Support fallback URL properties

Update `DataSourceBuilder` so that the url property attempts both
`getUrl()` / `setUrl(...)` and `getURL()`/`setURL(...)`.

Fixes gh-26647

Co-authored-by: Phillip Webb <pwebb@vmware.com>

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jdbc/DataSourceBuilder.java

@@ -251,31 +251,42 @@ public final class DataSourceBuilder<T extends DataSource> {
 	 */
 	private enum DataSourceProperty {
 
-		URL("url"),
+		URL("url", "URL"),
 
 		DRIVER_CLASS_NAME("driverClassName"),
 
-		USERNAME("username"),
+		USERNAME("username", "user"),
 
 		PASSWORD("password");
 
-		private final String name;
+		private final String[] names;
 
-		DataSourceProperty(String name) {
+		DataSourceProperty(String... names) {
-			this.name = name;
+			this.names = names;
 		}
 
 		@Override
 		public String toString() {
-			return this.name;
+			return this.names[0];
 		}
 
 		Method findSetter(Class<?> type) {
-			return ReflectionUtils.findMethod(type, "set" + StringUtils.capitalize(this.name), String.class);
+			return extracted("set", type);
 		}
 
 		Method findGetter(Class<?> type) {
-			return ReflectionUtils.findMethod(type, "get" + StringUtils.capitalize(this.name), String.class);
+			return extracted("get", type);
+		}
+
+		private Method extracted(String prefix, Class<?> type) {
+			for (String candidate : this.names) {
+				Method method = ReflectionUtils.findMethod(type, prefix + StringUtils.capitalize(candidate),
+						String.class);
+				if (method != null) {
+					return method;
+				}
+			}
+			return null;
 		}
 
 	}

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/jdbc/DataSourceBuilderTests.java

@@ -26,6 +26,7 @@ import java.util.Arrays;
 
 import javax.sql.DataSource;
 
+import com.microsoft.sqlserver.jdbc.SQLServerDataSource;
 import com.zaxxer.hikari.HikariDataSource;
 import oracle.jdbc.internal.OpaqueString;
 import oracle.jdbc.pool.OracleDataSource;
@@ -148,6 +149,15 @@ class DataSourceBuilderTests {
 		assertThat(pgDataSource.getUser()).isEqualTo("test");
 	}
 
+	@Test // gh-26647
+	void buildWhenSqlServerTypeSpecifiedReturnsExpectedDataSource() {
+		this.dataSource = DataSourceBuilder.create().url("jdbc:sqlserver://localhost/test")
+				.type(SQLServerDataSource.class).username("test").build();
+		assertThat(this.dataSource).isInstanceOf(SQLServerDataSource.class);
+		SQLServerDataSource sqlServerDataSource = (SQLServerDataSource) this.dataSource;
+		assertThat(sqlServerDataSource.getUser()).isEqualTo("test");
+	}
+
 	@Test
 	void buildWhenMappedTypeSpecifiedAndNoSuitableMappingThrowsException() {
 		assertThatExceptionOfType(UnsupportedDataSourcePropertyException.class).isThrownBy(