Provide @DataSourceDefinition for app-level DB config. #6819

This commit is a first test to apply database configuration and
credentials to the application server without using a config
on domain level but on application level. It is not very configurable yet.

The JNDI names have been changed to be conform with Java EE 7.
See https://github.com/javaee-samples/javaee7-samples/tree/master/jpa/datasourcedefinition-applicationxml-pu
and others for working examples. (Staying with the old name was not successfull.)

We had to use the "global" scope, so the persistent EJB timers are successfully created
and stored in the database. Using the "app" scope crashes the deployment.

src/main/java/edu/harvard/iq/dataverse/flyway/StartupFlywayMigrator.java

@@ -15,7 +15,7 @@
 @TransactionManagement(value = TransactionManagementType.BEAN)
 public class StartupFlywayMigrator {
 
-    @Resource(lookup = "jdbc/VDCNetDS")
+    @Resource(lookup = "java:global/jdbc/dataverse")
     private DataSource dataSource;
 
     @PostConstruct

src/main/java/edu/harvard/iq/dataverse/util/DataSourceProducer.java

@@ -0,0 +1,29 @@
+package edu.harvard.iq.dataverse.util;
+
+import javax.annotation.Resource;
+import javax.annotation.sql.DataSourceDefinition;
+import javax.enterprise.inject.Produces;
+import javax.inject.Singleton;
+import javax.sql.DataSource;
+
+@Singleton
+@DataSourceDefinition(
+    name = "java:global/jdbc/dataverse",
+    className = "org.postgresql.xa.PGXADataSource",
+    user = "dataverse",
+    password = "${ALIAS=db_password_alias}",
+    serverName = "postgresql",
+    portNumber = 5432,
+    databaseName = "dataverse",
+    minPoolSize = 10,
+    maxPoolSize = 200)
+public class DataSourceProducer {
+
+    @Resource(lookup="java:global/jdbc/dataverse")
+    DataSource ds;
+
+    @Produces
+    public DataSource getDatasource() {
+        return ds;
+    }
+}

src/main/resources/META-INF/persistence.xml

@@ -3,7 +3,7 @@
     <persistence-unit name="VDCNet-ejbPU" transaction-type="JTA">
         <!-- provider>oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider</provider-->
         <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
-        <jta-data-source>jdbc/VDCNetDS</jta-data-source>
+        <jta-data-source>java:global/jdbc/dataverse</jta-data-source>
         <properties>
             <!--property name="toplink.logging.level" value="FINE"/-->
 	    <!-- disabling weaving, as an experiment: - L.A. -->