Polish

See gh-23693

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

@@ -139,7 +139,7 @@ public enum EmbeddedDatabaseConnection {
 	 * database type.
 	 * @param driverClass the driver class
 	 * @return true if the driver class is one of the embedded types
-	 * @deprecated since 2.4.0 in favor of {@link #isEmbedded(String, String)}
+	 * @deprecated since 2.3.5 in favor of {@link #isEmbedded(String, String)}
 	 */
 	@Deprecated
 	public static boolean isEmbedded(String driverClass) {
@@ -154,7 +154,14 @@ public enum EmbeddedDatabaseConnection {
 	 * @return true if the driver class and url refer to an embedded database
 	 */
 	public static boolean isEmbedded(String driverClass, String url) {
-		return driverClass != null && getEmbeddedDatabaseConnection(driverClass).isEmbeddedUrl(url);
+		if (driverClass == null) {
+			return false;
+		}
+		EmbeddedDatabaseConnection connection = getEmbeddedDatabaseConnection(driverClass);
+		if (connection == NONE) {
+			return false;
+		}
+		return (url == null || connection.isEmbeddedUrl(url));
 	}
 
 	private static EmbeddedDatabaseConnection getEmbeddedDatabaseConnection(String driverClass) {

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

@@ -92,18 +92,27 @@ class EmbeddedDatabaseConnectionTests {
 				.withMessageContaining("DatabaseName must not be empty");
 	}
 
-	@ParameterizedTest(name = "{1}")
+	@ParameterizedTest(name = "{0} - {1}")
 	@MethodSource("embeddedDriverAndUrlParameters")
-	void isEmbeddedWithDriverAndUrl(EmbeddedDatabaseConnection connection, String url, boolean embedded) {
-		assertThat(EmbeddedDatabaseConnection.isEmbedded(connection.getDriverClassName(), url)).isEqualTo(embedded);
+	void isEmbeddedWithDriverAndUrl(String driverClassName, String url, boolean embedded) {
+		assertThat(EmbeddedDatabaseConnection.isEmbedded(driverClassName, url)).isEqualTo(embedded);
 	}
 
 	static Object[] embeddedDriverAndUrlParameters() {
-		return new Object[] { new Object[] { EmbeddedDatabaseConnection.H2, "jdbc:h2:~/test", false },
-				new Object[] { EmbeddedDatabaseConnection.H2, "jdbc:h2:mem:test;DB_CLOSE_DELAY=-1", true },
-				new Object[] { EmbeddedDatabaseConnection.HSQLDB, "jdbc:hsqldb:hsql://localhost", false },
-				new Object[] { EmbeddedDatabaseConnection.HSQLDB, "jdbc:hsqldb:mem:test", true },
-				new Object[] { EmbeddedDatabaseConnection.DERBY, "jdbc:derby:memory:test", true } };
+		return new Object[] {
+				new Object[] { EmbeddedDatabaseConnection.H2.getDriverClassName(), "jdbc:h2:~/test", false },
+				new Object[] { EmbeddedDatabaseConnection.H2.getDriverClassName(), "jdbc:h2:mem:test;DB_CLOSE_DELAY=-1",
+						true },
+				new Object[] { EmbeddedDatabaseConnection.H2.getDriverClassName(), null, true },
+				new Object[] { EmbeddedDatabaseConnection.HSQLDB.getDriverClassName(), "jdbc:hsqldb:hsql://localhost",
+						false },
+				new Object[] { EmbeddedDatabaseConnection.HSQLDB.getDriverClassName(), "jdbc:hsqldb:mem:test", true },
+				new Object[] { EmbeddedDatabaseConnection.HSQLDB.getDriverClassName(), null, true },
+				new Object[] { EmbeddedDatabaseConnection.DERBY.getDriverClassName(), "jdbc:derby:memory:test", true },
+				new Object[] { EmbeddedDatabaseConnection.DERBY.getDriverClassName(), null, true },
+				new Object[] { "com.mysql.cj.jdbc.Driver", "jdbc:mysql:mem:test", false },
+				new Object[] { "com.mysql.cj.jdbc.Driver", null, false },
+				new Object[] { null, "jdbc:none:mem:test", false }, new Object[] { null, null, false } };
 	}
 
 	@Test