在使用spring-cloud-gateway的时候，想使用其他的web容器，但是会遇到一个报错
java.lang.ClassCastException: org.springframework.core.io.buffer.DefaultDataBufferFactory cannot be cast to org.springframework.core.io.buffer.NettyDataBufferFactory
笔者折腾了半天、百度谷歌都没有解决方案，无奈只能去找源头Spencer Gibb 大神问了问。
image.png
他说现在只支持默认的NettyWebServer。不支持其他容器。
但是他也写了一个解决方案，
image.png
于是我翻阅了一下他的源码发现这两个bean是注释掉的。
如果想启用的话只能修改源码，于是我改了一下他的源码GatewayAutoConfiguration这个配置类：
/*
* Copyright 2013-2018 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
*
* http://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.cloud.gateway.config;
import com.netflix.hystrix.HystrixObservableCommand;
import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.actuate.autoconfigure.endpoint.condition.ConditionalOnEnabledEndpoint;
import org.springframework.boot.actuate.health.Health;
import org.springframework.boot.autoconfigure.AutoConfigureAfter;
import org.springframework.boot.autoconfigure.AutoConfigureBefore;
import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.autoconfigure.web.reactive.HttpHandlerAutoConfiguration;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.boot.context.properties.PropertyMapper;
import org.springframework.cloud.gateway.actuate.GatewayControllerEndpoint;
import org.springframework.cloud.gateway.filter.*;
import org.springframework.cloud.gateway.filter.factory.*;
import org.springframework.cloud.gateway.filter.factory.rewrite.ModifyRequestBodyGatewayFilterFactory;
import org.springframework.cloud.gateway.filter.factory.rewrite.ModifyResponseBodyGatewayFilterFactory;
import org.springframework.cloud.gateway.filter.headers.ForwardedHeadersFilter;
import org.springframework.cloud.gateway.filter.headers.HttpHeadersFilter;
import org.springframework.cloud.gateway.filter.headers.RemoveHopByHopHeadersFilter;
import org.springframework.cloud.gateway.filter.headers.XForwardedHeadersFilter;
import org.springframework.cloud.gateway.filter.ratelimit.KeyResolver;
import org.springframework.cloud.gateway.filter.ratelimit.PrincipalNameKeyResolver;
import org.springframework.cloud.gateway.filter.ratelimit.RateLimiter;
import org.springframework.cloud.gateway.handler.FilteringWebHandler;
import org.springframework.cloud.gateway.handler.RoutePredicateHandlerMapping;
import org.springframework.cloud.gateway.handler.predicate.*;
import org.springframework.cloud.gateway.route.*;
import org.springframework.cloud.gateway.route.builder.RouteLocatorBuilder;
import org.springframework.cloud.stream.reactive.shaded.rx.RxReactiveStreams;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.DependsOn;
import org.springframework.context.annotation.Primary;
import org.springframework.http.codec.ServerCodecConfigurer;
import org.springframework.util.StringUtils;
import org.springframework.validation.Validator;
import org.springframework.web.reactive.DispatcherHandler;
import org.springframework.web.reactive.function.client.WebClient;
import org.springframework.web.reactive.socket.client.ReactorNettyWebSocketClient;
import org.springframework.web.reactive.socket.client.WebSocketClient;
import org.springframework.web.reactive.socket.server.WebSocketService;
import org.springframework.web.reactive.socket.server.support.HandshakeWebSocketService;
import reactor.core.publisher.Flux;
import reactor.ipc.netty.http.client.HttpClient;
import reactor.ipc.netty.http.client.HttpClientOptions;
import reactor.ipc.netty.options.ClientProxyOptions;
import reactor.ipc.netty.resources.PoolResources;
import java.util.List;
import java.util.function.Consumer;
import static org.springframework.cloud.gateway.config.HttpClientProperties.Pool.PoolType.DISABLED;
import static org.springframework.cloud.gateway.config.HttpClientProperties.Pool.PoolType.FIXED;
/**
* @author Spencer Gibb
*/
@Configuration
@ConditionalOnProperty(name = "spring.cloud.gateway.enabled", matchIfMissing = true)
