Ensure JdbcTemplate and DB initializer still work when user supplies DataSource

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jdbc/DataSourceAutoConfiguration.java

@@ -64,7 +64,6 @@ import org.springframework.util.StringUtils;
  */
 @Configuration
 @ConditionalOnClass(EmbeddedDatabaseType.class /* Spring JDBC */)
-@ConditionalOnMissingBean(DataSource.class)
 public class DataSourceAutoConfiguration implements EnvironmentAware {
 
 	private static Log logger = LogFactory.getLog(DataSourceAutoConfiguration.class);
@@ -138,16 +137,19 @@ public class DataSourceAutoConfiguration implements EnvironmentAware {
 	}
 
 	@Conditional(DataSourceAutoConfiguration.EmbeddedDatabaseCondition.class)
+	@ConditionalOnMissingBean(DataSource.class)
 	@Import(EmbeddedDataSourceConfiguration.class)
 	protected static class EmbeddedConfiguration {
 	}
 
 	@Conditional(DataSourceAutoConfiguration.TomcatDatabaseCondition.class)
+	@ConditionalOnMissingBean(DataSource.class)
 	@Import(TomcatDataSourceConfiguration.class)
 	protected static class TomcatConfiguration {
 	}
 
 	@Conditional(DataSourceAutoConfiguration.BasicDatabaseCondition.class)
+	@ConditionalOnMissingBean(DataSource.class)
 	@Import(CommonsDataSourceConfiguration.class)
 	protected static class DbcpConfiguration {
 	}

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jdbc/DataSourceAutoConfigurationTests.java

@@ -75,6 +75,17 @@ public class DataSourceAutoConfigurationTests {
 		assertNotNull(jdbcTemplate.getDataSource());
 	}
 
+	@Test
+	public void testJdbcTemplateExistsWithCustomDataSource() throws Exception {
+		this.context.register(TestDataSourceConfiguration.class,
+				DataSourceAutoConfiguration.class,
+				PropertyPlaceholderAutoConfiguration.class);
+		this.context.refresh();
+		JdbcTemplate jdbcTemplate = this.context.getBean(JdbcTemplate.class);
+		assertNotNull(jdbcTemplate);
+		assertTrue(jdbcTemplate.getDataSource() instanceof BasicDataSource);
+	}
+
 	@Test
 	public void testNamedParameterJdbcTemplateExists() throws Exception {
 		this.context.register(DataSourceAutoConfiguration.class,