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Spring Boot 2.6.0 / Spring fox 3 - 无法启动 bean '文档插件引导程序'

穆季萌
2023-03-14

我正在尝试使用OpenJDK15、SpringBoot2.6.0、Springfox3启动一个SpringBoot项目。

我们正在开发一个取代Netty作为Web服务器并使用Jetty的项目，因为我们不需要非阻塞环境。

在代码中我们主要依赖于Reactor API (Flux，Mono)，所以我们不能移除< code > org . spring framework . boot:spring-boot-starter-web Flux 依赖项。

我重复了我们在一个新项目中遇到的问题：https://github.com/jvacaq/spring-fox.

我发现我们的 build.gradle 文件中的这些行是问题的根源。

compile("org.springframework.boot:spring-boot-starter-web") {
   exclude module: "spring-boot-starter-tomcat"
}
compile("org.springframework.boot:spring-boot-starter-jetty")

这是build.gradle文件：

plugins {
    id 'org.springframework.boot' version '2.6.0'
    id 'io.spring.dependency-management' version '1.0.11.RELEASE'
    id 'java'
}

group = 'com.example'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '11'

repositories {
    mavenCentral()
}

dependencies {
    compile("org.springframework.boot:spring-boot-starter-web") {
        exclude module: "spring-boot-starter-tomcat"
    }
    compile("org.springframework.boot:spring-boot-starter-jetty")
    implementation 'org.springframework.boot:spring-boot-starter-webflux'
    testImplementation 'org.springframework.boot:spring-boot-starter-test'
    testImplementation 'io.projectreactor:reactor-test'
    implementation "io.springfox:springfox-boot-starter:3.0.0"
}

test {
    useJUnitPlatform()
}

我发出了命令gradle干净启动运行。结果是此错误：

gradle clean bootrun

> Task :bootRun FAILED

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v2.6.0)

2021-11-19 09:41:06.665  INFO 16666 --- [           main] c.e.springfox.SpringFoxApplication       : Starting SpringFoxApplication using Java 15.0.2 on advance-Inspiron-5379 with PID 16666 (/home/advance/projects/spring-fox/build/classes/java/main started by advance in /home/advance/projects/spring-fox)
2021-11-19 09:41:06.666  INFO 16666 --- [           main] c.e.springfox.SpringFoxApplication       : No active profile set, falling back to default profiles: default
2021-11-19 09:41:07.294  INFO 16666 --- [           main] org.eclipse.jetty.util.log               : Logging initialized @1132ms to org.eclipse.jetty.util.log.Slf4jLog
2021-11-19 09:41:07.396  INFO 16666 --- [           main] o.s.b.w.e.j.JettyServletWebServerFactory : Server initialized with port: 8080
2021-11-19 09:41:07.398  INFO 16666 --- [           main] org.eclipse.jetty.server.Server          : jetty-9.4.44.v20210927; built: 2021-09-27T23:02:44.612Z; git: 8da83308eeca865e495e53ef315a249d63ba9332; jvm 15.0.2+7-27
2021-11-19 09:41:07.417  INFO 16666 --- [           main] o.e.j.s.h.ContextHandler.application     : Initializing Spring embedded WebApplicationContext
2021-11-19 09:41:07.417  INFO 16666 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 713 ms
2021-11-19 09:41:07.474  INFO 16666 --- [           main] org.eclipse.jetty.server.session         : DefaultSessionIdManager workerName=node0
2021-11-19 09:41:07.474  INFO 16666 --- [           main] org.eclipse.jetty.server.session         : No SessionScavenger set, using defaults
2021-11-19 09:41:07.475  INFO 16666 --- [           main] org.eclipse.jetty.server.session         : node0 Scavenging every 660000ms
2021-11-19 09:41:07.480  INFO 16666 --- [           main] o.e.jetty.server.handler.ContextHandler  : Started o.s.b.w.e.j.JettyEmbeddedWebAppContext@6aa3bfc{application,/,[file:///tmp/jetty-docbase.8080.2024342829220941812/, jar:file:/home/advance/.gradle/caches/modules-2/files-2.1/io.springfox/springfox-swagger-ui/3.0.0/1e665fbe22148f7c36fa8a08e515a0047cd4390b/springfox-swagger-ui-3.0.0.jar!/META-INF/resources],AVAILABLE}
2021-11-19 09:41:07.480  INFO 16666 --- [           main] org.eclipse.jetty.server.Server          : Started @1318ms
2021-11-19 09:41:07.920  INFO 16666 --- [           main] o.e.j.s.h.ContextHandler.application     : Initializing Spring DispatcherServlet 'dispatcherServlet'
2021-11-19 09:41:07.920  INFO 16666 --- [           main] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2021-11-19 09:41:07.921  INFO 16666 --- [           main] o.s.web.servlet.DispatcherServlet        : Completed initialization in 1 ms
2021-11-19 09:41:07.931  INFO 16666 --- [           main] o.e.jetty.server.AbstractConnector       : Started ServerConnector@2643d762{HTTP/1.1, (http/1.1)}{0.0.0.0:8080}
2021-11-19 09:41:07.932  INFO 16666 --- [           main] o.s.b.web.embedded.jetty.JettyWebServer  : Jetty started on port(s) 8080 (http/1.1) with context path '/'
2021-11-19 09:41:07.934  WARN 16666 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException: Cannot invoke "org.springframework.web.servlet.mvc.condition.PatternsRequestCondition.getPatterns()" because "this.condition" is null
2021-11-19 09:41:07.949  INFO 16666 --- [           main] o.e.jetty.server.AbstractConnector       : Stopped ServerConnector@2643d762{HTTP/1.1, (http/1.1)}{0.0.0.0:8080}
2021-11-19 09:41:07.950  INFO 16666 --- [           main] org.eclipse.jetty.server.session         : node0 Stopped scavenging
2021-11-19 09:41:07.951  INFO 16666 --- [           main] o.e.j.s.h.ContextHandler.application     : Destroying Spring FrameworkServlet 'dispatcherServlet'
2021-11-19 09:41:07.951  INFO 16666 --- [           main] o.e.jetty.server.handler.ContextHandler  : Stopped o.s.b.w.e.j.JettyEmbeddedWebAppContext@6aa3bfc{application,/,[file:///tmp/jetty-docbase.8080.2024342829220941812/, jar:file:/home/advance/.gradle/caches/modules-2/files-2.1/io.springfox/springfox-swagger-ui/3.0.0/1e665fbe22148f7c36fa8a08e515a0047cd4390b/springfox-swagger-ui-3.0.0.jar!/META-INF/resources],STOPPED}
2021-11-19 09:41:07.958  INFO 16666 --- [           main] ConditionEvaluationReportLoggingListener :

