HttpMessageNotWritableException when serializing Nested Projections using FluentQuery (findBy with as())

[alihsan-tsdln]

Body:

{
    "timestamp": "2025-12-11T13:08:25.411Z",
    "status": 500,
    "error": "Internal Server Error",
    "trace": "org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: Invalid property 'decoratedClass' of bean class [com.onderp.onderp.company.entity.TblCompany]: Could not find field for property during fallback access\r\n\tat org.springframework.http.converter.AbstractJacksonHttpMessageConverter.writeInternal(AbstractJacksonHttpMessageConverter.java:447)\r\n\tat org.springframework.http.converter.AbstractSmartHttpMessageConverter.write(AbstractSmartHttpMessageConverter.java:118)\r\n\tat org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:343)\r\n\tat org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:207)\r\n\tat org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:78)\r\n\tat org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:135)\r\n\tat org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:934)\r\n\tat org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:853)\r\n\tat org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:86)\r\n\tat org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)\r\n\tat org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:866)\r\n\tat org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1003)\r\n\tat org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:892)\r\n\tat jakarta.servlet.http.HttpServlet.service(HttpServlet.java:622)\r\n\tat org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:874)\r\n\tat jakarta.servlet.http.HttpServlet.service(HttpServlet.java:710)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:128)\r\n\tat org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107)\r\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:110)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107)\r\n\tat org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:108)\r\n\tat org.springframework.security.web.FilterChainProxy.lambda$doFilterInternal$3(FilterChainProxy.java:235)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$FilterObservation$SimpleFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:493)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:354)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator.lambda$wrapSecured$0(ObservationFilterChainDecorator.java:86)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:132)\r\n\tat org.springframework.security.web.access.intercept.AuthorizationFilter.doFilter(AuthorizationFilter.java:101)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141)\r\n\tat org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:126)\r\n\tat org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:120)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141)\r\n\tat org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:132)\r\n\tat org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:86)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141)\r\n\tat org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:100)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141)\r\n\tat org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:181)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141)\r\n\tat org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141)\r\n\tat com.onderp.onderp.login.config.JwtAuthenticationFilter.doFilterInternal(JwtAuthenticationFilter.java:72)\r\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141)\r\n\tat org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110)\r\n\tat org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:96)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141)\r\n\tat org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90)\r\n\tat org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75)\r\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141)\r\n\tat org.springframework.security.web.context.SecurityContextHolderFilter.doFilter(SecurityContextHolderFilter.java:82)\r\n\tat org.springframework.security.web.context.SecurityContextHolderFilter.doFilter(SecurityContextHolderFilter.java:69)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141)\r\n\tat org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:62)\r\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141)\r\n\tat org.springframework.security.web.session.DisableEncodeUrlFilter.doFilterInternal(DisableEncodeUrlFilter.java:42)\r\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$0(ObservationFilterChainDecorator.java:337)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:228)\r\n\tat org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141)\r\n\tat org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:237)\r\n\tat org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:195)\r\n\tat org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)\r\n\tat org.springframework.web.filter.ServletRequestPathFilter.doFilter(ServletRequestPathFilter.java:52)\r\n\tat org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)\r\n\tat org.springframework.web.filter.CompositeFilter.doFilter(CompositeFilter.java:74)\r\n\tat org.springframework.security.config.annotation.web.configuration.WebSecurityConfiguration$CompositeFilterChainProxy.doFilter(WebSecurityConfiguration.java:317)\r\n\tat org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:355)\r\n\tat org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:272)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107)\r\n\tat