Hi Michael,

Based on the logs, it looks like you have database connection issues 
because you might have a misconfiguration. This is the line of the logs 
that seems to be the problem..

2022-06-28 18:35:11,378 WARN unknown unknown 
org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator @ 
HHH000342: Could not obtain connection to query metadata 
org.hibernate.boot.registry.selector.spi.StrategySelectionException: Unable 
to resolve name 
[org.dspace.storage.rdbms.hibernate.postgres.DSpacePostgreSQL82Dialect] as 
strategy [org.hibernate.dialect.Dialect]

That tells me that in your backend's local.cfg (or dspace.cfg) you have 
this set:

db.dialect =  
org.dspace.storage.rdbms.hibernate.postgres.DSpacePostgreSQL82Dialect

This is an OLD setting from DSpace 6.x, as that " 
DSpacePostgreSQL82Dialect" class no longer exists in DSpace 7.  In DSpace 
7, you should use the default Hibernate dialect for Postgres, so the 
correct setting is:

db.dialect = org.hibernate.dialect.PostgreSQL94Dialect

I'm not sure if that's the only problem, but it's definitely a 
misconfiguration that will cause issues in your database layer.  So, I'd 
recommend correcting that setting and restarting Tomcat, and trying the 
"./dspace database info" and "./dspace database migrate" commands again.  
Hopefully that'll fix it for you.  If it doesn't, let us know on this list 
what the new error is.

Tim

On Wednesday, June 29, 2022 at 2:08:19 AM UTC-5 scho...@macewan.ca wrote:

> Salutations!
>
> I spent the day trying to update our DSpace 7.2.1 servers to 7.3.  This 
> process has been mostly painless for all the previous versions, but this 
> time I encountered one or more problems that I've been completely unable to 
> decipher.
>
> I ran the update across two servers, one of which had some customization 
> work done (submission forms, etc) and the other was completely stock apart 
> from some migrated content.  I followed the update process as outlined (
> https://wiki.lyrasis.org/display/DSDOC7x/Upgrading+DSpace), but after I 
> was done, the server webapp did not start with Tomcat.  I tried refreshing 
> the database with my 7.2.1 backup and updating it again, having a feeling 
> something might have gone wrong with the database update.  Sure enough, 
> there was a null pointer exception during the database update... something 
> to do with updating default entity types.  But checking "./dspace database 
> info" afterward suggested that all updates were successfully installed.  So 
> I'm not sure if that's at all related to the server start problem.
>
> Moving along, I also tried erasing the database and creating it from 
> scratch using "dspace database migrate", only to get the same error once, 
> though indications the database was set up correctly afterward, just like 
> with updating the 7.2.1 database.  I also tried a fresh_install instead of 
> an update of the server files/directory and kept getting the same errors.  
> I did notice the difference in the Search core for Solr and 
> reinitialized/refreshed that core with no effect.  I copied my local.cfg 
> file from 7.2.1 unaltered on both servers.
>
> I'm attaching two error logs which should, in theory, contain only the log 
> messages related to the problem actions.  The "db_migrate_error" log is the 
> result of running "[dspace]/bin/dspace database info" followed by 
> "[dspace]/bin/dspace database migrate".  The "webapp_startup_error" log is 
> what results from trying to start tomcat and, thereby, the DSpace server.
>
> Any ideas or hints for what to try would be greatly appreciated!
>
> Michael Schouten
> Library IT
> MacEwan University
>

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