@EnableConfigurationProperties
@AutoConfigureBefore(HttpHandlerAutoConfiguration.class)
@AutoConfigureAfter({GatewayLoadBalancerClientAutoConfiguration.class, GatewayClassPathWarningAutoConfiguration.class})
@ConditionalOnClass(DispatcherHandler.class)
public class GatewayAutoConfiguration {
@Configuration
@ConditionalOnClass(HttpClient.class)
protected static class NettyConfiguration {
@Bean
@ConditionalOnMissingBean
public HttpClient httpClient(@Qualifier("nettyClientOptions") Consumer<? super HttpClientOptions.Builder> options) {
return HttpClient.create(options);
}
@Bean
public Consumer<? super HttpClientOptions.Builder> nettyClientOptions(HttpClientProperties properties) {
return opts -> {
// configure ssl
HttpClientProperties.Ssl ssl = properties.getSsl();
if (ssl.isUseInsecureTrustManager()) {
opts.sslSupport(sslContextBuilder -> {
sslContextBuilder.trustManager(InsecureTrustManagerFactory.INSTANCE);
});
}
// configure pool resources
HttpClientProperties.Pool pool = properties.getPool();
if (pool.getType() == DISABLED) {
opts.disablePool();
} else if (pool.getType() == FIXED) {
PoolResources poolResources = PoolResources.fixed(pool.getName(),
pool.getMaxConnections(), pool.getAcquireTimeout());
opts.poolResources(poolResources);
} else {
PoolResources poolResources = PoolResources.elastic(pool.getName());
opts.poolResources(poolResources);
}
// configure proxy if proxy host is set.
HttpClientProperties.Proxy proxy = properties.getProxy();
if (StringUtils.hasText(proxy.getHost())) {
opts.proxy(typeSpec -> {
ClientProxyOptions.Builder builder = typeSpec
.type(ClientProxyOptions.Proxy.HTTP)
.host(proxy.getHost());
PropertyMapper map = PropertyMapper.get();
map.from(proxy::getPort)
.whenNonNull()
.to(builder::port);
map.from(proxy::getUsername)
.whenHasText()
.to(builder::username);
map.from(proxy::getPassword)
.whenHasText()
.to(password -> builder.password(s -> password));
map.from(proxy::getNonProxyHostsPattern)
.whenHasText()
.to(builder::nonProxyHosts);
return builder;
});
}
};
}
@Bean
public HttpClientProperties httpClientProperties() {
return new HttpClientProperties();
}
// @Bean
public NettyRoutingFilter routingFilter(HttpClient httpClient,
ObjectProvider<List<HttpHeadersFilter>> headersFilters) {
return new NettyRoutingFilter(httpClient, headersFilters);
}
// @Bean
public NettyWriteResponseFilter nettyWriteResponseFilter(GatewayProperties properties) {
return new NettyWriteResponseFilter(properties.getStreamingMediaTypes());
}
@Bean
public ReactorNettyWebSocketClient reactorNettyWebSocketClient(@Qualifier("nettyClientOptions") Consumer<? super HttpClientOptions.Builder> options) {
return new ReactorNettyWebSocketClient(options);
}
}
@Bean
public RouteLocatorBuilder routeLocatorBuilder(ConfigurableApplicationContext context) {
return new RouteLocatorBuilder(context);
}
@Bean
@ConditionalOnMissingBean
public PropertiesRouteDefinitionLocator propertiesRouteDefinitionLocator(GatewayProperties properties) {
return new PropertiesRouteDefinitionLocator(properties);
}
@Bean
@ConditionalOnMissingBean(RouteDefinitionRepository.class)
public InMemoryRouteDefinitionRepository inMemoryRouteDefinitionRepository() {
return new InMemoryRouteDefinitionRepository();
}
@Bean
@Primary
public RouteDefinitionLocator routeDefinitionLocator(List<RouteDefinitionLocator> routeDefinitionLocators) {
return new CompositeRouteDefinitionLocator(Flux.fromIterable(routeDefinitionLocators));
}
@Bean
public RouteLocator routeDefinitionRouteLocator(GatewayProperties properties,
List<GatewayFilterFactory> GatewayFilters,
List<RoutePredicateFactory> predicates,
RouteDefinitionLocator routeDefinitionLocator) {
return new RouteDefinitionRouteLocator(routeDefinitionLocator, predicates, GatewayFilters, properties);
}
@Bean
@Primary
//TODO: property to disable composite?
