DATAJDBC-573 - Polishing.

Remove unused imports, reformat code. Tweak logging.

Original pull request: #237.

spring-data-jdbc/src/test/java/org/springframework/data/jdbc/testing/DataSourceConfiguration.java

@@ -15,26 +15,26 @@
  */
 package org.springframework.data.jdbc.testing;
 
+import static org.awaitility.pollinterval.FibonacciPollInterval.*;
+
+import java.sql.Connection;
+import java.util.concurrent.TimeUnit;
+
 import javax.sql.DataSource;
 
 import org.awaitility.Awaitility;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.env.Environment;
 import org.springframework.core.io.ClassPathResource;
-import org.springframework.jdbc.datasource.DriverManagerDataSource;
 import org.springframework.jdbc.datasource.init.DataSourceInitializer;
 import org.springframework.jdbc.datasource.init.ResourceDatabasePopulator;
 
-import java.sql.Connection;
-import java.util.concurrent.TimeUnit;
-
-import static org.awaitility.pollinterval.FibonacciPollInterval.*;
-
 /**
  * Basic configuration expecting subclasses to provide a {@link DataSource} via {@link #createDataSource()} to be
  * exposed to the {@link ApplicationContext}.
@@ -47,7 +47,6 @@ abstract class DataSourceConfiguration {
 
 	private static final Logger LOG = LoggerFactory.getLogger(DataSourceConfiguration.class);
 
-
 	@Autowired Class<?> testClass;
 	@Autowired Environment environment;
 
@@ -99,12 +98,15 @@ abstract class DataSourceConfiguration {
 				.ignoreExceptions() //
 				.until(() -> {
 
-					LOG.debug("connectivity verifying ...");
+					if (LOG.isDebugEnabled()) {
+						LOG.debug(String.format("Verifying connectivity to %s...", dataSource));
+					}
+
 					try (Connection connection = dataSource.getConnection()) {
 						return true;
 					}
 				});
 
-		LOG.info("connectivity verified");
+		LOG.info("Connectivity verified");
 	}
 }

spring-data-jdbc/src/test/java/org/springframework/data/jdbc/testing/Db2DataSourceConfiguration.java

@@ -15,15 +15,10 @@
  */
 package org.springframework.data.jdbc.testing;
 
-import java.sql.Connection;
-import java.sql.SQLException;
-import java.util.concurrent.TimeUnit;
-
 import javax.sql.DataSource;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.awaitility.Awaitility;
 
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Profile;
@@ -32,8 +27,6 @@ import org.springframework.jdbc.datasource.init.ResourceDatabasePopulator;
 
 import org.testcontainers.containers.Db2Container;
 
-import static org.awaitility.pollinterval.FibonacciPollInterval.*;
-
 /**
  * {@link DataSource} setup for DB2.
  *
@@ -65,10 +58,8 @@ class Db2DataSourceConfiguration extends DataSourceConfiguration {
 			DB_2_CONTAINER = container;
 		}
 
-		DriverManagerDataSource dataSource = new DriverManagerDataSource(DB_2_CONTAINER.getJdbcUrl(),
+		return new DriverManagerDataSource(DB_2_CONTAINER.getJdbcUrl(),
 				DB_2_CONTAINER.getUsername(), DB_2_CONTAINER.getPassword());
-
-		return dataSource;
 	}
 
 	/*

spring-data-jdbc/src/test/java/org/springframework/data/jdbc/testing/OracleDataSourceConfiguration.java

@@ -62,10 +62,7 @@ public class OracleDataSourceConfiguration extends DataSourceConfiguration {
 
 		String jdbcUrl = ORACLE_CONTAINER.getJdbcUrl().replace(":xe", "/XEPDB1");
 
-		DataSource dataSource = new DriverManagerDataSource(jdbcUrl, ORACLE_CONTAINER.getUsername(),
-				ORACLE_CONTAINER.getPassword());
-
-		return dataSource;
+		return new DriverManagerDataSource(jdbcUrl, ORACLE_CONTAINER.getUsername(), ORACLE_CONTAINER.getPassword());
 	}
 
 	@Override