"Trace\":\"
#0 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/AppFramework\\\/Utility\\\/SimpleContainer.php(110): OC\\\\AppFramework\\\\Utility\\\\SimpleContainer->resolve('OCA\\\\\\\\User_LDAP\\\\\\\\J...')\\
n#1 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/ServerContainer.php(86): OC\\\\AppFramework\\\\Utility\\\\SimpleContainer->query('OCA\\\\\\\\User_LDAP\\\\\\\\J...')\\
n#2 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/BackgroundJob\\\/JobList.php(253): OC\\\\ServerContainer->query('OCA\\\\\\\\User_LDAP\\\\\\\\J...')\\
n#3 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/BackgroundJob\\\/JobList.php(209): OC\\\\BackgroundJob\\\\JobList->buildJob(Array)\\
n#4 \\\/var\\\/www\\\/owncloud\\\/cron.php(114): OC\\\\BackgroundJob\\\\JobList->getNext()\\
n#5 {main}\",\"File\":\"\\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/AppFramework\\\/Utility\\\/SimpleContainer.php\",\"Line\":96}"}

@DeepDiver1975 mind to take a look on respectively point to someone who could cover that?

Start with lib/private/BackgroundJob/JobList.php and cron.php, following the logged failures through SimpleContainer.php. Reproduce or inspect how queued jobs from OAuth2, DAV, and User_LDAP are resolved after apps are disabled or updated. Done means cron no longer logs missing background-job classes while valid jobs continue to run.