public RouteLocator cachedCompositeRouteLocator(List<RouteLocator> routeLocators) {
return new CachingRouteLocator(new CompositeRouteLocator(Flux.fromIterable(routeLocators)));
}
@Bean
public RouteRefreshListener routeRefreshListener(ApplicationEventPublisher publisher) {
return new RouteRefreshListener(publisher);
}
@Bean
public FilteringWebHandler filteringWebHandler(List<GlobalFilter> globalFilters) {
return new FilteringWebHandler(globalFilters);
}
@Bean
public RoutePredicateHandlerMapping routePredicateHandlerMapping(FilteringWebHandler webHandler,
RouteLocator routeLocator) {
return new RoutePredicateHandlerMapping(webHandler, routeLocator);
}
// ConfigurationProperty beans
@Bean
public GatewayProperties gatewayProperties() {
return new GatewayProperties();
}
@Bean
public SecureHeadersProperties secureHeadersProperties() {
return new SecureHeadersProperties();
}
// HttpHeaderFilter beans
@Bean
@ConditionalOnProperty(name = "spring.cloud.gateway.forwarded.enabled", matchIfMissing = true)
public ForwardedHeadersFilter forwardedHeadersFilter() {
return new ForwardedHeadersFilter();
}
@Bean
public RemoveHopByHopHeadersFilter removeHopByHopHeadersFilter() {
return new RemoveHopByHopHeadersFilter();
}
@Bean
@ConditionalOnProperty(name = "spring.cloud.gateway.x-forwarded.enabled", matchIfMissing = true)
public XForwardedHeadersFilter xForwardedHeadersFilter() {
return new XForwardedHeadersFilter();
}
// GlobalFilter beans
@Bean
public AdaptCachedBodyGlobalFilter adaptCachedBodyGlobalFilter() {
return new AdaptCachedBodyGlobalFilter();
}
@Bean
public RouteToRequestUrlFilter routeToRequestUrlFilter() {
return new RouteToRequestUrlFilter();
}
@Bean
@ConditionalOnBean(DispatcherHandler.class)
public ForwardRoutingFilter forwardRoutingFilter(DispatcherHandler dispatcherHandler) {
return new ForwardRoutingFilter(dispatcherHandler);
}
@Bean
public ForwardPathFilter forwardPathFilter() {
return new ForwardPathFilter();
}
@Bean
public WebSocketService webSocketService() {
return new HandshakeWebSocketService();
}
@Bean
public WebsocketRoutingFilter websocketRoutingFilter(WebSocketClient webSocketClient,
WebSocketService webSocketService,
ObjectProvider<List<HttpHeadersFilter>> headersFilters) {
return new WebsocketRoutingFilter(webSocketClient, webSocketService, headersFilters);
}
@Bean
public WeightCalculatorWebFilter weightCalculatorWebFilter(@Qualifier("webFluxValidator") Validator validator) {
return new WeightCalculatorWebFilter(validator);
}
@Bean
//TODO: default over netty? configurable
public WebClientHttpRoutingFilter webClientHttpRoutingFilter() {
//TODO: WebClient bean
return new WebClientHttpRoutingFilter(WebClient.builder().build());
}
@Bean
public WebClientWriteResponseFilter webClientWriteResponseFilter() {
return new WebClientWriteResponseFilter();
}
// Predicate Factory beans
@Bean
public AfterRoutePredicateFactory afterRoutePredicateFactory() {
return new AfterRoutePredicateFactory();
}
@Bean
public BeforeRoutePredicateFactory beforeRoutePredicateFactory() {
return new BeforeRoutePredicateFactory();
}
@Bean
