Affects:
Spring Web 6.0.0-M6 Kotlin 1.7.10
Caused by https://github.com/spring-projects/spring-framework/issues/29068
(De-)Serialization behaviour changed (probably unintentionally when going ) due to a change in how serializer is looked up by spring web framwork, if Kotlin is used. The relevant change happened fixing issue mentioned above. Worked fine in Spring Web 6.0.0-M5 .
Contrary to what the new method name might imply, the call SerializersKt.serializerOrNull(type); does NOT always return null if no valid serializer is found, but might also throw an IllegalArgumentExcepton if the type variable is not an instance of a certain predefined type:
throw IllegalArgumentException("typeToken should be an instance of Class<?>, GenericArray, ParametrizedType or WildcardType, but actual type is $it ${it::class}")
Previously, spring used the SerializersKt.serializer(...) method and caught all exceptions. Now it no longer catches exceptions at the places where SerializersKt.serializerOrNull(type); is used.
Spring doesn't ensure that type is any of these instances before calling SerializersKt.serializerOrNull(type);, therefore this exception will get thrown and not caught (I noticed it in one of my projects when calling the HealthCheck actuator endpoint).
Potential fixes would be to roll back the above change, or still have a try/catch block, but potentially narrowed down to only cover the
SerializersKt.serializerOrNull(type); calls instead.
Comment From: sdeleuze
Could you please share a failing test case?
Comment From: Evenprime
Sure. I've uploaded a minimalistic example to github: https://github.com/Evenprime/springtestcase
It contains only of an empty application and a test case that calls the actuator health endpoint. This results in the following exception stacktrace:
jakarta.servlet.ServletException: Request processing failed: java.lang.IllegalArgumentException: typeToken should be an instance of Class<?>, GenericArray, ParametrizedType or WildcardType, but actual type is org.springframework.core.ResolvableType$EmptyType@b9b97ad class org.springframework.core.ResolvableType$EmptyType (Kotlin reflection is not available)
at app//org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1011)
at app//org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:895)
at app//jakarta.servlet.http.HttpServlet.service(HttpServlet.java:668)
at app//org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:880)
at app//org.springframework.test.web.servlet.TestDispatcherServlet.service(TestDispatcherServlet.java:72)
at app//jakarta.servlet.http.HttpServlet.service(HttpServlet.java:777)
at app//org.springframework.mock.web.MockFilterChain$ServletFilterProxy.doFilter(MockFilterChain.java:165)
at app//org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:132)
at app//org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at app//org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
at app//org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:132)
at app//org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at app//org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
at app//org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:132)
at app//org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:94)
at app//org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
at app//org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:132)
at app//org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at app//org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
at app//org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:132)
at app//org.springframework.test.web.servlet.MockMvc.perform(MockMvc.java:201)
at app//org.springframework.test.web.servlet.MockHttpServletRequestDsl.perform$spring_test(MockHttpServletRequestDsl.kt:207)
at app//org.springframework.test.web.servlet.MockMvcExtensionsKt.get(MockMvcExtensions.kt:32)
at app//org.springframework.test.web.servlet.MockMvcExtensionsKt.get$default(MockMvcExtensions.kt:30)
at app//com.springwebtestcase.ActuatorTest.The health endpoint can be accessed(ActuatorTest.kt:20)
at java.base@17.0.4/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base@17.0.4/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base@17.0.4/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base@17.0.4/java.lang.reflect.Method.invoke(Method.java:568)
at app//org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:727)
at app//org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
at app//org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
at app//org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:156)
at app//org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:147)
at app//org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:86)
at app//org.junit.jupiter.engine.execution.InterceptingExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(InterceptingExecutableInvoker.java:103)
at app//org.junit.jupiter.engine.execution.InterceptingExecutableInvoker.lambda$invoke$0(InterceptingExecutableInvoker.java:93)
at app//org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)
at app//org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)
at app//org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)
at app//org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)
