SAIL is already locked

[naturzukunft]

Hi all, i share a repository between threads. one thread is a long running one, that do a initial import of ~ 900.000 triples.
While this thread is running another scheduled thread wants to access the repository and gets a "SAIL is already locked". That is ok as far as I understand it, because the repository can use a connection at this time.
But after the long running process is done, i still get the "SAIL is already locked" ;-(

2021-08-16 19:10:48.055[   scheduling-1]o.l.code.kvmadapter.KvmSync             error while updateChangedKvmEntries.run() SAIL is already locked by: 295565@fredy-HP-250-G7-Notebook-PC in /home/fredy/ws/loa-suite-ws/loa-suite/loa-app/loa-app-spring-boot/target/repoManager/repositories/kvm_loa
2021-08-16 19:10:57.677[or-http-epoll-4]o.l.c.k.i.KvmCsv2RdfRepoInitialLoad     894861 added to /home/fredy/ws/loa-suite-ws/loa-suite/loa-app/loa-app-spring-boot/target/repoManager/repositories/kvm_loa
2021-08-16 19:10:57.677[or-http-epoll-4]o.l.c.loaapp.controller.KvmController   isInitialized: true (/home/fredy/ws/loa-suite-ws/loa-suite/loa-app/loa-app-spring-boot/target/repoManager/repositories/kvm_loa)
2021-08-16 19:10:57.678[or-http-epoll-4]o.l.code.kvmadapter.KvmSync             -> UpdateChangedKvmEntries (look for changes in the last -144000 minutes.)
2021-08-16 19:10:57.678[or-http-epoll-4]o.l.code.kvmadapter.KVMRestEndpoint     getting changes between 2021-05-08T19:10:47.677913 and 2021-08-16T19:10:57.678848
2021-08-16 19:10:57.680[or-http-epoll-4]o.l.c.kvmadapter.KvmLastSyncDateStore   reading lastSync from: /home/fredy/ws/loa-suite-ws/loa-suite/loa-app/loa-app-spring-boot/target/repoManager/repositories/kvm_loa
org.eclipse.rdf4j.repository.RepositoryLockedException: SAIL is already locked by: 295565@fredy-HP-250-G7-Notebook-PC in /home/fredy/ws/loa-suite-ws/loa-suite/loa-app/loa-app-spring-boot/target/repoManager/repositories/kvm_loa
	at org.eclipse.rdf4j.repository.sail.SailRepository.initializeInternal(SailRepository.java:151)
	at org.eclipse.rdf4j.repository.base.AbstractRepository.init(AbstractRepository.java:39)
	at org.eclipse.rdf4j.repository.sail.SailRepository.getConnection(SailRepository.java:198)
	at org.eclipse.rdf4j.repository.sail.SailRepository.getConnection(SailRepository.java:55)
	at org.linkedopenactors.code.kvmadapter.KvmLastSyncDateStore.lastSync(KvmLastSyncDateStore.java:29)

i asked the repository, if it is initialized and it returns true.

In SailRepository.java:198 the init is called if "!isInitialized()". but why isn't it initialized ?
there is a knot in my head ;-)

	@Override
	public SailRepositoryConnection getConnection() throws RepositoryException {
		if (!isInitialized()) {
198			init();
		}
              ...

ups, at this place i'm still using 3.5.1, maybe i should upgrade.
.... now upgraded to 3.7.2. still the same problem..

Any Idea ?

update: i switched off the scheduled tasks and the problem is still there. So it's not a threading problem.

[naturzukunft]

Found the problem!
At some point i had the senseless idea of deleting the repository during an initial load. This must be from the time when the initial load was ain commandLineTool. And now that was pretty bad, because Spring had distributed the repository in different components. and these repositories were invalid.