Why is Ebean ORM throwing java.sql.SQLException: IJ031021: You cannot rollback during a managed transaction - jdbc

Question

I have a Jax-RS Rest service that uses Ebean to query the database. On any query I make this exception is thrown.
For example.
User currentUser = new QUser().where().id.eq(currentUserID)).findUnique();
Logs
ERROR [io.ebeaninternal.server.transaction.JdbcTransaction] (default task-10) Error when ending a query only transaction via ROLLBACK: java.sql.SQLException: IJ031021: You cannot rollback during a managed transaction
Now the query returns the appropriate user and doesn't interfere with the Jax-RS.
But I can't ignore the large code-smell
And the huge log that is created because it gets thrown on every query.
My Configuration
ServerConfig config = new ServerConfig();
config.setDataSource(ds);
config.setName("db");
config.setAutoCommitMode(false);
config.setDatabasePlatform(new PostgresPlatform());
config.setRegister(true);
config.setDefaultServer(true);
config.setTransactionRollbackOnChecked(true);
config.addPackage(User.class.getPackage().getName());
EbeanServer es = EbeanServerFactory.create(config);

Answer 1

When using ebean inside Java EE you need to configure the EbeanServer before it is used. A typical place to do it is in a #PostConstruct method in a #Startup #Singleton bean-managed transaction ejb. And you need to configure it to use the JTA transaction manager so it doesn't try to begin/commit the transactions on its own.
#Singleton
#Startup
#TransactionManagement(TransactionManagementType.BEAN)
public class AtStartup {
#Resource(mappedName = "java:jboss/datasources/EbeanTestDS")
private DataSource ds;
#SneakyThrows
#PostConstruct
public void startup() {
new MigrationRunner(new MigrationConfig()).run(ds); // begin/commits transaction for the migration...
ServerConfig config = new ServerConfig();
config.setDataSource(ds);
config.addPackage(Customer.class.getPackage().getName());
config.setUseJtaTransactionManager(true); // This is important !
config.setAutoCommitMode(false);
EbeanServerFactory.create(config);
}