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JoinFaces AutoConfigure

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/*
 * Copyright 2016-2022 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.joinfaces.autoconfigure;

import java.lang.annotation.Annotation;

import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import lombok.extern.slf4j.Slf4j;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.context.event.ApplicationStartedEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.context.ConfigurableApplicationContext;

/**
 * This class analyzes the {@link SpringApplication} and its {@link ApplicationStartedEvent#getApplicationContext() context}.
 *
 * @author Lars Grefer
 */
@Slf4j
public class JoinfacesApplicationAnalyzer implements ApplicationListener {

	@SuppressWarnings("unchecked")
	@Override
	public void onApplicationEvent(ApplicationStartedEvent event) {
		try {
			Class managedBeanClass = (Class) Class.forName("jakarta.faces.bean.ManagedBean");
			warnAboutJsfManagedBeans(event.getApplicationContext(), managedBeanClass);
		}
		catch (ClassNotFoundException | LinkageError ignored) {
		}
	}

	@SuppressFBWarnings(value = "NP_NULL_ON_SOME_PATH_FROM_RETURN_VALUE", justification = "getType() is always non-null when reached")
	private void warnAboutJsfManagedBeans(ConfigurableApplicationContext applicationContext, Class managedBeanClass) {
		String[] managedBeanNames = applicationContext.getBeanNamesForAnnotation(managedBeanClass);

		for (String managedBeanName : managedBeanNames) {
			log.warn(
					"The spring bean '{}' of type '{}' is also annotated with '@jakarta.faces.bean.ManagedBean'. This may lead to unexpected behaviour.",
					managedBeanName,
					applicationContext.getType(managedBeanName).getName()
			);
		}
	}
}