Tolerate Flyway 9

Closes gh-32034

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/flyway/FlywayAutoConfiguration.java

@@ -261,10 +261,15 @@ private void configureProperties(FluentConfiguration configuration, FlywayProper
 		@SuppressWarnings("deprecation")
 		private void configureIgnoredMigrations(FluentConfiguration configuration, FlywayProperties properties,
 				PropertyMapper map) {
-			map.from(properties.isIgnoreMissingMigrations()).to(configuration::ignoreMissingMigrations);
-			map.from(properties.isIgnoreIgnoredMigrations()).to(configuration::ignoreIgnoredMigrations);
-			map.from(properties.isIgnorePendingMigrations()).to(configuration::ignorePendingMigrations);
-			map.from(properties.isIgnoreFutureMigrations()).to(configuration::ignoreFutureMigrations);
+			try {
+				map.from(properties.isIgnoreMissingMigrations()).to(configuration::ignoreMissingMigrations);
+				map.from(properties.isIgnoreIgnoredMigrations()).to(configuration::ignoreIgnoredMigrations);
+				map.from(properties.isIgnorePendingMigrations()).to(configuration::ignorePendingMigrations);
+				map.from(properties.isIgnoreFutureMigrations()).to(configuration::ignoreFutureMigrations);
+			}
+			catch (BootstrapMethodError ex) {
+				// Flyway 9+
+			}
 		}
 
 		private void configureFailOnMissingLocations(FluentConfiguration configuration,

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/flyway/Flyway9xAutoConfigurationTests.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright 2012-2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.flyway;
+
+import org.flywaydb.core.Flyway;
+import org.flywaydb.core.api.Location;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.autoconfigure.jdbc.EmbeddedDataSourceConfiguration;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+import org.springframework.boot.testsupport.classpath.ClassPathOverrides;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link FlywayAutoConfiguration} with Flyway 9.x.
+ *
+ * @author Andy Wilkinson
+ */
+@ClassPathOverrides({ "org.flywaydb:flyway-core:9.1.2", "com.h2database:h2:2.1.210" })
+class Flyway9xAutoConfigurationTests {
+
+	private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
+			.withConfiguration(AutoConfigurations.of(FlywayAutoConfiguration.class))
+			.withPropertyValues("spring.datasource.generate-unique-name=true");
+
+	@Test
+	void defaultFlyway() {
+		this.contextRunner.withUserConfiguration(EmbeddedDataSourceConfiguration.class).run((context) -> {
+			assertThat(context).hasSingleBean(Flyway.class);
+			Flyway flyway = context.getBean(Flyway.class);
+			assertThat(flyway.getConfiguration().getLocations())
+					.containsExactly(new Location("classpath:db/migration"));
+		});
+	}
+
+}