public BetweenRoutePredicateFactory betweenRoutePredicateFactory() {
return new BetweenRoutePredicateFactory();
}
@Bean
public CookieRoutePredicateFactory cookieRoutePredicateFactory() {
return new CookieRoutePredicateFactory();
}
@Bean
public HeaderRoutePredicateFactory headerRoutePredicateFactory() {
return new HeaderRoutePredicateFactory();
}
@Bean
public HostRoutePredicateFactory hostRoutePredicateFactory() {
return new HostRoutePredicateFactory();
}
@Bean
public MethodRoutePredicateFactory methodRoutePredicateFactory() {
return new MethodRoutePredicateFactory();
}
@Bean
public PathRoutePredicateFactory pathRoutePredicateFactory() {
return new PathRoutePredicateFactory();
}
@Bean
public QueryRoutePredicateFactory queryRoutePredicateFactory() {
return new QueryRoutePredicateFactory();
}
@Bean
public ReadBodyPredicateFactory readBodyPredicateFactory(ServerCodecConfigurer codecConfigurer) {
return new ReadBodyPredicateFactory(codecConfigurer);
}
@Bean
public RemoteAddrRoutePredicateFactory remoteAddrRoutePredicateFactory() {
return new RemoteAddrRoutePredicateFactory();
}
@Bean
@DependsOn("weightCalculatorWebFilter")
public WeightRoutePredicateFactory weightRoutePredicateFactory() {
return new WeightRoutePredicateFactory();
}
// GatewayFilter Factory beans
@Bean
public AddRequestHeaderGatewayFilterFactory addRequestHeaderGatewayFilterFactory() {
return new AddRequestHeaderGatewayFilterFactory();
}
@Bean
public AddRequestParameterGatewayFilterFactory addRequestParameterGatewayFilterFactory() {
return new AddRequestParameterGatewayFilterFactory();
}
@Bean
public AddResponseHeaderGatewayFilterFactory addResponseHeaderGatewayFilterFactory() {
return new AddResponseHeaderGatewayFilterFactory();
}
@Configuration
@ConditionalOnClass({HystrixObservableCommand.class, RxReactiveStreams.class})
protected static class HystrixConfiguration {
@Bean
public HystrixGatewayFilterFactory hystrixGatewayFilterFactory(DispatcherHandler dispatcherHandler) {
return new HystrixGatewayFilterFactory(dispatcherHandler);
}
}
@Bean
public ModifyRequestBodyGatewayFilterFactory modifyRequestBodyGatewayFilterFactory(ServerCodecConfigurer codecConfigurer) {
return new ModifyRequestBodyGatewayFilterFactory(codecConfigurer);
}
@Bean
public ModifyResponseBodyGatewayFilterFactory modifyResponseBodyGatewayFilterFactory(ServerCodecConfigurer codecConfigurer) {
return new ModifyResponseBodyGatewayFilterFactory(codecConfigurer);
}
@Bean
public PrefixPathGatewayFilterFactory prefixPathGatewayFilterFactory() {
return new PrefixPathGatewayFilterFactory();
}
@Bean
public PreserveHostHeaderGatewayFilterFactory preserveHostHeaderGatewayFilterFactory() {
return new PreserveHostHeaderGatewayFilterFactory();
}
@Bean
public RedirectToGatewayFilterFactory redirectToGatewayFilterFactory() {
return new RedirectToGatewayFilterFactory();
}
@Bean
public RemoveRequestHeaderGatewayFilterFactory removeRequestHeaderGatewayFilterFactory() {
return new RemoveRequestHeaderGatewayFilterFactory();
}
@Bean
public RemoveResponseHeaderGatewayFilterFactory removeResponseHeaderGatewayFilterFactory() {
