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Spring Data Rest: Exception while generating api doc with inheritance - NullPointerException: Cannot invoke "String.substring(int)" #1095

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mathias-ewald opened this issue Mar 8, 2021 · 3 comments
Closed

Spring Data Rest: Exception while generating api doc with inheritance - NullPointerException: Cannot invoke "String.substring(int)" #1095

mathias-ewald opened this issue Mar 8, 2021 · 3 comments
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bug Something isn't working

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@mathias-ewald
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mathias-ewald commented Mar 8, 2021 •
edited
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Describe the bug
When I add inheritance to my data model, a call to /v3/api-docs.yaml throw the following exception:

java.lang.NullPointerException: Cannot invoke "String.substring(int)" because the return value of "io.swagger.v3.oas.models.media.Schema.get$ref()" is null] with root cause

java.lang.NullPointerException: Cannot invoke "String.substring(int)" because the return value of "io.swagger.v3.oas.models.media.Schema.get$ref()" is null
	at org.springdoc.data.rest.utils.SpringDocDataRestUtils.updateResponseSchema(SpringDocDataRestUtils.java:217) ~[springdoc-openapi-data-rest-1.5.6-SNAPSHOT.jar:1.5.6-SNAPSHOT]
	at org.springdoc.data.rest.utils.SpringDocDataRestUtils.lambda$enhanceResponseContent$0(SpringDocDataRestUtils.java:83) ~[springdoc-openapi-data-rest-1.5.6-SNAPSHOT.jar:1.5.6-SNAPSHOT]
	at java.base/java.util.LinkedHashMap.forEach(LinkedHashMap.java:723) ~[na:na]
	at org.springdoc.data.rest.utils.SpringDocDataRestUtils.lambda$enhanceResponseContent$1(SpringDocDataRestUtils.java:83) ~[springdoc-openapi-data-rest-1.5.6-SNAPSHOT.jar:1.5.6-SNAPSHOT]
	at java.base/java.util.LinkedHashMap$LinkedValues.forEach(LinkedHashMap.java:647) ~[na:na]
	at org.springdoc.data.rest.utils.SpringDocDataRestUtils.enhanceResponseContent(SpringDocDataRestUtils.java:72) ~[springdoc-openapi-data-rest-1.5.6-SNAPSHOT.jar:1.5.6-SNAPSHOT]
	at org.springdoc.data.rest.core.DataRestResponseService.buildEntityResponse(DataRestResponseService.java:151) ~[springdoc-openapi-data-rest-1.5.6-SNAPSHOT.jar:1.5.6-SNAPSHOT]
	at org.springdoc.data.rest.core.DataRestOperationService.buildEntityOperation(DataRestOperationService.java:159) ~[springdoc-openapi-data-rest-1.5.6-SNAPSHOT.jar:1.5.6-SNAPSHOT]
	at org.springdoc.data.rest.core.DataRestOperationService.buildOperation(DataRestOperationService.java:129) ~[springdoc-openapi-data-rest-1.5.6-SNAPSHOT.jar:1.5.6-SNAPSHOT]
	at org.springdoc.data.rest.core.DataRestRouterOperationService.buildRouterOperation(DataRestRouterOperationService.java:239) ~[springdoc-openapi-data-rest-1.5.6-SNAPSHOT.jar:1.5.6-SNAPSHOT]
	at org.springdoc.data.rest.core.DataRestRouterOperationService.buildRouterOperationList(DataRestRouterOperationService.java:186) ~[springdoc-openapi-data-rest-1.5.6-SNAPSHOT.jar:1.5.6-SNAPSHOT]
	at org.springdoc.data.rest.core.DataRestRouterOperationService.buildEntityRouterOperationList(DataRestRouterOperationService.java:120) ~[springdoc-openapi-data-rest-1.5.6-SNAPSHOT.jar:1.5.6-SNAPSHOT]
	at org.springdoc.data.rest.SpringRepositoryRestResourceProvider.findControllers(SpringRepositoryRestResourceProvider.java:365) ~[springdoc-openapi-data-rest-1.5.6-SNAPSHOT.jar:1.5.6-SNAPSHOT]
	at org.springdoc.data.rest.SpringRepositoryRestResourceProvider.lambda$getRouterOperations$6(SpringRepositoryRestResourceProvider.java:215) ~[springdoc-openapi-data-rest-1.5.6-SNAPSHOT.jar:1.5.6-SNAPSHOT]
	at org.springframework.data.mapping.model.BasicPersistentEntity.doWithAssociations(BasicPersistentEntity.java:400) ~[spring-data-commons-2.4.5.jar:2.4.5]
	at org.springdoc.data.rest.SpringRepositoryRestResourceProvider.getRouterOperations(SpringRepositoryRestResourceProvider.java:207) ~[springdoc-openapi-data-rest-1.5.6-SNAPSHOT.jar:1.5.6-SNAPSHOT]
	at org.springdoc.webmvc.api.OpenApiResource.getPaths(OpenApiResource.java:221) ~[springdoc-openapi-webmvc-core-1.5.6-SNAPSHOT.jar:1.5.6-SNAPSHOT]
	at org.springdoc.api.AbstractOpenApiResource.getOpenApi(AbstractOpenApiResource.java:287) ~[springdoc-openapi-common-1.5.6-SNAPSHOT.jar:1.5.6-SNAPSHOT]
	at org.springdoc.webmvc.api.OpenApiResource.openapiYaml(OpenApiResource.java:192) ~[springdoc-openapi-webmvc-core-1.5.6-SNAPSHOT.jar:1.5.6-SNAPSHOT]
	at org.springdoc.webmvc.api.OpenApiWebMvcResource.openapiYaml(OpenApiWebMvcResource.java:132) ~[springdoc-openapi-webmvc-core-1.5.6-SNAPSHOT.jar:1.5.6-SNAPSHOT]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) ~[na:na]
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
	at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:197) ~[spring-web-5.3.4.jar:5.3.4]
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:141) ~[spring-web-5.3.4.jar:5.3.4]
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106) ~[spring-webmvc-5.3.4.jar:5.3.4]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:894) ~[spring-webmvc-5.3.4.jar:5.3.4]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.4.jar:5.3.4]
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.4.jar:5.3.4]
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1060) ~[spring-webmvc-5.3.4.jar:5.3.4]
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:962) ~[spring-webmvc-5.3.4.jar:5.3.4]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.4.jar:5.3.4]
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.3.4.jar:5.3.4]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:626) ~[tomcat-embed-core-9.0.43.jar:4.0.FR]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.4.jar:5.3.4]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) ~[tomcat-embed-core-9.0.43.jar:4.0.FR]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.43.jar:9.0.43]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.4.jar:5.3.4]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.4.jar:5.3.4]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.4.jar:5.3.4]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.4.jar:5.3.4]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.4.jar:5.3.4]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.4.jar:5.3.4]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:346) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:887) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1684) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) ~[na:na]
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) ~[na:na]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
	at java.base/java.lang.Thread.run(Thread.java:832) ~[na:na]