org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)\r\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107)\r\n\tat org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)\r\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107)\r\n\tat org.springframework.web.filter.ServerHttpObservationFilter.doFilterInternal(ServerHttpObservationFilter.java:110)\r\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107)\r\n\tat org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:199)\r\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)\r\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107)\r\n\tat org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:165)\r\n\tat org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:77)\r\n\tat org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482)\r\n\tat org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:113)\r\n\tat org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:83)\r\n\tat org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:72)\r\n\tat org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:341)\r\n\tat org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:397)\r\n\tat org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)\r\n\tat org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:903)\r\n\tat org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1778)\r\n\tat org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)\r\n\tat org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:946)\r\n\tat org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:480)\r\n\tat org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:57)\r\n\tat java.base/java.lang.Thread.run(Thread.java:1474)\r\nCaused by: tools.jackson.databind.DatabindException: Invalid property 'decoratedClass' of bean class [com.onderp.onderp.company.entity.TblCompany]: Could not find field for property during fallback access\n at [No location information] (through reference chain: com.onderp.onderp.generic.GenericResponse[\"content\"]->java.util.Collections$UnmodifiableRandomAccessList[0]->jdk.proxy4.$Proxy233[\"defaultCompany\"]->jdk.proxy4.$Proxy234[\"decoratedClass\"])\r\n\tat tools.jackson.databind.DatabindException.wrapWithPath(DatabindException.java:132)\r\n\tat tools.jackson.databind.ser.std.StdSerializer.wrapAndThrow(StdSerializer.java:275)\r\n\tat tools.jackson.databind.ser.UnrolledBeanSerializer.serializeNonFiltered(UnrolledBeanSerializer.java:215)\r\n\tat tools.jackson.databind.ser.UnrolledBeanSerializer.serialize(UnrolledBeanSerializer.java:179)\r\n\tat tools.jackson.databind.ser.BeanPropertyWriter.serializeAsProperty(BeanPropertyWriter.java:608)\r\n\tat tools.jackson.databind.ser.bean.BeanSerializerBase._serializePropertiesNoView(BeanSerializerBase.java:747)\r\n\tat tools.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:171)\r\n\tat tools.jackson.databind.ser.jdk.IndexedListSerializer.serializeContents(IndexedListSerializer.java:118)\r\n\tat tools.jackson.databind.ser.jdk.IndexedListSerializer.serialize(IndexedListSerializer.java:79)\r\n\tat tools.jackson.databind.ser.BeanPropertyWriter.serializeAsProperty(BeanPropertyWriter.java:608)\r\n\tat tools.jackson.databind.ser.UnrolledBeanSerializer.serializeNonFiltered(UnrolledBeanSerializer.java:206)\r\n\tat tools.jackson.databind.ser.UnrolledBeanSerializer.serialize(UnrolledBeanSerializer.java:179)\r\n\tat tools.jackson.databind.ser.SerializationContextExt._serialize(SerializationContextExt.java:456)\r\n\tat tools.jackson.databind.ser.SerializationContextExt.serializeValue(SerializationContextExt.java:308)\r\n\tat tools.jackson.databind.ObjectWriter$Prefetch.serialize(ObjectWriter.java:1365)\r\n\tat tools.jackson.databind.ObjectWriter.writeValue(ObjectWriter.java:973)\r\n\tat org.springframework.http.converter.AbstractJacksonHttpMessageConverter.writeInternal(AbstractJacksonHttpMessageConverter.java:439)\r\n\t... 122 more\r\nCaused by: org.springframework.beans.NotReadablePropertyException: Invalid property 'decoratedClass' of bean class [com.onderp.onderp.company.entity.TblCompany]: Could not find field for property during fallback access\r\n\tat org.springframework.data.util.DirectFieldAccessFallbackBeanWrapper.getPropertyValue(DirectFieldAccessFallbackBeanWrapper.java:55)\r\n\tat org.springframework.data.projection.PropertyAccessingMethodInterceptor.invoke(PropertyAccessingMethodInterceptor.java:72)\r\n\tat org.springframework.data.projection.ProjectingMethodInterceptor.invoke(ProjectingMethodInterceptor.java:75)\r\n\tat org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)\r\n\tat org.springframework.data.projection.ProxyProjectionFactory$TargetAwareMethodInterceptor.invoke(ProxyProjectionFactory.java:252)\r\n\tat org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)\r\n\tat org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:222)\r\n\tat jdk.proxy4/jdk.proxy4.$Proxy234.getDecoratedClass(Unknown Source)\r\n\tat tools.jackson.databind.ser.BeanPropertyWriter.get(BeanPropertyWriter.java:750)\r\n\tat tools.jackson.databind.ser.BeanPropertyWriter.serializeAsProperty(BeanPropertyWriter.java:564)\r\n\tat tools.jackson.databind.ser.UnrolledBeanSerializer.serializeNonFiltered(UnrolledBeanSerializer.java:197)\r\n\t... 136 more\r\n",
    "message": "Could not write JSON: Invalid property 'decoratedClass' of bean class [com.onderp.onderp.company.entity.TblCompany]: Could not find field for property during fallback access",
    "path": "/api/person"
}

