Added posgrest dependencies

Code cleanup

dataflow-website/batch-developer-guides/batch/batchsamples/billrun/pom.xml

@@ -56,6 +56,10 @@
 			<artifactId>mysql-connector-java</artifactId>
 			<scope>runtime</scope>
 		</dependency>
+		<dependency>
+			<groupId>org.postgresql</groupId>
+			<artifactId>postgresql</artifactId>
+		</dependency>
 	</dependencies>
 
 </project>

dataflow-website/batch-developer-guides/batch/batchsamples/billrun/src/main/java/io/spring/billrun/configuration/BillingConfiguration.java

@@ -49,8 +49,6 @@ import org.springframework.core.io.Resource;
 @EnableTask
 @EnableBatchProcessing
 public class BillingConfiguration {
-	private static final Log logger = LogFactory.getLog(BillingConfiguration.class);
-
 	@Autowired
 	public JobBuilderFactory jobBuilderFactory;
 

dataflow-website/batch-developer-guides/batch/batchsamples/billrun/src/test/java/io/spring/billrun/BillrunApplicationTests.java

@@ -3,7 +3,6 @@ package io.spring.billrun;
 import java.util.List;
 
 import io.spring.billrun.model.Bill;
-import io.spring.billrun.model.Usage;
 import javax.sql.DataSource;
 import org.junit.Before;
 import org.junit.Test;

dataflow-website/batch-developer-guides/batch/batchsamples/billsetuptask/pom.xml

@@ -36,6 +36,10 @@
 			<artifactId>mysql-connector-java</artifactId>
 			<scope>runtime</scope>
 		</dependency>
+		<dependency>
+			<groupId>org.postgresql</groupId>
+			<artifactId>postgresql</artifactId>
+		</dependency>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-test</artifactId>