Install Docker then run this commands:

The *dockerhost.local* host is *boot2docker* or *docker-machine* host on
MAC OS X or Windows. On Linux you can use 127.0.0.1

docker pull parana/jshell

export MYSQL_ROOT_PASSWORD=xpto
docker run -d --name mysql_db -p 3306:3306 \
       -e MYSQL_ROOT_PASSWORD=$MYSQL_ROOT_PASSWORD \
       -e MYSQL_DATABASE=test \
       -e MYSQL_USER=test \
       -e MYSQL_PASSWORD=test \
       mariadb bash

# Verify MySQL database connection
mysql -u root -h *dockerhost.local* -p # Please provide the password xpto
mysql> show databases;
mysql> use test;
mysql> show tables;


Running JPA test with JShell on Docker container

docker run -i -t --rm --name jshell \
       --link mysql_db:mysql \
       parana/jshell bash

# Verifying persistence.xml
jar -tvf target/myJshellAppLib.jar META-INF/persistence.xml
# Testing JAR App inside console. This run OK !
java -jar target/myJshellAppLib.jar

# Testing inside Shell. This throw an javax.persistence.PersistenceException

jshell
/classpath target/myJshellAppLib.jar
import br.com.joaoparana.*
App app = new App()
String[] args = {}
App.main(args)

Starting JPA Test with MySql Database

| javax.persistence.PersistenceException thrown: *No Persistence provider
for EntityManager named myPersistence*

| at Persistence.createEntityManagerFactory (Persistence.java:85)

| at App.getEMF (App.java:100)

| at App.main (App.java:37)

| at (#12:1)

This simple project can be viewed on
https://github.com/joao-parana/jshell/tree/master/my-jshell-app

This sound like a Classloader problem.

I hope this help.

João Antonio
​
I was able to reproduce. The problem seems to be that javax.persistence.Persistence is using Thread.getContextClassLoader() to lookup PersistenceProviders, but the context CL is not set to the REPL CL in RemoteAgent. Robert, is there a reason why we couldn't do:
Thread.currentThread().setContextClassLoader(loader);
?

It would make sense to me to set this.

Thanks,
   Jan