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-11-19 09:41:07.970 ERROR 16666 --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.context.ApplicationContextException: Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException: Cannot invoke "org.springframework.web.servlet.mvc.condition.PatternsRequestCondition.getPatterns()" because "this.condition" is null
        at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:181) ~[spring-context-5.3.13.jar:5.3.13]
        at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:54) ~[spring-context-5.3.13.jar:5.3.13]
        at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:356) ~[spring-context-5.3.13.jar:5.3.13]
        at java.base/java.lang.Iterable.forEach(Iterable.java:75) ~[na:na]
        at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:155) ~[spring-context-5.3.13.jar:5.3.13]
        at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:123) ~[spring-context-5.3.13.jar:5.3.13]
        at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:935) ~[spring-context-5.3.13.jar:5.3.13]
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:586) ~[spring-context-5.3.13.jar:5.3.13]
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.6.0.jar:2.6.0]
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:730) ~[spring-boot-2.6.0.jar:2.6.0]
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:412) ~[spring-boot-2.6.0.jar:2.6.0]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:302) ~[spring-boot-2.6.0.jar:2.6.0]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1301) ~[spring-boot-2.6.0.jar:2.6.0]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1290) ~[spring-boot-2.6.0.jar:2.6.0]
        at com.example.springfox.SpringFoxApplication.main(SpringFoxApplication.java:10) ~[main/:na]
Caused by: java.lang.NullPointerException: Cannot invoke "org.springframework.web.servlet.mvc.condition.PatternsRequestCondition.getPatterns()" because "this.condition" is null
        at springfox.documentation.spring.web.WebMvcPatternsRequestConditionWrapper.getPatterns(WebMvcPatternsRequestConditionWrapper.java:56) ~[springfox-spring-webmvc-3.0.0.jar:3.0.0]
        at springfox.documentation.RequestHandler.sortedPaths(RequestHandler.java:113) ~[springfox-core-3.0.0.jar:3.0.0]
        at springfox.documentation.spi.service.contexts.Orderings.lambda$byPatternsCondition$3(Orderings.java:89) ~[springfox-spi-3.0.0.jar:3.0.0]
        at java.base/java.util.Comparator.lambda$comparing$77a9974f$1(Comparator.java:469) ~[na:na]
        at java.base/java.util.TimSort.countRunAndMakeAscending(TimSort.java:355) ~[na:na]
        at java.base/java.util.TimSort.sort(TimSort.java:220) ~[na:na]
        at java.base/java.util.Arrays.sort(Arrays.java:1306) ~[na:na]
        at java.base/java.util.ArrayList.sort(ArrayList.java:1721) ~[na:na]
        at java.base/java.util.stream.SortedOps$RefSortingSink.end(SortedOps.java:392) ~[na:na]
        at java.base/java.util.stream.Sink$ChainedReference.end(Sink.java:258) ~[na:na]
        at java.base/java.util.stream.Sink$ChainedReference.end(Sink.java:258) ~[na:na]
        at java.base/java.util.stream.Sink$ChainedReference.end(Sink.java:258) ~[na:na]
        at java.base/java.util.stream.Sink$ChainedReference.end(Sink.java:258) ~[na:na]
        at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:485) ~[na:na]
        at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) ~[na:na]
        at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913) ~[na:na]
        at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:na]
        at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578) ~[na:na]
        at springfox.documentation.spring.web.plugins.WebMvcRequestHandlerProvider.requestHandlers(WebMvcRequestHandlerProvider.java:81) ~[springfox-spring-webmvc-3.0.0.jar:3.0.0]
        at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195) ~[na:na]
        at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625) ~[na:na]
        at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) ~[na:na]
        at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) ~[na:na]
        at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913) ~[na:na]
        at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:na]
        at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578) ~[na:na]
        at springfox.documentation.spring.web.plugins.AbstractDocumentationPluginsBootstrapper.withDefaults(AbstractDocumentationPluginsBootstrapper.java:107) ~[springfox-spring-web-3.0.0.jar:3.0.0]
        at springfox.documentation.spring.web.plugins.AbstractDocumentationPluginsBootstrapper.buildContext(AbstractDocumentationPluginsBootstrapper.java:91) ~[springfox-spring-web-3.0.0.jar:3.0.0]
        at springfox.documentation.spring.web.plugins.AbstractDocumentationPluginsBootstrapper.bootstrapDocumentationPlugins(AbstractDocumentationPluginsBootstrapper.java:82) ~[springfox-spring-web-3.0.0.jar:3.0.0]
        at springfox.documentation.spring.web.plugins.DocumentationPluginsBootstrapper.start(DocumentationPluginsBootstrapper.java:100) ~[springfox-spring-web-3.0.0.jar:3.0.0]
        at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:178) ~[spring-context-5.3.13.jar:5.3.13]
        ... 14 common frames omitted


FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':bootRun'.
> Process 'command '/home/advance/.sdkman/candidates/java/15.0.2-open/bin/java'' finished with non-zero exit value 1

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

Deprecated Gradle features were used in this build, making it incompatible with Gradle 7.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/6.9.1/userguide/command_line_interface.html#sec:command_line_warnings

BUILD FAILED in 2s
5 actionable tasks: 5 executed

我该如何解决？

共有3个答案

郑帅
2023-03-14

只有在主类中添加@EnableWebMvc才能解决问题：

@EnableWebMvc
@SpringBootApplication
public class MyApp {
    public static void main(String[] args) {
        SpringApplication.run(MyApp.class);
    }
}
仉磊
2023-03-14

下面问题评论中提到的解决方法似乎也适用于使用Spring执行器的人。仅仅更改路径匹配器对于使用执行器的项目不起作用。

>

  • 在＜code＞应用程序中设置。属性文件：

    ＜code＞spring.mvc.pathmatch。匹配策略到ant_path_matcher

    在下面添加@Bean：

    @Bean
public WebMvcEndpointHandlerMapping webEndpointServletHandlerMapping(
                WebEndpointsSupplier webEndpointsSupplier, 
                ServletEndpointsSupplier servletEndpointsSupplier, 
                ControllerEndpointsSupplier controllerEndpointsSupplier, 
                EndpointMediaTypes endpointMediaTypes,
                CorsEndpointProperties corsProperties, 
                WebEndpointProperties webEndpointProperties, 
                Environment environment) {
    List<ExposableEndpoint<?>> allEndpoints = new ArrayList();
    Collection<ExposableWebEndpoint> webEndpoints = webEndpointsSupplier.getEndpoints();
    allEndpoints.addAll(webEndpoints);
    allEndpoints.addAll(servletEndpointsSupplier.getEndpoints());
    allEndpoints.addAll(controllerEndpointsSupplier.getEndpoints());
    String basePath = webEndpointProperties.getBasePath();
    EndpointMapping endpointMapping = new EndpointMapping(basePath);
    boolean shouldRegisterLinksMapping = this.shouldRegisterLinksMapping(
                webEndpointProperties, environment, basePath);
    return new WebMvcEndpointHandlerMapping(endpointMapping, webEndpoints, 
                endpointMediaTypes, corsProperties.toCorsConfiguration(), 
                new EndpointLinksResolver(allEndpoints, basePath), 
                shouldRegisterLinksMapping, null);
}

private boolean shouldRegisterLinksMapping(WebEndpointProperties webEndpointProperties, 
                                           Environment environment, String basePath) {
    return webEndpointProperties.getDiscovery().isEnabled() && 
                (StringUtils.hasText(basePath) || 
                ManagementPortType.get(environment).equals(ManagementPortType.DIFFERENT));
}

    参考：

    • https://github.com/springfox/springfox/issues/3462#issuecomment-1010721223

    • 丁善
    2023-03-14

    这个问题是由Springfox中的一个bug引起的。它在假设Spring MVC是如何设置的，这并不总是正确的。具体来说，它假设MVC的路径匹配将使用基于Ant的路径匹配器，而不是基于PathPattern的匹配器。基于PathPattern的匹配已经是一个选项了，从Spring Boot 2.6开始是默认的。

    正如Spring Boot 2.6的发行说明中所述，您可以通过将< code > application . properties 文件中的< code > spring . MVC . path match . matching-strategy 设置为< code>ant-path-matcher来恢复Springfox假定将使用的配置。请注意，这将只在你不使用Spring Boot的驱动器。无论配置的< code >匹配策略如何，执行器始终使用基于路径模式的解析。如果你想在Spring Boot 2.6和更高版本中使用Springfox，就需要对它进行修改。

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