在 Spring Boot 中添加 servlet 过滤器时没有默认构造函数
Posted
技术标签:
【中文标题】在 Spring Boot 中添加 servlet 过滤器时没有默认构造函数【英文标题】：No default constructor when adding servlet filter in Spring Boot 【发布时间】：2016-07-31 17:21:31 【问题描述】：我阅读了this other posting about how to add a servlet filter in Spring Boot，但是当我尝试按照其在UiApplication.java 类文件中添加内部WebConfig 类的示例时，我收到No Default Constructor 错误。
我正在尝试这样做，因为将ignoring(/api-url 添加到应用程序的SecurityConfig 类会导致一条消息指出/api-url has an empty filter list。我想为/api-url 添加一个servlet 过滤器，使其过滤器列表不再为空。
WebConfig 内部类的代码是：
@Configuration
public class WebConfig
@Bean
public FilterRegistrationBean shallowEtagHeaderFilter()
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setFilter(new ShallowEtagHeaderFilter());
registration.setDispatcherTypes(EnumSet.allOf(DispatcherType.class));
registration.addUrlPatterns("/api-url");
return registration;
需要对下面的代码进行哪些具体更改才能使 servlet 过滤器添加到/api-url 而不会抛出错误？
UiApplication.java类的完整代码为：
@SpringBootApplication
@Controller
public class UiApplication extends WebMvcConfigurerAdapter
@Configuration
public class WebConfig
@Bean
public FilterRegistrationBean shallowEtagHeaderFilter()
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setFilter(new ShallowEtagHeaderFilter());
registration.setDispatcherTypes(EnumSet.allOf(DispatcherType.class));
registration.addUrlPatterns("/api-url");
return registration;
public static void main(String[] args)
SpringApplication.run(UiApplication.class, args);
@Bean
public LocaleChangeInterceptor localeChangeInterceptor()
LocaleChangeInterceptor lci = new LocaleChangeInterceptor();
lci.setParamName("lang");
return lci;
@Override
public void addInterceptors(InterceptorRegistry registry)
registry.addInterceptor(localeChangeInterceptor());
@Configuration
@Order(SecurityProperties.ACCESS_OVERRIDE_ORDER)
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
protected static class SecurityConfiguration extends WebSecurityConfigurerAdapter
@Override
public void configure(WebSecurity webSecurity) throws Exception
webSecurity.ignoring().antMatchers("/api-url");
@Override
protected void configure(HttpSecurity http) throws Exception
http
.formLogin()
.and()
.httpBasic().and()
.authorizeRequests()
.antMatchers("/").permitAll()
.antMatchers("/secure**").permitAll()
.anyRequest().authenticated();;
当我尝试启动 Spring Boot jar 时，错误的完整堆栈跟踪是：
2016-04-10 10:32:58.759 ERROR 5174 --- [ main] o.s.boot.SpringApplication : Application startup failed
org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is org.springframework.boot.context.embedded.EmbeddedServletContainerException: Unable to start embedded Tomcat
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:133) ~[spring-boot-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:531) ~[spring-context-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118) ~[spring-boot-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:752) [spring-boot-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
at org.springframework.boot.SpringApplication.doRun(SpringApplication.java:347) [spring-boot-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:295) [spring-boot-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1112) [spring-boot-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1101) [spring-boot-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
at demo.UiApplication.main(UiApplication.java:193) [modular-0.0.1-SNAPSHOT.jar!/:0.0.1-SNAPSHOT]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_45]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_45]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_45]
at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_45]
at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:53) [modular-0.0.1-SNAPSHOT.jar!/:0.0.1-SNAPSHOT]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_45]
Caused by: org.springframework.boot.context.embedded.EmbeddedServletContainerException: Unable to start embedded Tomcat
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.initialize(TomcatEmbeddedServletContainer.java:99) ~[spring-boot-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.<init>(TomcatEmbeddedServletContainer.java:76) ~[spring-boot-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory.getTomcatEmbeddedServletContainer(TomcatEmbeddedServletContainerFactory.java:452) ~[spring-boot-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory.getEmbeddedServletContainer(TomcatEmbeddedServletContainerFactory.java:167) ~[spring-boot-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.createEmbeddedServletContainer(EmbeddedWebApplicationContext.java:158) ~[spring-boot-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:130) ~[spring-boot-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
