Cannot sink Kafka stream to JDBC: unrecoverable exception - apache-kafka

Question

I'm trying to sink a stream of data from a MQTT Source with schema enabled to a Microsoft SQL Server database.
I've followed many posts on the matter, regardless I receive the following error:
org.apache.kafka.connect.errors.ConnectException: Exiting WorkerSinkTask due to unrecoverable exception.
at org.apache.kafka.connect.runtime.WorkerSinkTask.deliverMessages(WorkerSinkTask.java:484)
at org.apache.kafka.connect.runtime.WorkerSinkTask.poll(WorkerSinkTask.java:265)
at org.apache.kafka.connect.runtime.WorkerSinkTask.iteration(WorkerSinkTask.java:182)
at org.apache.kafka.connect.runtime.WorkerSinkTask.execute(WorkerSinkTask.java:150)
at org.apache.kafka.connect.runtime.WorkerTask.doRun(WorkerTask.java:146)
at org.apache.kafka.connect.runtime.WorkerTask.run(WorkerTask.java:190)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
The MQTT Source configuration is:
connector.class=com.datamountaineer.streamreactor.connect.mqtt.source.MqttSourceConnector
key.converter.schemas.enable=true
value.converter.schemas.enable=true
name=schema-mqtt-source
connect.mqtt.kcql=INSERT INTO schema_IoT SELECT * FROM machine/sensor/mytopic/test WITHCONVERTER=`com.datamountaineer.streamreactor.connect.converters.source.JsonSimpleConverter`
value.converter=org.apache.kafka.connect.json.JsonConverter
connect.mqtt.service.quality=0
key.converter=org.apache.kafka.connect.json.JsonConverter
connect.mqtt.hosts=tcp://host:1884
A data sample that is ingested into Kafka is the following:
{
"timestamp": 1526912884265,
"partition": 0,
"key": {
"schema": {
"type": "struct",
"fields": [
{
"type": "string",
"optional": false,
"field": "topic"
},
{
"type": "string",
"optional": false,
"field": "id"
}
],
"optional": false,
"name": "com.datamountaineer.streamreactor.connect.converters.MsgKey"
},
"payload": {
"topic": "machine/sensor/mytopic/test",
"id": "0"
}
},
"offset": 0,
"topic": "schema_IoT",
"value": {
"schema": {
"type": "struct",
"fields": [
{
"type": "int64",
"optional": false,
"field": "sentOn"
},
{
"type": "struct",
"fields": [
{
"type": "int64",
"optional": false,
"field": "fan"
},
{
"type": "int64",
"optional": false,
"field": "buzzer"
},
{
"type": "int64",
"optional": false,
"field": "light"
},
{
"type": "double",
"optional": false,
"field": "temperature"
},
{
"type": "string",
"optional": false,
"field": "assetName"
},
{
"type": "int64",
"optional": false,
"field": "led"
},
{
"type": "boolean",
"optional": false,
"field": "water"
}
],
"optional": false,
"name": "metrics",
"field": "metrics"
}
],
"optional": false,
"name": "machine_sensor_mytopic_test"
},
"payload": {
"sentOn": 1526913070679,
"metrics": {
"fan": 1,
"buzzer": 0,
"light": 255,
"temperature": 22.296352538102642,
"assetName": "SIMopcua",
"led": 0,
"water": false
}
}
}
}
Finally the properties of the jdbc-sink connector config. file are:
connector.class=io.confluent.connect.jdbc.JdbcSinkConnector
connection.password=password
topics=schema_IoT
batch.size=10
key.converter.schemas.enable=true
auto.evolve=true
connection.user=username
name=sink-mssql
value.converter.schemas.enable=true
auto.create=true
connection.url=jdbc:sqlserver://hostname:port;databaseName=mydb;user=username;password=mypsd;
value.converter=org.apache.kafka.connect.json.JsonConverter
insert.mode=insert
key.converter=org.apache.kafka.connect.json.JsonConverter
What am I doing wrong? Any help is appreciated.
Fabio