at app//org.junit.jupiter.engine.execution.InterceptingExecutableInvoker.invoke(InterceptingExecutableInvoker.java:92)
at app//org.junit.jupiter.engine.execution.InterceptingExecutableInvoker.invoke(InterceptingExecutableInvoker.java:86)
at app//org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$7(TestMethodTestDescriptor.java:217)
at app//org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at app//org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:213)
at app//org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:138)
at app//org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:68)
at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:151)
at app//org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141)
at app//org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139)
at app//org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138)
at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95)
at java.base@17.0.4/java.util.ArrayList.forEach(ArrayList.java:1511)
at app//org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:41)
at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:155)
at app//org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141)
at app//org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139)
at app//org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138)
at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95)
at java.base@17.0.4/java.util.ArrayList.forEach(ArrayList.java:1511)
at app//org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:41)
at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:155)
at app//org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141)
at app//org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139)
at app//org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138)
at app//org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95)
at app//org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:35)
at app//org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
at app//org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:54)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:107)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:54)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:67)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:52)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:114)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:86)
at org.junit.platform.launcher.core.DefaultLauncherSession$DelegatingLauncher.execute(DefaultLauncherSession.java:86)
at org.junit.platform.launcher.core.SessionPerRequestLauncher.execute(SessionPerRequestLauncher.java:53)
at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor$CollectAllTestClassesExecutor.processAllTestClasses(JUnitPlatformTestClassProcessor.java:99)
at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor$CollectAllTestClassesExecutor.access$000(JUnitPlatformTestClassProcessor.java:79)
at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor.stop(JUnitPlatformTestClassProcessor.java:75)
at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.stop(SuiteTestClassProcessor.java:61)
at java.base@17.0.4/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base@17.0.4/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base@17.0.4/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base@17.0.4/java.lang.reflect.Method.invoke(Method.java:568)
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33)
at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:94)
at jdk.proxy1/jdk.proxy1.$Proxy2.stop(Unknown Source)
at org.gradle.api.internal.tasks.testing.worker.TestWorker$3.run(TestWorker.java:193)
at org.gradle.api.internal.tasks.testing.worker.TestWorker.executeAndMaintainThreadName(TestWorker.java:129)
at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:100)
at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:60)
at org.gradle.process.internal.worker.child.ActionExecutionWorker.execute(ActionExecutionWorker.java:56)
at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:133)
at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:71)
at app//worker.org.gradle.process.internal.worker.GradleWorkerMain.run(GradleWorkerMain.java:69)
at app//worker.org.gradle.process.internal.worker.GradleWorkerMain.main(GradleWorkerMain.java:74)
Caused by: java.lang.IllegalArgumentException: typeToken should be an instance of Class<?>, GenericArray, ParametrizedType or WildcardType, but actual type is org.springframework.core.ResolvableType$EmptyType@b9b97ad class org.springframework.core.ResolvableType$EmptyType (Kotlin reflection is not available)
at kotlinx.serialization.SerializersKt__SerializersJvmKt.serializerByJavaTypeImpl$SerializersKt__SerializersJvmKt(SerializersJvm.kt:127)
at kotlinx.serialization.SerializersKt__SerializersJvmKt.serializerOrNull(SerializersJvm.kt:76)
at kotlinx.serialization.SerializersKt.serializerOrNull(Unknown Source)
at kotlinx.serialization.SerializersKt__SerializersJvmKt.serializerOrNull(SerializersJvm.kt:43)
at kotlinx.serialization.SerializersKt.serializerOrNull(Unknown Source)
at org.springframework.http.converter.json.KotlinSerializationJsonHttpMessageConverter.serializer(KotlinSerializationJsonHttpMessageConverter.java:176)
at org.springframework.http.converter.json.KotlinSerializationJsonHttpMessageConverter.canWrite(KotlinSerializationJsonHttpMessageConverter.java:99)