Description
I am encountering a HttpMessageNotWritableException (caused by NotReadablePropertyException) when trying to serialize a JSON response containing a Spring Data JPA projection.

This occurs specifically when:

1. Using JpaSpecificationExecutor.findBy with the Fluent API (q -> q.as(View.class)).
2. The Root Projection (EmployeeView) contains a Nested Projection (DepartmentView).
3. The result is returned directly to the controller for Jackson serialization.

It seems Jackson treats internal proxy methods (like getDecoratedClass exposed by the proxy mechanism) as valid properties to serialize. When it tries to access this property via DirectFieldAccessFallbackBeanWrapper, it fails because the underlying Entity does not have a decoratedClass field.

1. The Entities Simple parent-child relationship.

package com.example.demo.entity;

@Entity
public class Department {
    @Id
    private UUID id;
    private String name;
    // getters and setters
}

@Entity
public class Employee {
    @Id
    private UUID id;
    private String name;
    
    @ManyToOne(fetch = FetchType.LAZY)
    private Department department;
    // getters and setters
}

2. The Projections (Interfaces) Using closed projections.

package com.example.demo.dto;

public interface DepartmentView {
    String getId();
    String getName();
}

public interface EmployeeView {
    UUID getId();
    String getName();
    // Nested projection causing the issue
    DepartmentView getDepartment();
}

3. The Service / Repository Call Using JpaSpecificationExecutor and Fluent API.

public Page<EmployeeView> searchEmployees(FilterRequest request) {
    Pageable pageable = request.buildPageRequest();
    
    // Usage of Fluent API with .as()
    return repository.findBy(
            specification, 
            q -> q.as(EmployeeView.class).page(pageable)
    );
}

Environment

• Spring Boot Version: 4.0.0
• Spring Data JPA Version: 4.0.0
• Java Version: 25

Stack Trace :

