Configuration of DBZ is :

{
"name": "oracle",
"config":

{ "connector.class":"io.debezium.connector.oracle.OracleConnector", "tasks.max":"1", "database.server.name": "oracle", "database.hostname": "xx.x.xx.xx", "database.port": "1521", "database.user": "dbzuser", "database.password": "dbzuser", "database.dbname": "testogg", "database.history.kafka.topic": "oracle-history", "database.history.kafka.bootstrap.servers": "xx.x.xxx.xx:9092", "database.history.skip.unparseable.ddl": "true", "database.history.store.only.captured.tables.ddl": "true", "table.include.list": "SCOTT.T_DBZ_TEST1", "tombstones.on.delete": "false", "decimal.handling.mode": "string", "lob.enabled": "false" }

}

 
Table like that:
CREATE TABLE SCOTT.T_DBZ_TEST1(
ID NUMBER(10) NOT NULL,
T_CHAR CHAR(100),
T_VARCHAR VARCHAR2(100),
T_NUMBER NUMBER(10),
T_BLOB BLOB,
T_DATE DATE DEFAULT SYSDATE,
T_TIMESTAMP TIMESTAMP,
T_CLOB CLOB,
T_DECIMAL NUMBER(10, 2),
T_NVARCHAR2 NVARCHAR2(10),
T_FLOAT FLOAT,
PRIMARY KEY (ID)
);

Start the DBZ connector, a few minutes the status occur log:
org.apache.kafka.connect.errors.ConnectException: An exception occurred in the change event producer. This connector will be stopped.
at io.debezium.pipeline.ErrorHandler.setProducerThrowable(ErrorHandler.java:42)
at io.debezium.connector.oracle.logminer.LogMinerStreamingChangeEventSource.execute(LogMinerStreamingChangeEventSource.java:180)
at io.debezium.connector.oracle.logminer.LogMinerStreamingChangeEventSource.execute(LogMinerStreamingChangeEventSource.java:58)
at io.debezium.pipeline.ChangeEventSourceCoordinator.streamEvents(ChangeEventSourceCoordinator.java:166)
at io.debezium.pipeline.ChangeEventSourceCoordinator.lambda$start$0(ChangeEventSourceCoordinator.java:127)
at java.util.concurrent.Executors$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$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.kafka.connect.errors.SchemaBuilderException: Invalid default value
at org.apache.kafka.connect.data.SchemaBuilder.defaultValue(SchemaBuilder.java:131)
at io.debezium.relational.TableSchemaBuilder.addField(TableSchemaBuilder.java:380)
at io.debezium.relational.TableSchemaBuilder.lambda$create$2(TableSchemaBuilder.java:122)
at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1384)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
at io.debezium.relational.TableSchemaBuilder.create(TableSchemaBuilder.java:120)
at io.debezium.relational.RelationalDatabaseSchema.buildAndRegisterSchema(RelationalDatabaseSchema.java:135)
at io.debezium.connector.oracle.OracleDatabaseSchema.lambda$applySchemaChange$0(OracleDatabaseSchema.java:80)
at java.lang.Iterable.forEach(Iterable.java:75)
at io.debezium.connector.oracle.OracleDatabaseSchema.applySchemaChange(OracleDatabaseSchema.java:79)
at io.debezium.pipeline.EventDispatcher$SchemaChangeEventReceiver.schemaChangeEvent(EventDispatcher.java:539)
at io.debezium.connector.oracle.OracleSchemaChangeEventEmitter.emitSchemaChangeEvent(OracleSchemaChangeEventEmitter.java:116)
at io.debezium.pipeline.EventDispatcher.dispatchSchemaChangeEvent(EventDispatcher.java:305)
at io.debezium.connector.oracle.logminer.processor.AbstractLogMinerEventProcessor.dispatchSchemaChangeEventAndGetTableForNewCapturedTable(AbstractLogMinerEventProcessor.java:525)
at io.debezium.connector.oracle.logminer.processor.AbstractLogMinerEventProcessor.getTableForDataEvent(AbstractLogMinerEventProcessor.java:459)
at io.debezium.connector.oracle.logminer.processor.AbstractLogMinerEventProcessor.handleDataEvent(AbstractLogMinerEventProcessor.java:394)
at io.debezium.connector.oracle.logminer.processor.AbstractLogMinerEventProcessor.processRow(AbstractLogMinerEventProcessor.java:203)
at io.debezium.connector.oracle.logminer.processor.AbstractLogMinerEventProcessor.processResults(AbstractLogMinerEventProcessor.java:161)
at io.debezium.connector.oracle.logminer.processor.memory.MemoryLogMinerEventProcessor.process(MemoryLogMinerEventProcessor.java:116)
at io.debezium.connector.oracle.logminer.LogMinerStreamingChangeEventSource.execute(LogMinerStreamingChangeEventSource.java:167)

Caused by: org.apache.kafka.connect.errors.DataException: Invalid Java object for schema type INT64: class java.lang.String for field: \"null\"
at org.apache.kafka.connect.data.ConnectSchema.validateValue(ConnectSchema.java:244)
at org.apache.kafka.connect.data.ConnectSchema.validateValue(ConnectSchema.java:213)
at org.apache.kafka.connect.data.SchemaBuilder.defaultValue(SchemaBuilder.java:129)