... 14 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'demo.UiApplication$WebConfig': Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [demo.UiApplication$WebConfig$$EnhancerBySpringCGLIB$$f410234e]: No default constructor found; nested exception is java.lang.NoSuchMethodException: demo.UiApplication$WebConfig$$EnhancerBySpringCGLIB$$f410234e.<init>()
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1105) ~[spring-beans-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1050) ~[spring-beans-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510) ~[spring-beans-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:368) ~[spring-beans-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1123) ~[spring-beans-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1018) ~[spring-beans-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510) ~[spring-beans-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.boot.context.embedded.ServletContextInitializerBeans.getOrderedBeansOfType(ServletContextInitializerBeans.java:232) ~[spring-boot-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
at org.springframework.boot.context.embedded.ServletContextInitializerBeans.getOrderedBeansOfType(ServletContextInitializerBeans.java:213) ~[spring-boot-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
at org.springframework.boot.context.embedded.ServletContextInitializerBeans.addServletContextInitializerBeans(ServletContextInitializerBeans.java:89) ~[spring-boot-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
at org.springframework.boot.context.embedded.ServletContextInitializerBeans.<init>(ServletContextInitializerBeans.java:77) ~[spring-boot-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.getServletContextInitializerBeans(EmbeddedWebApplicationContext.java:235) ~[spring-boot-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.selfInitialize(EmbeddedWebApplicationContext.java:222) ~[spring-boot-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.access$000(EmbeddedWebApplicationContext.java:85) ~[spring-boot-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext$1.onStartup(EmbeddedWebApplicationContext.java:207) ~[spring-boot-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
at org.springframework.boot.context.embedded.tomcat.TomcatStarter.onStartup(TomcatStarter.java:55) ~[spring-boot-1.3.0.RELEASE.jar!/:1.3.0.RELEASE]
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5170) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398) ~[tomcat-embed-core-8.0.28.jar!/:8.0.28]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_45]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_45]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_45]
... 1 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [demo.UiApplication$WebConfig$$EnhancerBySpringCGLIB$$f410234e]: No default constructor found; nested exception is java.lang.NoSuchMethodException: demo.UiApplication$WebConfig$$EnhancerBySpringCGLIB$$f410234e.<init>()
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:85) ~[spring-beans-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1098) ~[spring-beans-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
... 33 common frames omitted
Caused by: java.lang.NoSuchMethodException: demo.UiApplication$WebConfig$$EnhancerBySpringCGLIB$$f410234e.<init>()
at java.lang.Class.getConstructor0(Class.java:3082) ~[na:1.8.0_45]
at java.lang.Class.getDeclaredConstructor(Class.java:2178) ~[na:1.8.0_45]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:80) ~[spring-beans-4.2.3.RELEASE.jar!/:4.2.3.RELEASE]
... 34 common frames omitted
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:53)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is org.springframework.boot.context.embedded.EmbeddedServletContainerException: Unable to start embedded Tomcat
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:133)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:531)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:752)
at org.springframework.boot.SpringApplication.doRun(SpringApplication.java:347)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:295)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1112)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1101)
