main::java::lang::ClassNotFoundException

Java does not find a required class.

// Load Teradata JDBC driver
Class.forName("com.teradata.jdbc.TeraDriver");
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Are you sure that is sufficient? According to https://docs.oracle.com/javase%2F7%2Fdocs%2Fapi%2F%2F/java/lang/Class.html#forName(java.lang.String), this method may return a class object, but it does not initialize it. This method is documented to throw a ClassNotFoundException, so its parameter is likely to be the first problem. Java has no clue where to find the class file.

// Establish the connection
Connection connection = DriverManager.getConnection(jdbcUrl, username,
+ password);
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According to https://docs.oracle.com/javase/8/docs/api/java/sql/DriverManager.html#getConnection-java.lang.String-java.lang.String-java.lang.String-, this method does not throw a ClassNotFoundException. But:

The DriverManager attempts to select an appropriate driver from the set of registered JDBC drivers.

And that might be the second problem: The JDBC driver must somehow be registered. My guess is that that happens when the driver class is initialized, which does not happen in your code.

https://docs.oracle.com/javase/8/docs/api/java/sql/DriverManager.html#registerDriver-java.sql.Driver- explains:

Registers the given driver with the DriverManager. A newly-loaded driver class should call the method registerDriver to make itself known to the DriverManager.

Alexander