OpenAPITools / OpenAPITools/openapi-generator

[BUG] release v7.10.0 for `kotlin-spring` breaks file upload APIs

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Issue: Bug
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Description

Bug Report Checklist
  • Have you provided a full/minimal spec to reproduce the issue?
  • Have you validated the input using an OpenAPI validator (example)?
  • Have you tested with the latest master to confirm the issue still exists?
  • Have you searched for related issues/PRs?
  • What's the actual output vs expected output?
  • [Optional] Sponsorship to speed up the bug fix or feature request (example)
Description

When upgrading the openapi-generator to v7.10.0 we noticed a regression in the kotlin-spring generator.
The "fix" on the server side could be easy but it breaks existing clients (s.b.).

This commit introduced the breaking change: https://github.com/OpenAPITools/openapi-generator/commit/e131d52ad00a77b6e2394debb47289ab86cebce3

Our generated server API before:

    override fun uploadFile(
        @NotNull @Valid @RequestParam(value = "name", required = true) name: String,
        @Valid @RequestBody body: org.springframework.core.io.Resource,
        @Valid @RequestParam(value = "expiry", required = false) expiry: Int?,
    )

and after

    override fun uploadFile(
        @NotNull @Valid @RequestParam(value = "name", required = true) name: String,
        @Valid @RequestBody body: org.springframework.web.multipart.MultipartFile,
        @Valid @RequestParam(value = "expiry", required = false) expiry: Int?,
    )
openapi-generator version

v7.10.0

OpenAPI declaration file content or url

https://gist.github.com/dvag-gloeckner-daniel/05d71269370bb47981562719f24dc494

Generation Details

Using maven plugin:


            <plugin>
                <groupId>org.openapitools</groupId>
                <artifactId>openapi-generator-maven-plugin</artifactId>
                <version>7.10.0</version>
                <executions>
                    <execution>
                        <id>generate-api-stubs</id>
                        <configuration>
                            <inputSpec>${project.basedir}/spec/service.yaml</inputSpec>
                            <output>${project.build.directory}/generated-sources</output>
                            <modelPackage>com.sth.model</modelPackage>
                            <apiPackage>com.sth.api</apiPackage>
                            <generatorName>kotlin-spring</generatorName>
                            <generateSupportingFiles>false</generateSupportingFiles>
                            <generateApiTests>false</generateApiTests>
                            <generateModelTests>false</generateModelTests>
                            <configOptions>
                                <useSpringBoot3>true</useSpringBoot3>
                                <documentationProvider>none</documentationProvider>
                                <interfaceOnly>true</interfaceOnly>
                                <useTags>true</useTags>
                                <library>spring-boot</library>
                                <gradleBuildFile>false</gradleBuildFile>
                                <enumPropertyNaming>UPPERCASE</enumPropertyNaming>
                                <requestMappingMode>none</requestMappingMode>
                            </configOptions>
                        </configuration>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
Steps to reproduce

Use the provided API spec and the generator with the provided configuration.

The client in typescript:

        const uploadResponse = await request.post('/api/v1/upload', {
            data: buffer.Buffer.from('Hello World'),
            headers: {'Content-Type': 'application/octet-stream', 'Accept': 'application/json',},
            params: {name: 'murksi murkis mürks.txt', expiry: 1},
        });

Resulting server side exception:

