JDBC Source -> JDBC Sink binding errors - spring-cloud-dataflow

Question

I am trying to establish a JDBC (Postgres) Source to Snowflake (JDBC compliant) Sink pipeline.
In order to integrate Snowflake I needed to patch the OOB JDBC Sink app according to the guide https://docs.spring.io/spring-cloud-stream-app-starters/docs/Einstein.SR6/reference/htmlsingle/#_patching_pre_built_applications
Which I did and registered on my local SCDF stack.
However I do have "binding errors" at the Sink side of this simple equation.
The stacktrace is:
2020-06-22 13:19:15.762 INFO 17866 --- [container-0-C-1] o.a.k.c.consumer.internals.Fetcher : [Consumer clientId=consumer-3, groupId=poc-stream-CCABUxRjhfLYIJvcqdRl] Resetting offset for partition poc-stream-CCABUxRjhfLYIJvcqdRl.source-0 to offset 0.
2020-06-22 13:19:15.767 INFO 17866 --- [container-0-C-1] o.s.c.s.b.k.KafkaMessageChannelBinder$1 : partitions assigned: [poc-stream-CCABUxRjhfLYIJvcqdRl.source-0]
2020-06-22 13:19:15.774 INFO 17866 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 28782 (http) with context path ''
2020-06-22 13:19:15.775 INFO 17866 --- [ main] c.u.p.s.s.SnowflakeSinkApplication : Started SnowflakeSinkApplication in 10.866 seconds (JVM running for 11.581)
2020-06-22 13:19:51.914 WARN 17866 --- [container-0-C-1] com.zaxxer.hikari.pool.ProxyConnection : HikariPool-1 - Connection net.snowflake.client.jdbc.SnowflakeConnectionV1#5b8398d7 marked as broken because of SQLSTATE(0A000), ErrorCode(200018)
net.snowflake.client.jdbc.SnowflakeSQLException: **Data type not supported for binding: Object type: class [B.** at net.snowflake.client.jdbc.SnowflakePreparedStatementV1.setObject(SnowflakePreparedStatementV1.java:526) ~[snowflake-jdbc-3.12.7.jar!/:3.12.7]
at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.setObject(HikariProxyPreparedStatement.java) ~[HikariCP-3.2.0.jar!/:na]
Here is my Stream definition:
source: jdbc --trigger.time-unit=SECONDS --spring.datasource.username='' --trigger.fixed-delay=1 --spring.datasource.url='' --jdbc.query='SELECT * FROM public.source_table_1 WHERE active=false' --jdbc.update='UPDATE public.source_table_1 SET active=true WHERE id in (:id)' --spring.cloud.stream.bindings.output.contentType=text/plain --spring.datasource.password='*****' | snowflake-sink --jdbc.columns=id:payload,first_name:payload,last_name:payload --spring.datasource.driver-class-name=net.snowflake.client.jdbc.SnowflakeDriver --spring.cloud.stream.bindings.input.contentType=text/plain --jdbc.table-name=target_table_1*
Chaning the jdbc.columns as:
--jdbc.columns=id,first_name,last_name
did not help either.
My target table at SnowFlake:
CREATE TABLE target_table_1 (
id bigint NOT NULL,
first_name varchar,
last_name varchar,
primary key (id)
)
Source table DDL is the same
Any help/pointers are appreciated.

Answer 1

Replying to myself might also be useful for the others in the universe:
Added contentType property for both source and sink. Also declared the jdbc.columns property as shown below (as opposed to the ref. guide - https://github.com/spring-cloud-stream-app-starters/jdbc/tree/master/spring-cloud-starter-stream-sink-jdbc
#Bean
public StreamApplication jdbcSource() {
return new StreamApplication("source: jdbc")
.addProperties(Map.of("jdbc.query", "'SELECT * FROM public.source_table_1 WHERE imported=false'"))
.addProperties(Map.of("jdbc.update", "'UPDATE public.source_table_1 SET imported=true WHERE id in (:id)'"))
.addProperties(Map.of("spring.datasource.username", "postgres"))
.addProperties(Map.of("spring.datasource.password", "mysecretpassword"))
.addProperties(Map.of("spring.datasource.url", "'jdbc:postgresql://localhost:5432/content_types'"))
.addProperties(Map.of("trigger.time-unit", "SECONDS"))
.addProperties(Map.of("trigger.fixed-delay", "1"))
.addProperties(Map.of("spring.cloud.stream.bindings.output.contentType", "application/json"));
}
#Bean
public StreamApplication sfSink() {
return new StreamApplication("snowflake-sink")
.addProperties(Map.of("jdbc.table-name", "target_table_1"))
.addProperties(Map.of("jdbc.initialize", "true"))
.addProperties(Map.of("spring.cloud.stream.bindings.input.contentType", "application/json"))
.addProperties(Map.of("jdbc.columns", "'id:new String(payload).id,first_name:new String(payload).first_name,last_name:new String(payload).last_name'"))
.addProperties(Map.of("spring.datasource.driver-class-name", "net.snowflake.client.jdbc.SnowflakeDriver"));
}