org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: Invalid property 'decoratedClass' of bean class [com.onderp.onderp.company.entity.TblCompany]: Could not find field for property during fallback access\r\n\tat 
org.springframework.http.converter.AbstractJacksonHttpMessageConverter.writeInternal(AbstractJacksonHttpMessageConverter.java:447)\r\n\tat 
org.springframework.http.converter.AbstractSmartHttpMessageConverter.write(AbstractSmartHttpMessageConverter.java:118)\r\n\tat 
org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:343)\r\n\tat 
org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:207)\r\n\tat 
org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:78)\r\n\tat 
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:135)\r\n\tat 
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:934)\r\n\tat 
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:853)\r\n\tat
 org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:86)\r\n\tat 
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)\r\n\tat 
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:866)\r\n\tat 
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1003)\r\n\tat 
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:892)\r\n\tat 
jakarta.servlet.http.HttpServlet.service(HttpServlet.java:622)\r\n\tat 
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:874)\r\n\tat 
jakarta.servlet.http.HttpServlet.service(HttpServlet.java:710)\r\n\tat 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:128)\r\n\tat 
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)\r\n\tat 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107)\r\n\tat 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:110)\r\n\tat 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107)\r\n\tat 
org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:108)\r\n\tat 
org.springframework.security.web.FilterChainProxy.lambda$doFilterInternal$3(FilterChainProxy.java:235)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$FilterObservation$SimpleFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:493)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:354)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator.lambda$wrapSecured$0(ObservationFilterChainDecorator.java:86)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:132)\r\n\tat 
org.springframework.security.web.access.intercept.AuthorizationFilter.doFilter(AuthorizationFilter.java:101)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141)\r\n\tat 
org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:126)\r\n\tat 
org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:120)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141)\r\n\tat 
org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:132)\r\n\tat 
org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:86)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244)\r\n\tat
 org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141)\r\n\tat 
org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:100)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141)\r\n\tat 
org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:181)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141)\r\n\tat 
org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141)\r\n\tat 
com.onderp.onderp.login.config.JwtAuthenticationFilter.doFilterInternal(JwtAuthenticationFilter.java:72)\r\n\tat 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141)\r\n\tat 
org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110)\r\n\tat 
org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:96)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244)\r\n\tat
 org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141)\r\n\tat 
org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90)\r\n\tat 
org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75)\r\n\tat 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141)\r\n\tat 
org.springframework.security.web.context.SecurityContextHolderFilter.doFilter(SecurityContextHolderFilter.java:82)\r\n\tat 
org.springframework.security.web.context.SecurityContextHolderFilter.doFilter(SecurityContextHolderFilter.java:69)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141)\r\n\tat 
org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:62)\r\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141)\r\n\tat 
org.springframework.security.web.session.DisableEncodeUrlFilter.doFilterInternal(DisableEncodeUrlFilter.java:42)\r\n\tat 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$0(ObservationFilterChainDecorator.java:337)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:228)\r\n\tat 
org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141)\r\n\tat 
org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:237)\r\n\tat 
org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:195)\r\n\tat 
org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)\r\n\tat 
org.springframework.web.filter.ServletRequestPathFilter.doFilter(ServletRequestPathFilter.java:52)\r\n\tat 
org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113)\r\n\tat 
org.springframework.web.filter.CompositeFilter.doFilter(CompositeFilter.java:74)\r\n\tat 
org.springframework.security.config.annotation.web.configuration.WebSecurityConfiguration$CompositeFilterChainProxy.doFilter(WebSecurityConfiguration.java:317)\r\n\tat
 org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:355)\r\n\tat 
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:272)\r\n\tat 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107)\r\n\tat 
org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)\r\n\tat 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)\r\n\tat 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107)\r\n\tat 
org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)\r\n\tat 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)\r\n\tat 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107)\r\n\tat 