java.lang.NullPointerException: Parameter specified as non-null is null: method com.sth.upload.UploadController.uploadFile, parameter body
	at com.sth.upload.UploadController.uploadFile(UploadController.kt:25) ~[!/:1.0.0-SNAPSHOT]
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ~[na:na]
	at java.base/java.lang.reflect.Method.invoke(Method.java:580) ~[na:na]
	at kotlin.reflect.jvm.internal.calls.CallerImpl$Method.callMethod(CallerImpl.kt:97) ~[kotlin-reflect-2.1.0.jar:2.1.0-release-394]
	at kotlin.reflect.jvm.internal.calls.CallerImpl$Method$Instance.call(CallerImpl.kt:113) ~[kotlin-reflect-2.1.0.jar:2.1.0-release-394]
	at kotlin.reflect.jvm.internal.KCallableImpl.callDefaultMethod$kotlin_reflection(KCallableImpl.kt:207) ~[kotlin-reflect-2.1.0.jar:2.1.0-release-394]
	at kotlin.reflect.jvm.internal.KCallableImpl.callBy(KCallableImpl.kt:112) ~[kotlin-reflect-2.1.0.jar:2.1.0-release-394]
	at org.springframework.web.method.support.InvocableHandlerMethod$KotlinDelegate.invokeFunction(InvocableHandlerMethod.java:337) ~[spring-web-6.2.1.jar:6.2.1]
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:254) ~[spring-web-6.2.1.jar:6.2.1]
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:190) ~[spring-web-6.2.1.jar:6.2.1]
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:118) ~[spring-webmvc-6.2.1.jar:6.2.1]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:986) ~[spring-webmvc-6.2.1.jar:6.2.1]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:891) ~[spring-webmvc-6.2.1.jar:6.2.1]
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-6.2.1.jar:6.2.1]
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1088) ~[spring-webmvc-6.2.1.jar:6.2.1]
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:978) ~[spring-webmvc-6.2.1.jar:6.2.1]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014) ~[spring-webmvc-6.2.1.jar:6.2.1]
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:914) ~[spring-webmvc-6.2.1.jar:6.2.1]
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:590) ~[tomcat-embed-core-10.1.34.jar:6.0]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885) ~[spring-webmvc-6.2.1.jar:6.2.1]
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658) ~[tomcat-embed-core-10.1.34.jar:6.0]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:195) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) ~[tomcat-embed-websocket-10.1.34.jar:10.1.34]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:108) ~[spring-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.FilterChainProxy.lambda$doFilterInternal$3(FilterChainProxy.java:231) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$FilterObservation$SimpleFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:479) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:340) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator.lambda$wrapSecured$0(ObservationFilterChainDecorator.java:82) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:128) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.access.intercept.AuthorizationFilter.doFilter(AuthorizationFilter.java:101) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:126) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:120) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:131) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:85) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:100) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:179) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.context.SecurityContextHolderFilter.doFilter(SecurityContextHolderFilter.java:82) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.context.SecurityContextHolderFilter.doFilter(SecurityContextHolderFilter.java:69) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:62) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:227) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.session.DisableEncodeUrlFilter.doFilterInternal(DisableEncodeUrlFilter.java:42) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.2.1.jar:6.2.1]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:240) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$0(ObservationFilterChainDecorator.java:323) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:224) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:137) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:233) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:191) ~[spring-security-web-6.4.2.jar:6.4.2]
	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113) ~[spring-web-6.2.1.jar:6.2.1]
	at org.springframework.web.servlet.handler.HandlerMappingIntrospector.lambda$createCacheFilter$3(HandlerMappingIntrospector.java:243) ~[spring-webmvc-6.2.1.jar:6.2.1]
	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113) ~[spring-web-6.2.1.jar:6.2.1]
	at org.springframework.web.filter.CompositeFilter.doFilter(CompositeFilter.java:74) ~[spring-web-6.2.1.jar:6.2.1]
	at org.springframework.security.config.annotation.web.configuration.WebMvcSecurityConfiguration$CompositeFilterChainProxy.doFilter(WebMvcSecurityConfiguration.java:238) ~[spring-security-config-6.4.2.jar:6.4.2]
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:362) ~[spring-web-6.2.1.jar:6.2.1]
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:278) ~[spring-web-6.2.1.jar:6.2.1]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-6.2.1.jar:6.2.1]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.2.1.jar:6.2.1]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-6.2.1.jar:6.2.1]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.2.1.jar:6.2.1]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.springframework.web.filter.ServerHttpObservationFilter.doFilterInternal(ServerHttpObservationFilter.java:114) ~[spring-web-6.2.1.jar:6.2.1]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.2.1.jar:6.2.1]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-6.2.1.jar:6.2.1]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.2.1.jar:6.2.1]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:483) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:397) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:905) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1741) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1190) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63) ~[tomcat-embed-core-10.1.34.jar:10.1.34]
	at java.base/java.lang.Thread.run(Thread.java:1583) ~[na:na]
Suggest a fix

I think the default behaviour should stay as is and MultiPart file should only be enabled via configuration.

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the kotlin-spring generator change introduced by commit e131d52ad00a77b6e2394debb47289ab86cebce and reproduce it using the provided API declaration, Maven plugin configuration, and TypeScript request. Compare generated server signatures before and after v7.10.0; done when the upload request populates the body without the reported NullPointerException while existing clients remain compatible.

Written by the indexing model from the issue text.

Assessment

Tech stack
kotlin, spring-boot, typescript
Domain
api, backend
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Mostly clear
Newbie friendliness
46/100

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