VB 14.0.0 error re org.eclipse.rdf4j.repository

[Jeannine Beeken]

Hi, when I was taking screenshots of VB 14.0.0 views etc. for training purposes an error message appeared suddenly, telling me: 'Cannot invoke "org.eclipse.rdf4j.repository.RepositoryConnection.close()" because "conn" is null'.

Could you please advise me what caused the error. Would it be an application error or an error from my side, thanks.

Best wishes,

Jeannine

[Jeannine Beeken]

Hi, similar error messages appear when editing a multilingual thesaurus in VB 14.0.0.  Did  anyone experience the same issue re 'Cannot invoke "org.eclipse.rdf4j.repository.RepositoryConnection.close()" because "conn" is null'.  According to the internal IT team it is an application error. What should or could be done to prevent this, thanks.

Best wishes,

Jeannine

[stel...@uniroma2.it]

Dear Jeannine,

 

By first, apologies for not replying earlier.

Put simply, that’s an error that shouldn’t happen, so it’s difficult for us to guess, but let’s try!

Surely some more context can help:

• Which triple store are you using? Internal one or external?, and in case which triple store: GDB or RDF4J? which version of it?
• Have you tried to restart it (mainly the triple store, but restarting everything not bad either :-D ) and the problem persists?

 

Kind Regards,

 

Armando

 

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[Randall, Martin]

Hi Armando

 

Thanks for your reply. I can add some context on Jeannine’s behalf.

 

We are running VocBench (14.0.0) and GraphDB (10.6.2) in 2 Docker containers hosted as Fargate services on AWS. It appears to be an intermittent problem that occurs randomly. We have restarted the GraphDB service since it became ‘unreachable’ and no projects could be opened but this issue looks to be ongoing.

 

Thanks

 

Martin

 

 

From: vocben...@googlegroups.com <vocben...@googlegroups.com> On Behalf Of stel...@uniroma2.it
Sent: 22 May 2025 08:56
To: Beeken, Jeannine C T <jeannin...@essex.ac.uk>; 'vocbench-user' <vocben...@googlegroups.com>
Subject: RE: [vocbench-user] Re: VB 14.0.0 error re org.eclipse.rdf4j.repository

 

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[stel...@uniroma2.it]

Dear Randall,

 

thanks for the feedback and added information. Like I said to Jeannine, it’s very tricky because we have several installations with 10.6.2 and we didn’t experience this.

I recall one case, where the AWS were on different regions (or at least, different mediators for AWS provision); plus it seems they experienced that once and it went away after a triple store reboot. Can’t say it’s not a bug (can still be one that surfaces for some asynchronous reason only in certain scenarios) but hard to locate it, whether it’s a VB thing or a GDB one and in case of VB whether that’s an issue in some dependency (e.g. Spring) or in our code, as it could be something related to overlapping info (setting up the connections) among threads.

That’s absolutely not to throw in the towel, but given that we can’t replicate, it will be a though investigation. Hope to come back to you at the soonest.

Apologies for the inconvenience,

Armando

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