前段时间看到群里有吐槽swagger整合问题,当时没仔细看,总以为是姿势不对。
这两天正好自己升级Spring Boot版本,然后突然出现了这样的一个错误:
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$1(Comparator.java:473) ~[na:na] at java.base/java.util.TimSort.countRunAndMakeAscending(TimSort.java:355) ~[na:na] at java.base/java.util.TimSort.sort(TimSort.java:220) ~[na:na] at java.base/java.util.Arrays.sort(Arrays.java:1307) ~[na:na] at java.base/java.util.ArrayList.sort(ArrayList.java:1721) ~[na:na] at java.base/java.util.stream.SortedOps$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:510) ~[na:na] at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[na:na] at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921) ~[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:682) ~[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$1.accept(ReferencePipeline.java:197) ~[na:na] at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625) ~[na:na] at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) ~[na:na] at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[na:na] at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921) ~[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:682) ~[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-5.3.20.jar:5.3.20] ... 14 common frames omitted
查了一下,找到一个Spring Boot下的Issue:https://github.com/spring-projects/spring-boot/issues/28794,但这个issue已经关闭了,目前这个问题的主要讨论在springfox,具体issue是这个:https://github.com/springfox/springfox/issues/3462
顺着这个issue看了一下,这个问题主要出现在Spring Boot 2.6及以后,只要是Spring Boot 2.6引入的新PathPatternParser导致的。
目前从评论中得处的解决方案是:
- Path匹配策略切换回
ant_path_matcher
spring.mvc.pathmatch.matching-strategy=ant_path_matcher
- 添加下面这个Bean的定义
@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)); }
我这边直接用了第一种方法,加了配置就好了。如果你最近也遇到这个问题,希望这篇文章对你起到帮助!
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