To Reproduce
Springboot: 2.4.3
Springdoc: 1.5.6-SNAPSHOT

@Entity
@EqualsAndHashCode(callSuper=false)
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
@Data
@NoArgsConstructor
@RequiredArgsConstructor
@JsonTypeInfo(
  use = JsonTypeInfo.Id.NAME, 
  include = JsonTypeInfo.As.PROPERTY, 
  property = "_type")
@JsonSubTypes({ 
  @Type(value = Dog.class, name = "dog"),
  @Type(value = Cat.class, name = "cat")
})
public class Pet extends BaseEntity {

	@NonNull
	@NotNull
	private String name;
	
	@NonNull
	@ManyToOne
	private Owner owner;
}

@Entity
@Data
@EqualsAndHashCode(callSuper = false)
@AllArgsConstructor
@NoArgsConstructor
public class Dog extends Pet {

	public static enum CoatType { SMOOTH, SHORT, COMBINATION, DOUBLE, HEAVY, SILKY, LONG, CURLY, WIRE, HAIRLESS }

	@Enumerated(EnumType.STRING)
	private CoatType coat;

	@Builder
	public Dog(String name, Owner owner, CoatType coat) {
		super(name, owner);
		this.coat = coat;
	}

}

@Entity
@Data
@EqualsAndHashCode(callSuper = false)
@Builder
@AllArgsConstructor
@NoArgsConstructor
public class Cat extends Pet {

	public static enum CoatType { TABBY, TOROISE, COLORPOINT, BICOLOR, TRICOLOR, SOLID  }
	
	@Enumerated(EnumType.STRING)
	private CoatType coat;

	@Builder
	public Cat(String name, Owner owner, CoatType coat) {
		super(name, owner);
		this.coat = coat;
	}

}

public interface PetRepo extends JpaRepository<Pet, UUID> {

}

The full code to reproduce is available at https://github.com/mathias-ewald/springdoc-data-rest-example/tree/inheritance.