at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:286)
at org.springframework.web.servlet.mvc.method.annotation.HttpEntityMethodProcessor.handleReturnValue(HttpEntityMethodProcessor.java:238)
at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:78)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:135)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:898)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:810)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1075)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:968)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1003)
... 109 more
The same can be observed when starting the application and querying the endpoint /actuator/health directly:
2022-09-23T16:32:59.123+02:00 ERROR 5291 --- [nio-8080-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: java.lang.IllegalArgumentException: typeToken should be an instance of Class<?>, GenericArray, ParametrizedType or WildcardType, but actual type is org.springframework.core.ResolvableType$EmptyType@4e6ab5bc class org.springframework.core.ResolvableType$EmptyType (Kotlin reflection is not available)] with root cause
java.lang.IllegalArgumentException: typeToken should be an instance of Class<?>, GenericArray, ParametrizedType or WildcardType, but actual type is org.springframework.core.ResolvableType$EmptyType@4e6ab5bc class org.springframework.core.ResolvableType$EmptyType (Kotlin reflection is not available)
at kotlinx.serialization.SerializersKt__SerializersJvmKt.serializerByJavaTypeImpl$SerializersKt__SerializersJvmKt(SerializersJvm.kt:127) ~[kotlinx-serialization-core-jvm-1.4.0.jar:1.4.0]
at kotlinx.serialization.SerializersKt__SerializersJvmKt.serializerOrNull(SerializersJvm.kt:76) ~[kotlinx-serialization-core-jvm-1.4.0.jar:1.4.0]
at kotlinx.serialization.SerializersKt.serializerOrNull(Unknown Source) ~[kotlinx-serialization-core-jvm-1.4.0.jar:1.4.0]
at kotlinx.serialization.SerializersKt__SerializersJvmKt.serializerOrNull(SerializersJvm.kt:43) ~[kotlinx-serialization-core-jvm-1.4.0.jar:1.4.0]
at kotlinx.serialization.SerializersKt.serializerOrNull(Unknown Source) ~[kotlinx-serialization-core-jvm-1.4.0.jar:1.4.0]
at org.springframework.http.converter.json.KotlinSerializationJsonHttpMessageConverter.serializer(KotlinSerializationJsonHttpMessageConverter.java:176) ~[spring-web-6.0.0-M6.jar:6.0.0-M6]
at org.springframework.http.converter.json.KotlinSerializationJsonHttpMessageConverter.canWrite(KotlinSerializationJsonHttpMessageConverter.java:99) ~[spring-web-6.0.0-M6.jar:6.0.0-M6]
at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:286) ~[spring-webmvc-6.0.0-M6.jar:6.0.0-M6]
at org.springframework.web.servlet.mvc.method.annotation.HttpEntityMethodProcessor.handleReturnValue(HttpEntityMethodProcessor.java:238) ~[spring-webmvc-6.0.0-M6.jar:6.0.0-M6]
at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:78) ~[spring-web-6.0.0-M6.jar:6.0.0-M6]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:135) ~[spring-webmvc-6.0.0-M6.jar:6.0.0-M6]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:898) ~[spring-webmvc-6.0.0-M6.jar:6.0.0-M6]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:810) ~[spring-webmvc-6.0.0-M6.jar:6.0.0-M6]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-6.0.0-M6.jar:6.0.0-M6]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1075) ~[spring-webmvc-6.0.0-M6.jar:6.0.0-M6]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:968) ~[spring-webmvc-6.0.0-M6.jar:6.0.0-M6]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1003) ~[spring-webmvc-6.0.0-M6.jar:6.0.0-M6]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:895) ~[spring-webmvc-6.0.0-M6.jar:6.0.0-M6]
at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:668) ~[tomcat-embed-core-10.0.23.jar:5.0.0]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:880) ~[spring-webmvc-6.0.0-M6.jar:6.0.0-M6]
at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:777) ~[tomcat-embed-core-10.0.23.jar:5.0.0]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:223) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-10.0.23.jar:10.0.23]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-6.0.0-M6.jar:6.0.0-M6]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.0-M6.jar:6.0.0-M6]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-6.0.0-M6.jar:6.0.0-M6]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.0-M6.jar:6.0.0-M6]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:94) ~[spring-boot-actuator-3.0.0-M5.jar:3.0.0-M5]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.0-M6.jar:6.0.0-M6]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-6.0.0-M6.jar:6.0.0-M6]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.0-M6.jar:6.0.0-M6]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:119) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:356) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:867) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1762) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-10.0.23.jar:10.0.23]
at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]
Downgrading to Spring Boot version 3.0.0-M4 (and therefore Spring Web 6.0.0-M5) fixes the issue, the endpoint properly returns Status 200 "UP" instead of throwing an exception and returning Status 500.