ClassNotFoundException (RouterFunctions$Visitor) v1.3.8

[agustisanchez]

I got the following error when starting up my Spring Boot application after updating SpringDoc from 1.3.7 to 1.3.8.

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerMapping' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Invocation of init method failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [org.springdoc.webmvc.api.OpenApiResource] from ClassLoader [sun.misc.Launcher$AppClassLoader@659e0bfd]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1771) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:847) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877) ~[spring-context-5.1.13.RELEASE.jar:5.1.13.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549) ~[spring-context-5.1.13.RELEASE.jar:5.1.13.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.1.12.RELEASE.jar:2.1.12.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:744) ~[spring-boot-2.1.12.RELEASE.jar:2.1.12.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:391) ~[spring-boot-2.1.12.RELEASE.jar:2.1.12.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:312) ~[spring-boot-2.1.12.RELEASE.jar:2.1.12.RELEASE]
	at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:140) [spring-boot-2.1.12.RELEASE.jar:2.1.12.RELEASE]
	at com.eccenca.elds.backend.Application.main(Application.java:108) [main/:na]
Caused by: java.lang.IllegalStateException: Failed to introspect Class [org.springdoc.webmvc.api.OpenApiResource] from ClassLoader [sun.misc.Launcher$AppClassLoader@659e0bfd]
	at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:507) ~[spring-core-5.1.13.RELEASE.jar:5.1.13.RELEASE]
	at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:404) ~[spring-core-5.1.13.RELEASE.jar:5.1.13.RELEASE]
	at org.springframework.core.MethodIntrospector.selectMethods(MethodIntrospector.java:72) ~[spring-core-5.1.13.RELEASE.jar:5.1.13.RELEASE]
Caused by: java.lang.IllegalStateException: Failed to introspect Class [org.springdoc.webmvc.api.OpenApiResource] from ClassLoader [sun.misc.Launcher$AppClassLoader@659e0bfd]

	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.detectHandlerMethods(AbstractHandlerMethodMapping.java:268) ~[spring-webmvc-5.1.13.RELEASE.jar:5.1.13.RELEASE]
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.processCandidateBean(AbstractHandlerMethodMapping.java:253) ~[spring-webmvc-5.1.13.RELEASE.jar:5.1.13.RELEASE]
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.initHandlerMethods(AbstractHandlerMethodMapping.java:212) ~[spring-webmvc-5.1.13.RELEASE.jar:5.1.13.RELEASE]
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.afterPropertiesSet(AbstractHandlerMethodMapping.java:200) ~[spring-webmvc-5.1.13.RELEASE.jar:5.1.13.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.afterPropertiesSet(RequestMappingHandlerMapping.java:165) ~[spring-webmvc-5.1.13.RELEASE.jar:5.1.13.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1830) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1767) ~[spring-beans-5.1.13.RELEASE.jar:5.1.13.RELEASE]
	... 15 common frames omitted
Caused by: java.lang.NoClassDefFoundError: org/springframework/web/servlet/function/RouterFunctions$Visitor
Caused by: java.lang.NoClassDefFoundError: org/springframework/web/servlet/function/RouterFunctions$Visitor

	at java.lang.Class.getDeclaredMethods0(Native Method) ~[na:1.8.0_242]
	at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) ~[na:1.8.0_242]
	at java.lang.Class.getDeclaredMethods(Class.java:1975) ~[na:1.8.0_242]
	at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:489) ~[spring-core-5.1.13.RELEASE.jar:5.1.13.RELEASE]
	... 24 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.springframework.web.servlet.function.RouterFunctions$Visitor
	at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[na:1.8.0_242]
Caused by: java.lang.ClassNotFoundException: org.springframework.web.servlet.function.RouterFunctions$Visitor

	at java.lang.ClassLoader.loadClass(ClassLoader.java:419) ~[na:1.8.0_242]
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352) ~[na:1.8.0_242]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:352) ~[na:1.8.0_242]
	... 28 common frames omitted

[bnasslahsen]

@agustisanchez,

Please have a look on the contribution guide before creating many issues:

• https://github.com/springdoc/springdoc-openapi/blob/master/CONTRIBUTING.adoc

Are You using spring-boot 1 or spring 4 ?