Expected behavior
I expect no exception to show but instead to see a nice and shiny specification of the inheritance model ;)

EDIT
The problem must have been introduced in 1.5.6-SNAPSHOT. When I revert back to 1.5.5 the problem is gone.
@mathias-ewald mathias-ewald changed the title Spring Data Rest: Exception while generating api doc with inheritance Spring Data Rest: Exception while generating api doc with inheritance - NullPointerException: Cannot invoke "String.substring(int)" Mar 9, 2021
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@bnasslahsen bnasslahsen added the bug Something isn't working label Jan 10, 2022
@Manfred73
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I'm getting the same error, but not related to Spring Data Rest.

I have an interface like this:

@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, property = "type")
@JsonSubTypes({
        @JsonSubTypes.Type(value = XPathFilter.class, name = "XPathFilter")
})
public interface Filter {

    boolean matches(String message);
}

and an model implementated like this:

@Builder(toBuilder = true)
@Getter
@Setter
@EqualsAndHashCode(callSuper = true)
@Relation(value = "filter", collectionRelation = "filters")
public class XPathFilter extends RepresentationModel<Channel> implements Filter {

    private final String xpathExpression;

    @JsonCreator
    public XPathFilter(
            @JsonProperty("xpathExpression") String xpathExpression) {
        this.xpathExpression = xpathExpression;
    }

    @Override
    public boolean matches(final String message) {
        // some implementation
    }
}

Using springboot 3.4.1, springdoc-openapi-starter-webmvc-ui 2.8.3, spring-boot-starter-hateoas 3.4.1, springdoc-openapi-ui 1.8.0 and springdoc-openapi-hateoas 1.8.0 dependencies and springdoc-openapi-maven-plugin 1.4 with Java 23.

This throws the following exception during maven build:

