Setup Hibernate for SAP HANA in your Eclipse project

To complete this tutorial, you will need:

• Eclipse IDE for Java EE Developers Neon or newer (other Eclipse packages may require to manually install additional components)
• The SAP HANA Client (available using the SAP HANA, express edition download manager or from the SAP Store)

You will also need an instance of SAP HANA 2.0, express edition (SPS02 revision 21 or newer), and both package, the Server only and Server + Applications, works.

To get your instance up and running, you can check the available options and get started on the SAP HANA, express edition product page.

Open the Eclipse IDE.

Create a new Maven project by selecting File -> New -> Maven Project from the menu bar.

Note: if you can’t find the Maven Project entry in the menu as in the above screenshot, then use the Other option and search for Maven Project

Check Create a simple project and click on Next.

Click on Next again

Note: after you click on Next, the Maven Archetype will be downloaded. If you receive errors like Could not resolve archetype, it is likely that your Maven repository is either corrupted or not properly configured to use a proxy. Refer to the Maven Configuring a proxy documentation.

Next, enter a group ID (like com.sap.hana.hibernate), an artefact ID (like tutorial) and package name for the project.

Then click on Finish.

Your project is now created.

Open the pom.xml file and switch to the Dependencies tab.

Click on Add in the Dependencies area (not the Dependency Management).

Enter the following details:

• Group Id: org.hibernate
• Artifact Id: hibernate-core
• Version: 5.2.12.Final

Click on OK

Save the pom.xml file.

The project should rebuild automatically.

Follow the steps from the tutorial Connect to SAP HANA, express edition using JDBC to add the JDBC driver to your Eclipse project.

This tutorial will also help you identify your system details (server host, port, username and password).

Create a file named persistence.xml in tutorial/src/main/resources/META_INF using the File -> New -> File menu bar.

Paste the following content into the persistence.xml file:

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="1.0">
    <persistence-unit name="Tutorial">
        <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
        <properties>
            <property name="hibernate.dialect" value="org.hibernate.dialect.HANAColumnStoreDialect"/>
            <property name="hibernate.connection.driver_class" value="com.sap.db.jdbc.Driver"/>
            <!-- update the <server host> and <port>-->
            <property name="hibernate.connection.url" value="jdbc:sap://<server host>:<port>"/>
            <!-- update the <username>-->
            <property name="hibernate.connection.username" value="<username>"/>
            <!-- update the <password>-->
            <property name="hibernate.connection.password" value="<password>"/>
            <!-- -->
            <property name="hibernate.connection.pool_size" value="5"/>
            <property name="hibernate.show_sql" value="true"/>
            <property name="hibernate.format_sql" value="true"/>
            <property name="hibernate.hbm2ddl.auto" value="create-drop"/>
            <property name="hibernate.bytecode.provider" value="javassist" />
            <property name="hibernate.bytecode.use_reflection_optimizer" value="true" />
          	<property name="hibernate.jdbc.batch_size" value="10000" />          
        </properties>
    </persistence-unit>
</persistence>

Don’t forget to update the following property values to match your target SAP HANA instance:

• hibernate.connection.url
• hibernate.connection.username
• hibernate.connection.password

Save the persistence.xml file.

Create a new TestSetup Java class in a package named com.sap.hana.hibernate.tutorial.setup (either using a right-click on the project and choose New -> Class or use the File -> New -> Class menu bar), then paste the following content:

package com.sap.hana.hibernate.tutorial.setup;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.Query;

public class TestSetup {

	public static void main(String[] args) {
		try {
      EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory("Tutorial");
  		EntityManager entityManager = entityManagerFactory.createEntityManager();

      Query nativeQuery = entityManager.createNativeQuery("SELECT * FROM DUMMY");
			String result = String.valueOf(nativeQuery.getSingleResult());
			if ("X".equals(result)) {
				System.out.println("SUCCESS!");
			} else {
				throw new RuntimeException("Wrong result!");
			}
			entityManager.clear();
			entityManager.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
		System.exit(0);
	}
}

Save the class file.

Run the application by right-clicking the class file and choosing Run As -> Java Application or click on the icon.

You should see the following output log in your console:

nov. 07, 2017 8:30:29 AM org.hibernate.jpa.internal.util.LogHelper logPersistenceUnitInformation
INFO: HHH000204: Processing PersistenceUnitInfo [
	name: Tutorial
	...]
nov. 07, 2017 8:30:29 AM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {5.2.12.Final}
nov. 07, 2017 8:30:29 AM org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
nov. 07, 2017 8:30:29 AM org.hibernate.spatial.integration.SpatialService <init>
INFO: HHH80000001: hibernate-spatial integration enabled : true
nov. 07, 2017 8:30:29 AM org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
nov. 07, 2017 8:30:29 AM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
WARN: HHH10001002: Using Hibernate built-in connection pool (not for production use!)
nov. 07, 2017 8:30:29 AM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001005: using driver [com.sap.db.jdbc.Driver] at URL [jdbc:sap://rhhxehost:39015]
nov. 07, 2017 8:30:29 AM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001001: Connection properties: {user=SYSTEM, password=****}
nov. 07, 2017 8:30:29 AM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001003: Autocommit mode: false
nov. 07, 2017 8:30:29 AM org.hibernate.engine.jdbc.connections.internal.PooledConnections <init>
INFO: HHH000115: Hibernate connection pool size: 5 (min=1)
nov. 07, 2017 8:30:29 AM org.hibernate.dialect.Dialect <init>
INFO: HHH000400: Using dialect: org.hibernate.dialect.HANAColumnStoreDialect
nov. 07, 2017 8:30:29 AM org.hibernate.engine.jdbc.env.internal.LobCreatorBuilderImpl useContextualLobCreation
INFO: HHH000424: Disabling contextual LOB creation as createClob() method threw error : java.lang.reflect.InvocationTargetException
nov. 07, 2017 8:30:30 AM org.hibernate.tool.schema.internal.SchemaCreatorImpl applyImportSources
INFO: HHH000476: Executing import script 'org.hibernate.tool.schema.internal.exec.ScriptSourceInputNonExistentImpl@14bdbc74'
Hibernate:
    SELECT
        *
    FROM
        DUMMY
SUCCESS!