[agustisanchez]

springBootVersion = 2.1.12.RELEASE

[bnasslahsen]

Can you please validate if its fixed with the lastest SNAPSHOT so we can release it asap?

Here is the procedure to use it:

• https://springdoc.org/faq.html#how-can-i-use-the-last-springdoc-openapi-snapshot-

[agustisanchez]

I tested 1.3.9-SNAPSHOT and I no longer get the reported start-up exception.

I get an NPE when requesting swagger-ui, though.
If it's because the version being SNAPSHOT yet, you can close this issue.

The NPE is thrown when trying to merge schemas.
We have other schema-merge related issues that we plan to report later anyway.

Here's the mentioned NPE on requesting swagger-ui:

Thx

java.lang.NullPointerException: null
        at org.springdoc.core.SpringDocAnnotationsUtils.mergeSchema(SpringDocAnnotationsUtils.java:136) ~[springdoc-openapi-common-1.3.9-SNAPSHOT.jar:1.3.9-SNAPSHOT]
        at org.springdoc.core.GenericResponseBuilder.lambda$buildContentFromDoc$2(GenericResponseBuilder.java:173) ~[springdoc-openapi-common-1.3.9-SNAPSHOT.jar:1.3.9-SNAPSHOT]
        at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184) ~[na:1.8.0_191]
        at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175) ~[na:1.8.0_191]
        at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948) ~[na:1.8.0_191]
        at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) ~[na:1.8.0_191]
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) ~[na:1.8.0_191]
        at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151) ~[na:1.8.0_191]
        at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174) ~[na:1.8.0_191]
        at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:1.8.0_191]
        at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418) ~[na:1.8.0_191]
        at org.springdoc.core.GenericResponseBuilder.buildContentFromDoc(GenericResponseBuilder.java:173) ~[springdoc-openapi-common-1.3.9-SNAPSHOT.jar:1.3.9-SNAPSHOT]
        at org.springdoc.core.GenericResponseBuilder.computeResponse(GenericResponseBuilder.java:146) ~[springdoc-openapi-common-1.3.9-SNAPSHOT.jar:1.3.9-SNAPSHOT]
        at org.springdoc.core.GenericResponseBuilder.build(GenericResponseBuilder.java:96) ~[springdoc-openapi-common-1.3.9-SNAPSHOT.jar:1.3.9-SNAPSHOT]
        at org.springdoc.api.AbstractOpenApiResource.calculatePath(AbstractOpenApiResource.java:241) ~[springdoc-openapi-common-1.3.9-SNAPSHOT.jar:1.3.9-SNAPSHOT]
        at org.springdoc.api.AbstractOpenApiResource.calculatePath(AbstractOpenApiResource.java:334) ~[springdoc-openapi-common-1.3.9-SNAPSHOT.jar:1.3.9-SNAPSHOT]
        at org.springdoc.webmvc.api.OpenApiResource.calculatePath(OpenApiResource.java:167) ~[springdoc-openapi-webmvc-core-1.3.9-SNAPSHOT.jar:1.3.9-SNAPSHOT]
        at org.springdoc.webmvc.api.OpenApiResource.getPaths(OpenApiResource.java:133) ~[springdoc-openapi-webmvc-core-1.3.9-SNAPSHOT.jar:1.3.9-SNAPSHOT]
        at org.springdoc.api.AbstractOpenApiResource.getOpenApi(AbstractOpenApiResource.java:154) ~[springdoc-openapi-common-1.3.9-SNAPSHOT.jar:1.3.9-SNAPSHOT]
        at org.springdoc.webmvc.api.OpenApiResource.openapiJson(OpenApiResource.java:117) ~[springdoc-openapi-webmvc-core-1.3.9-SNAPSHOT.jar:1.3.9-SNAPSHOT]

[alienintheheights]

I'm on 1.3.9 (with Spring Boot 2.2.5) and getting the same java.lang.NoClassDefFoundError exception when hitting /api-docs. Same thing as above, it's dying on a static inner class.

