Make DB init back off without DatabasePopulator

Fixes gh-26850

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/sql/init/DataSourceInitializationConfiguration.java

@@ -18,6 +18,7 @@ package org.springframework.boot.autoconfigure.sql.init;
 
 import javax.sql.DataSource;
 
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnSingleCandidate;
 import org.springframework.boot.jdbc.DataSourceBuilder;
@@ -27,11 +28,13 @@ import org.springframework.boot.sql.init.DatabaseInitializationSettings;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.jdbc.datasource.SimpleDriverDataSource;
+import org.springframework.jdbc.datasource.init.DatabasePopulator;
 import org.springframework.util.StringUtils;
 
 @Configuration(proxyBeanMethods = false)
 @ConditionalOnMissingBean(AbstractScriptDatabaseInitializer.class)
 @ConditionalOnSingleCandidate(DataSource.class)
+@ConditionalOnClass(DatabasePopulator.class)
 class DataSourceInitializationConfiguration {
 
 	@Bean

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/sql/init/R2dbcInitializationConfiguration.java

@@ -25,6 +25,7 @@ import org.springframework.boot.r2dbc.init.R2dbcScriptDatabaseInitializer;
 import org.springframework.boot.sql.init.DatabaseInitializationSettings;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.r2dbc.connection.init.DatabasePopulator;
 import org.springframework.util.StringUtils;
 
 /**
@@ -34,7 +35,7 @@ import org.springframework.util.StringUtils;
  * @author Andy Wilkinson
  */
 @Configuration(proxyBeanMethods = false)
-@ConditionalOnClass(ConnectionFactory.class)
+@ConditionalOnClass({ ConnectionFactory.class, DatabasePopulator.class })
 @ConditionalOnSingleCandidate(ConnectionFactory.class)
 class R2dbcInitializationConfiguration {
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/sql/init/SqlInitializationAutoConfigurationTests.java

@@ -35,10 +35,12 @@ import org.springframework.boot.r2dbc.init.R2dbcScriptDatabaseInitializer;
 import org.springframework.boot.sql.init.AbstractScriptDatabaseInitializer;
 import org.springframework.boot.sql.init.DatabaseInitializationSettings;
 import org.springframework.boot.sql.init.dependency.DependsOnDatabaseInitialization;
+import org.springframework.boot.test.context.FilteredClassLoader;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.io.Resource;
+import org.springframework.jdbc.datasource.init.DatabasePopulator;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -141,6 +143,26 @@ public class SqlInitializationAutoConfigurationTests {
 				});
 	}
 
+	@Test
+	void whenADataSourceIsAvailableAndSpringJdbcIsNotThenAutoConfigurationBacksOff() {
+		this.contextRunner.withConfiguration(AutoConfigurations.of(DataSourceAutoConfiguration.class))
+				.withClassLoader(new FilteredClassLoader(DatabasePopulator.class)).run((context) -> {
+					assertThat(context).hasSingleBean(DataSource.class);
+					assertThat(context).doesNotHaveBean(AbstractScriptDatabaseInitializer.class);
+				});
+	}
+
+	@Test
+	void whenAConnectionFactoryIsAvailableAndSpringR2dbcIsNotThenAutoConfigurationBacksOff() {
+		this.contextRunner.withConfiguration(AutoConfigurations.of(R2dbcAutoConfiguration.class))
+				.withClassLoader(
+						new FilteredClassLoader(org.springframework.r2dbc.connection.init.DatabasePopulator.class))
+				.run((context) -> {
+					assertThat(context).hasSingleBean(ConnectionFactory.class);
+					assertThat(context).doesNotHaveBean(AbstractScriptDatabaseInitializer.class);
+				});
+	}
+
 	@Configuration(proxyBeanMethods = false)
 	static class DatabaseInitializerConfiguration {