/*
 * Copyright 2012-2019 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.liquibase;

import liquibase.servicelocator.CustomResolverServiceLocator;
import liquibase.servicelocator.ServiceLocator;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.boot.context.event.ApplicationStartingEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.util.ClassUtils;

/**
 * {@link ApplicationListener} that replaces the liquibase {@link ServiceLocator} with a
 * version that works with Spring Boot executable archives.
 *
 * @author Phillip Webb
 * @author Dave Syer
 * @since 1.0.0
 */
public class LiquibaseServiceLocatorApplicationListener implements ApplicationListener<ApplicationStartingEvent> {

	private static final Log logger = LogFactory.getLog(LiquibaseServiceLocatorApplicationListener.class);

	@Override
	public void onApplicationEvent(ApplicationStartingEvent event) {
		if (ClassUtils.isPresent("liquibase.servicelocator.CustomResolverServiceLocator",
				event.getSpringApplication().getClassLoader())) {
			new LiquibasePresent().replaceServiceLocator();
		}
	}

	/**
	 * Inner class to prevent class not found issues.
	 */
	private static class LiquibasePresent {

		void replaceServiceLocator() {
			CustomResolverServiceLocator customResolverServiceLocator = new CustomResolverServiceLocator(
					new SpringPackageScanClassResolver(logger));
			ServiceLocator.setInstance(customResolverServiceLocator);
		}

	}

}

@@ -20,10 +20,10 @@
 2-20
-19
+20
  the
@@ -1477,90 +1477,57 @@
 ;%0A%0A%09
-@Override%0A%09public void onApplicationEvent(ApplicationStartingEvent event) %7B%0A%09%09if (
+private static final boolean LIQUIBASE_PRESENT = 
 Clas
@@ -1543,16 +1543,20 @@
 Present(
+%0A%09%09%09
 %22liquiba
@@ -1611,55 +1611,177 @@
 %0A%09%09%09
-%09event.getSpringApplication().getClassLoader())
+LiquibaseServiceLocatorApplicationListener.class.getClassLoader());%0A%0A%09@Override%0A%09public void onApplicationEvent(ApplicationStartingEvent event) %7B%0A%09%09if (LIQUIBASE_PRESENT
 ) %7B%0A

Make isPresent check more Graal-friendly