org.springframework.web.filter.ServerHttpObservationFilter.doFilterInternal(ServerHttpObservationFilter.java:110)\r\n\tat 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)\r\n\tat 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107)\r\n\tat 
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:199)\r\n\tat 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)\r\n\tat 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107)\r\n\tat 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:165)\r\n\tat 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:77)\r\n\tat 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482)\r\n\tat 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:113)\r\n\tat 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:83)\r\n\tat 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:72)\r\n\tat 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:341)\r\n\tat 
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:397)\r\n\tat 
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)\r\n\tat 
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:903)\r\n\tat 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1778)\r\n\tat 
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)\r\n\tat 
org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:946)\r\n\tat 
org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:480)\r\n\tat 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:57)\r\n\tat 
java.base/java.lang.Thread.run(Thread.java:1474)\r\nCaused by: tools.jackson.databind.DatabindException: Invalid property 'decoratedClass' of bean class [com.onderp.onderp.company.entity.TblCompany]: Could not find field for property during fallback access\n at [No location information] (through reference chain: com.onderp.onderp.generic.GenericResponse[\"content\"]->java.util.Collections$UnmodifiableRandomAccessList[0]->jdk.proxy4.$Proxy233[\"defaultCompany\"]->jdk.proxy4.$Proxy234[\"decoratedClass\"])\r\n\tat 
tools.jackson.databind.DatabindException.wrapWithPath(DatabindException.java:132)\r\n\tat 
tools.jackson.databind.ser.std.StdSerializer.wrapAndThrow(StdSerializer.java:275)\r\n\tat 
tools.jackson.databind.ser.UnrolledBeanSerializer.serializeNonFiltered(UnrolledBeanSerializer.java:215)\r\n\tat 
tools.jackson.databind.ser.UnrolledBeanSerializer.serialize(UnrolledBeanSerializer.java:179)\r\n\tat 
tools.jackson.databind.ser.BeanPropertyWriter.serializeAsProperty(BeanPropertyWriter.java:608)\r\n\tat 
tools.jackson.databind.ser.bean.BeanSerializerBase._serializePropertiesNoView(BeanSerializerBase.java:747)\r\n\tat 
tools.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:171)\r\n\tat 
tools.jackson.databind.ser.jdk.IndexedListSerializer.serializeContents(IndexedListSerializer.java:118)\r\n\tat 
tools.jackson.databind.ser.jdk.IndexedListSerializer.serialize(IndexedListSerializer.java:79)\r\n\tat 
tools.jackson.databind.ser.BeanPropertyWriter.serializeAsProperty(BeanPropertyWriter.java:608)\r\n\tat 
tools.jackson.databind.ser.UnrolledBeanSerializer.serializeNonFiltered(UnrolledBeanSerializer.java:206)\r\n\tat 
tools.jackson.databind.ser.UnrolledBeanSerializer.serialize(UnrolledBeanSerializer.java:179)\r\n\tat 
tools.jackson.databind.ser.SerializationContextExt._serialize(SerializationContextExt.java:456)\r\n\tat 
tools.jackson.databind.ser.SerializationContextExt.serializeValue(SerializationContextExt.java:308)\r\n\tat 
tools.jackson.databind.ObjectWriter$Prefetch.serialize(ObjectWriter.java:1365)\r\n\tat 
tools.jackson.databind.ObjectWriter.writeValue(ObjectWriter.java:973)\r\n\tat 
org.springframework.http.converter.AbstractJacksonHttpMessageConverter.writeInternal(AbstractJacksonHttpMessageConverter.java:439)\r\n\t...122 more\r\n
Caused by: org.springframework.beans.NotReadablePropertyException: Invalid property 'decoratedClass' of bean class [com.onderp.onderp.company.entity.TblCompany]: Could not find field for property during fallback access\r\n\tat 
org.springframework.data.util.DirectFieldAccessFallbackBeanWrapper.getPropertyValue(DirectFieldAccessFallbackBeanWrapper.java:55)\r\n\tat 
org.springframework.data.projection.PropertyAccessingMethodInterceptor.invoke(PropertyAccessingMethodInterceptor.java:72)\r\n\tat 
org.springframework.data.projection.ProjectingMethodInterceptor.invoke(ProjectingMethodInterceptor.java:75)\r\n\tat 
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)\r\n\tat 
org.springframework.data.projection.ProxyProjectionFactory$TargetAwareMethodInterceptor.invoke(ProxyProjectionFactory.java:252)\r\n\tat 
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)\r\n\tat 
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:222)\r\n\tat 
jdk.proxy4/jdk.proxy4.$Proxy234.getDecoratedClass(Unknown Source)\r\n\tat 
tools.jackson.databind.ser.BeanPropertyWriter.get(BeanPropertyWriter.java:750)\r\n\tat 
tools.jackson.databind.ser.BeanPropertyWriter.serializeAsProperty(BeanPropertyWriter.java:564)\r\n\tat 
tools.jackson.databind.ser.UnrolledBeanSerializer.serializeNonFiltered(UnrolledBeanSerializer.java:197)\r\n\t... 136 more\r\n

[mp911de]

This is due to some changes within Jackson. We've reported an issue against Jackson via FasterXML/jackson-databind#5416. Jackson 3 has changed how it handles JDK proxies and this looks like a variant. Can you test against the latest Jackson 3 snapshots to check whether the issue has been addressed?

The problem is that Jackson considers all interface methods that follow the bean spec (e.g. getDecoratedClass()) as properties and there isn't really anything we can do (i.e. remove proxy infrastructure methods).

[alihsan-tsdln]

@mp911de Thanks for the assistance! Overriding the Jackson BOM to version 3.0.3 resolved the issue for me.

<properties>
    <java.version>25</java.version>
    ...
    <jackson-bom.version>3.0.3</jackson-bom.version>
</properties>

I see this has already been addressed in Spring Boot Issue #48462 and will be officially fixed in the Spring Boot 4.0.1 release.

[mp911de]

Thanks a lot for verifying, closing the ticket here as it has been solved.