java.lang.NullPointerException: Cannot invoke "String.substring(int)" because the return value of "io.swagger.v3.oas.models.media.Schema.get$ref()" is null
	at org.springdoc.core.converters.HateoasLinksConverter.resolve(HateoasLinksConverter.java:74) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at io.swagger.v3.core.converter.ModelConverterContextImpl.resolve(ModelConverterContextImpl.java:97) ~[swagger-core-jakarta-2.2.27.jar:2.2.27]
	at io.swagger.v3.core.jackson.ModelResolver.lambda$resolve$2(ModelResolver.java:739) ~[swagger-core-jakarta-2.2.27.jar:2.2.27]
	at io.swagger.v3.core.jackson.ModelResolver.resolve(ModelResolver.java:348) ~[swagger-core-jakarta-2.2.27.jar:2.2.27]
	at org.springdoc.core.converters.AdditionalModelsConverter.resolve(AdditionalModelsConverter.java:163) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.converters.FileSupportConverter.resolve(FileSupportConverter.java:72) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.converters.ResponseSupportConverter.resolve(ResponseSupportConverter.java:84) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.converters.SchemaPropertyDeprecatingConverter.resolve(SchemaPropertyDeprecatingConverter.java:95) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.converters.PolymorphicModelConverter.resolve(PolymorphicModelConverter.java:135) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.converters.OAS31ModelConverter.resolve(OAS31ModelConverter.java:49) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.converters.CollectionModelContentConverter.resolve(CollectionModelContentConverter.java:84) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.converters.HateoasLinksConverter.resolve(HateoasLinksConverter.java:73) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at io.swagger.v3.core.converter.ModelConverterContextImpl.resolve(ModelConverterContextImpl.java:97) ~[swagger-core-jakarta-2.2.27.jar:2.2.27]
	at io.swagger.v3.core.jackson.ModelResolver.resolve(ModelResolver.java:745) ~[swagger-core-jakarta-2.2.27.jar:2.2.27]
	at org.springdoc.core.converters.AdditionalModelsConverter.resolve(AdditionalModelsConverter.java:163) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.converters.FileSupportConverter.resolve(FileSupportConverter.java:72) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.converters.ResponseSupportConverter.resolve(ResponseSupportConverter.java:84) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.converters.SchemaPropertyDeprecatingConverter.resolve(SchemaPropertyDeprecatingConverter.java:95) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.converters.PolymorphicModelConverter.resolve(PolymorphicModelConverter.java:135) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.converters.OAS31ModelConverter.resolve(OAS31ModelConverter.java:49) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.converters.CollectionModelContentConverter.resolve(CollectionModelContentConverter.java:84) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.converters.HateoasLinksConverter.resolve(HateoasLinksConverter.java:73) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at io.swagger.v3.core.converter.ModelConverterContextImpl.resolve(ModelConverterContextImpl.java:97) ~[swagger-core-jakarta-2.2.27.jar:2.2.27]
	at org.springdoc.core.converters.ResponseSupportConverter.resolve(ResponseSupportConverter.java:76) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.converters.SchemaPropertyDeprecatingConverter.resolve(SchemaPropertyDeprecatingConverter.java:95) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.converters.PolymorphicModelConverter.resolve(PolymorphicModelConverter.java:135) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.converters.OAS31ModelConverter.resolve(OAS31ModelConverter.java:49) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.converters.CollectionModelContentConverter.resolve(CollectionModelContentConverter.java:84) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.converters.HateoasLinksConverter.resolve(HateoasLinksConverter.java:87) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at io.swagger.v3.core.converter.ModelConverterContextImpl.resolve(ModelConverterContextImpl.java:97) ~[swagger-core-jakarta-2.2.27.jar:2.2.27]
	at io.swagger.v3.core.converter.ModelConverters.resolveAsResolvedSchema(ModelConverters.java:192) ~[swagger-core-jakarta-2.2.27.jar:2.2.27]
	at org.springdoc.core.utils.SpringDocAnnotationsUtils.extractSchema(SpringDocAnnotationsUtils.java:136) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.service.GenericResponseService.calculateSchema(GenericResponseService.java:563) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.service.GenericResponseService.buildContent(GenericResponseService.java:541) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.service.GenericResponseService.buildContent(GenericResponseService.java:522) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.service.GenericResponseService.buildApiResponses(GenericResponseService.java:595) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.service.GenericResponseService.buildApiResponses(GenericResponseService.java:476) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.core.service.GenericResponseService.build(GenericResponseService.java:264) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.api.AbstractOpenApiResource.calculatePath(AbstractOpenApiResource.java:612) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.api.AbstractOpenApiResource.calculatePath(AbstractOpenApiResource.java:802) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.webmvc.api.OpenApiResource.lambda$calculatePath$11(OpenApiResource.java:222) ~[springdoc-openapi-starter-webmvc-api-2.8.3.jar:2.8.3]
	at java.base/java.util.Optional.ifPresent(Optional.java:178) ~[na:na]
	at org.springdoc.webmvc.api.OpenApiResource.calculatePath(OpenApiResource.java:203) ~[springdoc-openapi-starter-webmvc-api-2.8.3.jar:2.8.3]
	at org.springdoc.webmvc.api.OpenApiResource.lambda$getPaths$2(OpenApiResource.java:173) ~[springdoc-openapi-starter-webmvc-api-2.8.3.jar:2.8.3]
	at java.base/java.util.Optional.ifPresent(Optional.java:178) ~[na:na]
	at org.springdoc.webmvc.api.OpenApiResource.getPaths(OpenApiResource.java:152) ~[springdoc-openapi-starter-webmvc-api-2.8.3.jar:2.8.3]
	at org.springdoc.api.AbstractOpenApiResource.getOpenApi(AbstractOpenApiResource.java:370) ~[springdoc-openapi-starter-common-2.8.3.jar:2.8.3]
	at org.springdoc.webmvc.api.OpenApiResource.openapiJson(OpenApiResource.java:127) ~[springdoc-openapi-starter-webmvc-api-2.8.3.jar:2.8.3]
	at org.springdoc.webmvc.api.OpenApiWebMvcResource.openapiJson(OpenApiWebMvcResource.java:117) ~[springdoc-openapi-starter-webmvc-api-2.8.3.jar:2.8.3]
	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 org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:257) ~[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.doGet(FrameworkServlet.java:903) ~[spring-webmvc-6.2.1.jar:6.2.1]
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:564) ~[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.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.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:1575) ~[na:na]

@Manfred73
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Update: not sure if this is related to the inheritance stuff though. I have removed the interfaces and inheritance, and directly use the implementation of the XPathFilter in my model class. This still produces the same error.
Maybe it's related to HATEOAS (HateoasLinksConverter)?

@fkjaekel fkjaekel mentioned this issue Feb 11, 2025
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@fkjaekel
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Check this @Manfred73

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@fkjaekel @bnasslahsen @Manfred73 @mathias-ewald