Detect AbstractDataSourceInitializers as DB initializers

See gh-27215

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

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2021 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.jdbc;
+
+import java.util.Collections;
+import java.util.Set;
+
+import org.springframework.boot.sql.init.dependency.AbstractBeansOfTypeDatabaseInitializerDetector;
+import org.springframework.boot.sql.init.dependency.DatabaseInitializerDetector;
+
+/**
+ * A {@link DatabaseInitializerDetector} for {@link AbstractDataSourceInitializer}.
+ *
+ * @author Henning Pöttker
+ */
+class AbstractDataSourceInitializerDatabaseInitializerDetector extends AbstractBeansOfTypeDatabaseInitializerDetector {
+
+	@Override
+	protected Set<Class<?>> getDatabaseInitializerBeanTypes() {
+		return Collections.singleton(AbstractDataSourceInitializer.class);
+	}
+
+	@Override
+	public int getOrder() {
+		return 1;
+	}
+
+}

spring-boot-project/spring-boot/src/main/resources/META-INF/spring.factories

@@ -85,7 +85,8 @@ org.springframework.boot.flyway.FlywayDatabaseInitializerDetector,\
 org.springframework.boot.jdbc.init.DataSourceScriptDatabaseInitializerDetector,\
 org.springframework.boot.liquibase.LiquibaseDatabaseInitializerDetector,\
 org.springframework.boot.orm.jpa.JpaDatabaseInitializerDetector,\
-org.springframework.boot.r2dbc.init.R2dbcScriptDatabaseInitializerDetector
+org.springframework.boot.r2dbc.init.R2dbcScriptDatabaseInitializerDetector,\
+org.springframework.boot.jdbc.AbstractDataSourceInitializerDatabaseInitializerDetector
 
 # Depends On Database Initialization Detectors
 org.springframework.boot.sql.init.dependency.DependsOnDatabaseInitializationDetector=\