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Java Liberty with SQL Database Sample

The Java DB sample demonstrates how to use JPA with a SQL service on Bluemix. The application displays a list of persisted items and lets the user add, modify, or delete them. The UI calls a RESTful CRUD JAX-RS API (/api/todolist) to retrieve, add and remove items.

Running on Bluemix

mvn install
cf push PickAUniqueName -p target/JavaDBApp.war

Then, go to Bluemix dashboard and bind the Clear DB MySQL service to the application and restage!

Running Locally

Once you pushed the initial application to Bluemix, you'll want to set up a local environment to do your development. You can continue using the same ClearDB database, or provide your own sql db.

  1. On the Bluemix dashboard select the application you created above, and then click on View Credentials under ClearDB database. Note these values for step 4.

  2. Download and upzip WebSphere Liberty.

  3. Download mysql-connector-java-5.1.32.jar and place it in $LIBERTY_HOME/wlp/usr/shared/resources/mysql. If mysql directory does not exist, create it.

  4. Configure the data source in the $LIBERTY_HOME/usr/servers/defaultServer/server.xml file

	<dataSource id='mysql-datasource' jdbcDriverRef='mysql-driver' jndiName='jdbc/mydbdatasource'> 
 		<properties databaseName="xxxxxxxx" 
			user="xxxxxxxxx" 
			password='xxxxx'
			portNumber="xxxx" serverName="xxxxxxxxx" /> 
	</dataSource>
	
	<jdbcDriver id="mysql-driver" libraryRef="mysql-library" />

	<library id="mysql-library">
		<fileset dir="${shared.resource.dir}/mysql" includes="*.jar"/>
	</library>
  1. Run mvn install and copy the target/JavaDBApp.war to $LIBERTY_HOME/usr/servers/defaultServer/dropins

Decomposition

API - JAX-RS Resource

See src/main/java/example/jpa/TODOListResource.java for the item CRUD API and obtaining the EntityManager.

JPA Configuration

See src/main/webapp/WEB-INF/web.xml & src/main/resources/META-INF/persistence.xml for JPA configuration.

UI

See src/main/webapp/WEB-INF/index.html, src/main/webapp/WEB-INF/index.js and src/main/webapp/WEB-INF/util.js for the front-end UI calling the back-end API.