Configure the CData JDBC Driver for Amazon S3 in a Connection Pool in Tomcat

The CData JDBC Drivers support standard JDBC interfaces to integrate with Web applications running on the JVM. This article details how to connect to Amazon S3 data from a connection pool in Tomcat.

Connect to Amazon S3 Data through a Connection Pool in Tomcat

1. Copy the CData JAR and CData .lic file to $CATALINA_HOME/lib. The CData JAR is located in the lib subfolder of the installation directory.
2. Add a definition of the resource to the context. Specify the JDBC URL here.

   To authorize Amazon S3 requests, provide the credentials for an administrator account or for an IAM user with custom permissions. Set AccessKey to the access key Id. Set SecretKey to the secret access key.

   Note: You can connect as the AWS account administrator, but it is recommended to use IAM user credentials to access AWS services.

   For information on obtaining the credentials and other authentication methods, refer to the Getting Started section of the Help documentation.

   Built-in Connection String Designer

   For assistance in constructing the JDBC URL, use the connection string designer built into the Amazon S3 JDBC Driver. Either double-click the JAR file or execute the jar file from the command-line.

   java -jar cdata.jdbc.amazons3.jar
   

   Fill in the connection properties and copy the connection string to the clipboard.

   👁 Using the built-in connection string designer to generate a JDBC URL (Salesforce is shown.)
   

   You can see the JDBC URL specified in the resource definition below.

   <Resource name="jdbc/amazons3" auth="Container" type="javax.sql.DataSource" driverClassName="cdata.jdbc.amazons3.AmazonS3Driver" factory="org.apache.tomcat.jdbc.pool.DataSourceFactory" url="jdbc:amazons3:AccessKey=a123;SecretKey=s123;" maxActive="20" maxIdle="10" maxWait="-1" />
   

   To allow a single application to access Amazon S3 data, add the code above to the context.xml in the application's META-INF directory.

   For a shared resource configuration, add the code above to the context.xml located in $CATALINA_BASE/conf. A shared resource configuration provides connectivity to Amazon S3 for all applications.

3. Add a reference to the resource to the web.xml for the application.

    Amazon S3 data JSP
    jdbc/AmazonS3
    javax.sql.DataSource
    Container
   
   

4. Initialize connections from the connection pool:

   Context initContext = new InitialContext();
   Context envContext = (Context)initContext.lookup("java:/comp/env");
   DataSource ds = (DataSource)envContext.lookup("jdbc/AmazonS3");
   Connection conn = ds.getConnection();
    

More Tomcat Integration

The steps above show how to connect to Amazon S3 data in a simple connection pooling scenario. For more use cases and information, see the JNDI Datasource How-To in the Tomcat documentation.