jdbc source sample changes

source-samples/jdbc-source/src/main/java/demo/SampleJdbcSource.java

@@ -52,6 +52,7 @@ import java.util.concurrent.TimeUnit;
 public class SampleJdbcSource {
 
 	public static void main(String... args){
+
 		SpringApplication.run(SampleJdbcSource.class, args);
 	}
 

source-samples/jdbc-source/src/main/resources/application.yml

@@ -8,4 +8,6 @@ jdbc:
   query: select id, name, tag from test order by id
   triggerDelay: 5
 spring.cloud.stream.bindings.output.destination: test-data
-spring.cloud.stream.bindings.input.destination: test-data
+spring.cloud.stream.bindings.input.destination: test-data
+
+spring.cloud.stream.default.producer.partitionKeyExpression: '#{0}'