at demo.UiApplication.main(UiApplication.java:193)
... 6 more
Caused by: org.springframework.boot.context.embedded.EmbeddedServletContainerException: Unable to start embedded Tomcat
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.initialize(TomcatEmbeddedServletContainer.java:99)
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.<init>(TomcatEmbeddedServletContainer.java:76)
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory.getTomcatEmbeddedServletContainer(TomcatEmbeddedServletContainerFactory.java:452)
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory.getEmbeddedServletContainer(TomcatEmbeddedServletContainerFactory.java:167)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.createEmbeddedServletContainer(EmbeddedWebApplicationContext.java:158)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:130)
... 14 more
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'demo.UiApplication$WebConfig': Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [demo.UiApplication$WebConfig$$EnhancerBySpringCGLIB$$f410234e]: No default constructor found; nested exception is java.lang.NoSuchMethodException: demo.UiApplication$WebConfig$$EnhancerBySpringCGLIB$$f410234e.<init>()
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1105)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1050)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:368)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1123)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1018)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
at org.springframework.boot.context.embedded.ServletContextInitializerBeans.getOrderedBeansOfType(ServletContextInitializerBeans.java:232)
at org.springframework.boot.context.embedded.ServletContextInitializerBeans.getOrderedBeansOfType(ServletContextInitializerBeans.java:213)
at org.springframework.boot.context.embedded.ServletContextInitializerBeans.addServletContextInitializerBeans(ServletContextInitializerBeans.java:89)
at org.springframework.boot.context.embedded.ServletContextInitializerBeans.<init>(ServletContextInitializerBeans.java:77)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.getServletContextInitializerBeans(EmbeddedWebApplicationContext.java:235)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.selfInitialize(EmbeddedWebApplicationContext.java:222)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.access$000(EmbeddedWebApplicationContext.java:85)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext$1.onStartup(EmbeddedWebApplicationContext.java:207)
at org.springframework.boot.context.embedded.tomcat.TomcatStarter.onStartup(TomcatStarter.java:55)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5170)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
... 1 more
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [demo.UiApplication$WebConfig$$EnhancerBySpringCGLIB$$f410234e]: No default constructor found; nested exception is java.lang.NoSuchMethodException: demo.UiApplication$WebConfig$$EnhancerBySpringCGLIB$$f410234e.<init>()
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:85)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1098)
... 33 more
Caused by: java.lang.NoSuchMethodException: demo.UiApplication$WebConfig$$EnhancerBySpringCGLIB$$f410234e.<init>()
at java.lang.Class.getConstructor0(Class.java:3082)
at java.lang.Class.getDeclaredConstructor(Class.java:2178)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:80)
... 34 more
[root@localhost CustomLogin2]#
【问题讨论】：
使WebConfig 静态...
你用的是哪个版本的SpringBoot？
@Hareesh 我使用的是 Spring Boot 1.3 版。
【参考方案1】：
使您的 WebConfig 类静态：
@Configuration
public static class WebConfig ...
另外，不要将所有配置放在一个类中，尝试将它们放在不同的类中。
【讨论】：
谢谢你和 +1。在您指定的位置添加单词static 导致应用程序编译。但这只是OP问题的一半。如何解决 OP 的后半部分，这将确认 /api-url 现在确实附加了一个过滤器？
向以api-url 开头并带有适当的etag 标头的端点之一发送请求，并在ShallowEtagHeaderFilter#doFilterInternal 中放置断点。
谢谢。 “适当的 etag 标头”是什么意思？我已经发送了/api-url 的请求，结果是调试日志打印/api-url has an empty filter list。实际的 url 是 /registration-form，但我在这个 OP 中使用术语 /api-url 来保持通用性，以便其他人也可以使用它。
另外，我查看了UiApplication.java，没有ShallowEtagHeaderFilter#doFilterInternal，所以我不确定在哪里放置断点。
ShallowEtagHeaderFilter 有一个名为 doFilterInteral 的方法。【参考方案2】：
请关注以下两个有类似问题的问题，
Steven回答
还有Spring-Project的问题
【讨论】：
以上是关于在 Spring Boot 中添加 servlet 过滤器时没有默认构造函数的主要内容，如果未能解决你的问题，请参考以下文章
Spring Boot参考教程Spring Boot配置Servlet，Filter，Listener，Interceptor