Define hive-jdbc JNDI data source on WebSphere - jdbc

Question

I am trying to setup a JNDI Data Source on WebSphere 8.5.5.11, using hive-jdbc.jar.
When using the console in WebSphere, and using the form to create a new JDBC provider, there is a field for the implementation class name. WebSphere requires that the class implements javax.sql.XADataSource or javax.sql.ConnectionPoolDataSource. However, the hive-jdbc driver implements non of those, it implements only java.sql.DataSource.
For this reason, it doesn't work, WebSphere reports an error when trying to save the form.
Any idea what can I do about this?

Answer 1

You can write a trivial implementation of javax.sql.ConnectionPoolDataSource that delegates to the javax.sql.DataSource implementation. Here is an example,
package example.datasource;
import java.sql.*;
import javax.sql.*;
public class HiveConnectionPoolDataSource extends org.apache.hive.jdbc.HiveDataSource implements ConnectionPoolDataSource {
public PooledConnection getPooledConnection() throws SQLException {
return new HivePooledConnection(null, null);
}
public PooledConnection getPooledConnection(String user, String password) throws SQLException {
return new HivePooledConnection(user, password);
}
public boolean isWrapperFor(Class<?> iface) throws SQLException {
return ConnectionPoolDataSource.class.equals(iface) || super.isWrapperFor(iface);
}
public <T> T unwrap(Class<T> iface) throws SQLException {
return ConnectionPoolDataSource.class.equals(iface) ? (T) this : super.unwrap(iface);
}
class HivePooledConnection implements PooledConnection {
private Connection con;
private final String user;
private final String password;
HivePooledConnection(String user, String password) {
this.user = user;
this.password = password;
}
public void addConnectionEventListener(ConnectionEventListener listener) {}
public void addStatementEventListener(StatementEventListener listener) {}
public void close() throws SQLException {
if (con != null) {
con.close();
con = null;
}
}
public Connection getConnection() throws SQLException {
if (con == null || con.isClosed()) {
con = user == null
? HiveConnectionPoolDataSource.this.getConnection()
: HiveConnectionPoolDataSource.this.getConnection(user, password);
return con;
} else
throw new IllegalStateException();
}
public void removeConnectionEventListener(ConnectionEventListener listener) {}
public void removeStatementEventListener(StatementEventListener listener) {}
}
}
Package your compiled class in a JAR alongside the JDBC driver JAR(s), and configure your custom JDBC provider in WebSphere Application Server to point at this JAR as though it were a part of the JDBC driver. Specify the implementation class name as example.datasource.HiveConnectionPoolDataSource or whatever package/name you chose for your own implementation. You should then be able to use the JDBC driver.
Also adding a link to the WebSphere Application Server request for enhancements page if anyone wants to request that support for javax.sql.DataSource be added.