java.lang.Class.getDeclaringClass0(Native Method)\n\tat java.lang.Class.getDeclaringClass(Class.java:1235)\n\tat java.lang.Class.getEnclosingClass(Class.java:1277)\n\tat java.lang.Class.getSimpleBinaryName(Class.java:1443)\n\tat java.lang.Class.getSimpleName(Class.java:1309)\n\tat io.swagger.v3.core.jackson.TypeNameResolver.nameForClass(TypeNameResolver.java:51)\n\tat io.swagger.v3.core.jackson.TypeNameResolver.nameForClass(TypeNameResolver.java:40)\n\tat io.swagger.v3.core.jackson.TypeNameResolver.nameForType(TypeNameResolver.java:36)\n\tat io.swagger.v3.core.jackson.TypeNameResolver.nameForType(TypeNameResolver.java:27)\n\tat io.swagger.v3.core.jackson.AbstractModelConverter._findTypeName(AbstractModelConverter.java:96)\n\tat io.swagger.v3.core.jackson.AbstractModelConverter._typeName(AbstractModelConverter.java:67)\n\tat io.swagger.v3.core.jackson.ModelResolver.resolve(ModelResolver.java:175)\n\tat org.springdoc.core.converters.AdditionalModelsConverter.resolve(AdditionalModelsConverter.java:67)\n\tat org.springdoc.core.converters.PropertyCustomizingConverter.resolve(PropertyCustomizingConverter.java:44)\n\tat org.springdoc.core.converters.FileSupportConverter.resolve(FileSupportConverter.java:46)\n\tat org.springdoc.core.converters.ResponseSupportConverter.resolve(ResponseSupportConverter.java:58)\n\tat org.springdoc.core.converters.SchemaPropertyDeprecatingConverter.resolve(SchemaPropertyDeprecatingConverter.java:48)\n\tat io.swagger.v3.core.converter.ModelConverterContextImpl.resolve(ModelConverterContextImpl.java:90)\n\tat io.swagger.v3.core.converter.ModelConverters.resolveAsResolvedSchema(ModelConverters.java:112)\n\tat org.springdoc.core.SpringDocAnnotationsUtils.extractSchema(SpringDocAnnotationsUtils.java:71)\n\tat org.springdoc.core.SpringDocAnnotationsUtils.extractSchema(SpringDocAnnotationsUtils.java:99)\n\tat org.springdoc.core.GenericResponseBuilder.calculateSchema(GenericResponseBuilder.java:268)\n\tat org.springdoc.core.GenericResponseBuilder.buildContent(GenericResponseBuilder.java:243)\n\tat org.springdoc.core.GenericResponseBuilder.buildApiResponses(GenericResponseBuilder.java:281)\n\tat org.springdoc.core.GenericResponseBuilder.buildApiResponses(GenericResponseBuilder.java:206)\n\tat org.springdoc.core.GenericResponseBuilder.computeResponse(GenericResponseBuilder.java:155)\n\tat org.springdoc.core.GenericResponseBuilder.build(GenericResponseBuilder.java:96)\n\tat org.springdoc.api.AbstractOpenApiResource.calculatePath(AbstractOpenApiResource.java:241)\n\tat org.springdoc.api.AbstractOpenApiResource.calculatePath(AbstractOpenApiResource.java:334)\n\tat org.springdoc.webmvc.api.OpenApiResource.calculatePath(OpenApiResource.java:167)\n\tat org.springdoc.webmvc.api.OpenApiResource.getPaths(OpenApiResource.java:133)\n\tat org.springdoc.api.AbstractOpenApiResource.getOpenApi(AbstractOpenApiResource.java:154)\n\tat org.springdoc.webmvc.api.OpenApiResource.openapiJson(OpenApiResource.java:117)\n\tat

[bnasslahsen]

@alienintheheights,

If you are reporting a bug, please help to speed up problem diagnosis by providing as much information as possible:

• You need to describe your context (the title of an issue is not enough)
• What version of spring-boot you are using?
• What modules and versions of springdoc-openapi are you using?
• What are the actual and the expected result using OpenAPI Description (yml or json)?
• Provide with a sample code (HelloController) or Test that reproduces the problem