JDBC Teradata Sink: How to insert null values - jdbc

Question

I am trying to insert data from Kafka to Teradata. The payload has some null values, and the JDBC sink is throwing the following error.
[Teradata JDBC Driver] [TeraJDBC 16.20.00.10] [Error 1063] [SQLState HY000] null is not supported as a data value with this variant of the setObject method; use the setNull method or the setObject method with a targetSqlType parameter
My connector config:
name=teradata-sink-K_C_OSUSR_DGL_DFORM_I1-V2
connector.class=io.confluent.connect.jdbc.JdbcSinkConnector
tasks.max=1
connection.url=connectionString
topics=POPS-P-OSUSR_DGL_DFORM_I1-J-V2-CAL-OUT
topic.prefix=
table.name.format=K_C_OSUSR_DGL_DFORM_I1_V2
batch.size=50000
errors.tolerance=all
errors.deadletterqueue.topic.name=POPS-P-OSUSR_DGL_DFORM_I1-V2-CAL-DEAD
errors.deadletterqueue.topic.replication.factor=1
Is there a way to achieve this? I do not know if I have to change some code into the sink or just change the connector config.

Answer 1

You are getting the error from some line that surely look like this:
ps.setObject(1, val);
This one will throw an exception if the val you try to insert has a null value.
The error is telling that you must specify the data type of the null values incoming. You could do this:
ps.setObject(1, val, Types.VARCHAR);
This way you are casting NULL to a VARCHAR, one of the supported targetSqlTypes.
Another option for the same purpose:
ps.setNull(1, Types.VARCHAR) ;

Answer 2

The problem we have is we are using the standard Kafka Connect to create a sink (we are not coding any custom connector).
We have configured both .properties files for worker and connector to create a link between the topic and the teradata table, and we run it using
.../confluent/bin/connect-standalone <worker.cfg> <connector.cfg>
When we create a message with "null" values and send it into the topic, the Sink Connector is unable to insert the record into the TD table.