Unknown error on oracle connector (Debezium Server) after running ok

[Deukryong Moon]

Hi All, 

We started getting the following weird error since today. We are trying to trouble shoot but no luck so far. Anyone know what could cause this please?

Version : Debezium Server 3.2.0.Final

Connector : Oracle

Sink : RabbitMQ

2025-08-28 08:47:13,436 dcmidvmmox001 /opt/openjdk/jdk21.0.8/bin/java[20536] ERROR [io.deb.ser.ConnectorLifecycle] (pool-7-thread-1) Connector completed: success = 'false', message = 'org.apache.kafka.connect.errors.DataException: Invalid value: null used for required field: "schema", schema type: STRING', error = 'org.apache.kafka.connect.errors.DataException: Invalid value: null used for required field: "schema", schema type: STRING': org.apache.kafka.connect.errors.DataException: Invalid value: null used for required field: "schema", schema type: STRING
        at org.apache.kafka.connect.data.ConnectSchema.validateValue(ConnectSchema.java:224)
        at org.apache.kafka.connect.data.ConnectSchema.validateValue(ConnectSchema.java:217)
        at org.apache.kafka.connect.data.Struct.put(Struct.java:216)
        at org.apache.kafka.connect.data.Struct.put(Struct.java:203)
        at io.debezium.connector.oracle.OracleSourceInfoStructMaker.struct(OracleSourceInfoStructMaker.java:51)
        at io.debezium.connector.oracle.OracleSourceInfoStructMaker.struct(OracleSourceInfoStructMaker.java:15)
        at io.debezium.connector.AbstractSourceInfo.struct(AbstractSourceInfo.java:79)
        at io.debezium.pipeline.CommonOffsetContext.getSourceInfo(CommonOffsetContext.java:58)
        at io.debezium.connector.common.BaseSourceTask.validateSchemaHistory(BaseSourceTask.java:157)
        at io.debezium.connector.oracle.OracleConnectorTask.start(OracleConnectorTask.java:113)
        at io.debezium.connector.common.BaseSourceTask.start(BaseSourceTask.java:260)
        at io.debezium.embedded.async.AsyncEmbeddedEngine.lambda$startSourceTasks$2(AsyncEmbeddedEngine.java:429)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
        at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
        at java.base/java.lang.Thread.run(Thread.java:1583)

[Chris Cranford]

Hi -

This would indicate that there is some unexpected event in your schema history topic that does not contain a "schema" field in the event's "source" information block. Are you able to check the events in your schema history topic/file and see if you have any DDL changes that do not have a "schema" field in its "source" information block? If you're unsure how to check this, you're welcomed to zip up your history topic and attach it if you're using file-based schema history topic.

-cc

        at java.base/java.lang.Thread.run(Thread.java:1583) --
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