return new RemoveResponseHeaderGatewayFilterFactory();
}
@Bean(name = PrincipalNameKeyResolver.BEAN_NAME)
@ConditionalOnBean(RateLimiter.class)
public PrincipalNameKeyResolver principalNameKeyResolver() {
return new PrincipalNameKeyResolver();
}
@Bean
@ConditionalOnBean({RateLimiter.class, KeyResolver.class})
public RequestRateLimiterGatewayFilterFactory requestRateLimiterGatewayFilterFactory(RateLimiter rateLimiter, PrincipalNameKeyResolver resolver) {
return new RequestRateLimiterGatewayFilterFactory(rateLimiter, resolver);
}
@Bean
public RewritePathGatewayFilterFactory rewritePathGatewayFilterFactory() {
return new RewritePathGatewayFilterFactory();
}
@Bean
public RetryGatewayFilterFactory retryGatewayFilterFactory() {
return new RetryGatewayFilterFactory();
}
@Bean
public SetPathGatewayFilterFactory setPathGatewayFilterFactory() {
return new SetPathGatewayFilterFactory();
}
@Bean
public SecureHeadersGatewayFilterFactory secureHeadersGatewayFilterFactory(SecureHeadersProperties properties) {
return new SecureHeadersGatewayFilterFactory(properties);
}
@Bean
public SetRequestHeaderGatewayFilterFactory setRequestHeaderGatewayFilterFactory() {
return new SetRequestHeaderGatewayFilterFactory();
}
@Bean
public SetResponseHeaderGatewayFilterFactory setResponseHeaderGatewayFilterFactory() {
return new SetResponseHeaderGatewayFilterFactory();
}
@Bean
public SetStatusGatewayFilterFactory setStatusGatewayFilterFactory() {
return new SetStatusGatewayFilterFactory();
}
@Bean
public SaveSessionGatewayFilterFactory saveSessionGatewayFilterFactory() {
return new SaveSessionGatewayFilterFactory();
}
@Bean
public StripPrefixGatewayFilterFactory stripPrefixGatewayFilterFactory() {
return new StripPrefixGatewayFilterFactory();
}
@Bean
public RequestHeaderToRequestUriGatewayFilterFactory requestHeaderToRequestUriGatewayFilterFactory() {
return new RequestHeaderToRequestUriGatewayFilterFactory();
}
@Configuration
@ConditionalOnClass(Health.class)
protected static class GatewayActuatorConfiguration {
@Bean
@ConditionalOnEnabledEndpoint
public GatewayControllerEndpoint gatewayControllerEndpoint(RouteDefinitionLocator routeDefinitionLocator, List<GlobalFilter> globalFilters,
List<GatewayFilterFactory> GatewayFilters, RouteDefinitionWriter routeDefinitionWriter,
RouteLocator routeLocator) {
return new GatewayControllerEndpoint(routeDefinitionLocator, globalFilters, GatewayFilters, routeDefinitionWriter, routeLocator);
}
}
}
将NettyRoutingFilter和NettyWriteResponseFilter这两个bean注释掉把GB大神说的WebClientHttpRoutingFilter和WebClientWriteResponseFilter注释放开。启动成功，访问正常。看似解决了，但是偶尔还会报一下错，还是netty的东西，
o.netty.util.ReferenceCountUtil : Failed to release a message: DefaultHttpContent(data: PooledUnsafeHeapByteBuf(freed), decoderResult: success)
io.netty.util.IllegalReferenceCountException: refCnt: 0, increment: 1
at io.netty.buffer.AbstractReferenceCountedByteBuf.release0(AbstractReferenceCountedByteBuf.java:100) ~[netty-buffer-4.1.23.Final.jar!/:4.1.23.Final]
at
最后决定暂时不折腾了，只能老老实实用他的NettyWebServer
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