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Steps to Reproduce:
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Deploy the module

Unzip jpa-war.tar.gz. Its a maven module and it also contains the target directory that has the binaries

Copy target/jpa-war-1.0-SNAPSHOT.war under <wildfly-dir>/standalone/deployments folder

Add driver binary as module in wildfly

Unzip pgsql.module.tar.gz and place the contents under modules/system/layers/base/org/postgresql

Configure datasource in standalone-full.xml

Navigate to <wildfly-dir>

- Either run git apply <tmp-folder>/standalone-full.diff

- Or alternatively you can modify the standalone-full.xml manually to add/replace the datasource for postgres

Reproduce the issue:

Start the server

Run curl http://localhost:8080/jpa-war-1.0-SNAPSHOT/jpaServlet
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Deploy the module Unzip jpa-war.tar.gz. Its a maven module and it also contains the target directory that has the binaries Copy target/jpa-war-1.0-SNAPSHOT.war under <wildfly-dir>/standalone/deployments folder Add driver binary as module in wildfly Unzip pgsql.module.tar.gz and place the contents under modules/system/layers/base/org/postgresql Configure datasource in standalone-full.xml Navigate to <wildfly-dir> - Either run git apply <tmp-folder>/standalone-full.diff - Or alternatively you can modify the standalone-full.xml manually to add/replace the datasource for postgres Reproduce the issue: Start the server Run curl http://localhost:8080/jpa-war-1.0-SNAPSHOT/jpaServlet

Basically WildFly is unable to either build the persistence context or it fails to query postgres db.

The changes are so minimal that it should basically work.

Attached:

error.log - exception in the server log
jpa-war.tar.gz - maven module that can be used to reproduce the issue
pgsql.module.tar.gz - postgres driver module that can be unpacked under modules/system/layers/base/org/postgresql
standalone-full.diff - diff that can be applied to standalone-full.xml to define required datasource

Note:

Tested same steps with wildfly 13 and there its woking fine.
Tested with latest postgres driver and issue exists with v14.0.0 (and v14.0.1). Postgres driver is thus ruled out.

duplicates

WFLY-10974 NoClassDefFoundError when set-tx-query-timeout is enabled (followup to JBJCA-1378)