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Spring Boot Actuator AutoConfigure
/*
* 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.actuate.autoconfigure.web.servlet;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.HierarchicalBeanFactory;
import org.springframework.beans.factory.ListableBeanFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.web.servlet.error.DefaultErrorAttributes;
import org.springframework.core.annotation.AnnotationAwareOrderComparator;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver;
/**
* Composite {@link HandlerExceptionResolver}.
*
* @author Andy Wilkinson
* @author Stephane Nicoll
* @author Phillip Webb
* @author Scott Frederick
* @author Guirong Hu
*/
class CompositeHandlerExceptionResolver implements HandlerExceptionResolver {
@Autowired
private ListableBeanFactory beanFactory;
private transient List resolvers;
@Override
public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler,
Exception ex) {
for (HandlerExceptionResolver resolver : getResolvers()) {
ModelAndView resolved = resolver.resolveException(request, response, handler, ex);
if (resolved != null) {
return resolved;
}
}
return null;
}
private List getResolvers() {
List resolvers = this.resolvers;
if (resolvers == null) {
resolvers = new ArrayList<>();
collectResolverBeans(resolvers, this.beanFactory);
resolvers.remove(this);
AnnotationAwareOrderComparator.sort(resolvers);
if (resolvers.isEmpty()) {
resolvers.add(new DefaultErrorAttributes());
resolvers.add(new DefaultHandlerExceptionResolver());
}
this.resolvers = resolvers;
}
return resolvers;
}
private void collectResolverBeans(List resolvers, BeanFactory beanFactory) {
if (beanFactory instanceof ListableBeanFactory) {
ListableBeanFactory listableBeanFactory = (ListableBeanFactory) beanFactory;
resolvers.addAll(listableBeanFactory.getBeansOfType(HandlerExceptionResolver.class).values());
}
if (beanFactory instanceof HierarchicalBeanFactory) {
HierarchicalBeanFactory hierarchicalBeanFactory = (HierarchicalBeanFactory) beanFactory;
collectResolverBeans(resolvers, hierarchicalBeanFactory.getParentBeanFactory());
}
}
}