Connect to Databricks Data from a Connection Pool in Jetty

The CData JDBC driver for Databricks is easy to integrate with Java Web applications. This article shows how to efficiently connect to Databricks data in Jetty by configuring the driver for connection pooling. You will configure a JNDI resource for Databricks in Jetty.

Configure the JDBC Driver for Salesforce as a JNDI Data Source

Follow the steps below to connect to Salesforce from Jetty.

1. Enable the JNDI module for your Jetty base. The following command enables JNDI from the command-line:

   java -jar ../start.jar --add-to-startd=jndi
2. Add the CData and license file, located in the lib subfolder of the installation directory, into the lib subfolder of the context path.

3. Declare the resource and its scope. Enter the required connection properties in the resource declaration. This example declares the Databricks data source at the level of the Web app, in WEB-INF\jetty-env.xml.

   <Configure id='databricksdemo' class="org.eclipse.jetty.webapp.WebAppContext"> <New id="databricksdemo" class="org.eclipse.jetty.plus.jndi.Resource"> <Arg><Ref refid="databricksdemo"/></Arg> <Arg>jdbc/databricksdb</Arg> <Arg> <New class="cdata.jdbc.databricks.DatabricksDriver"> <Set name="url">jdbc:databricks:</Set> <Set name="Server">127.0.0.1</Set> <Set name="Port">443</Set> <Set name="TransportMode">HTTP</Set> <Set name="HTTPPath">MyHTTPPath</Set> <Set name="UseSSL">True</Set> <Set name="User">MyUser</Set> <Set name="Password">MyPassword</Set> </New> </Arg> </New> </Configure>

   To connect to a Databricks cluster, set the properties as described below.

   Note: The needed values can be found in your Databricks instance by navigating to Clusters, and selecting the desired cluster, and selecting the JDBC/ODBC tab under Advanced Options.

   • Server: Set to the Server Hostname of your Databricks cluster.
   • HTTPPath: Set to the HTTP Path of your Databricks cluster.
   • Token: Set to your personal access token (this value can be obtained by navigating to the User Settings page of your Databricks instance and selecting the Access Tokens tab).

4. Configure the resource in the Web.xml:

   jdbc/databricksdb javax.sql.DataSource Container

5. You can then access Databricks with a lookup to java:comp/env/jdbc/databricksdb: InitialContext ctx = new InitialContext(); DataSource mydatabricks = (DataSource)ctx.lookup("java:comp/env/jdbc/databricksdb");

More Jetty Integration

The steps above show how to configure the driver in a simple connection pooling scenario. For more use cases and information, see the Working with Jetty JNDI chapter in the Jetty documentation.