JSON schema fails to render when a list of Enumerated types is introduced into the data model if spring.data.rest.enable-enum-translation=true [DATAREST-1326]

Doug Busley opened DATAREST-1326 and commented

Taking the example from Restbucks, when a collection of elements is added to the Order class as such:

public class Order extends AbstractAggregateRoot {
private final Location location;
 private final LocalDateTime orderedDate;
 private Status status;
 @ElementCollection
 private List<Milk> milks;
// rest of class excluded for brevity 

A GET request to http://localhost:8080/profile/orders with an Accept header set to application/schema+json results in:

{ "cause": null, "message": "class org.springframework.data.rest.webmvc.json.JsonSchema$JsonSchemaProperty cannot be cast to class org.springframework.data.rest.webmvc.json.JsonSchema$EnumProperty (org.springframework.data.rest.webmvc.json.JsonSchema$JsonSchemaProperty and org.springframework.data.rest.webmvc.json.JsonSchema$EnumProperty are in unnamed module of loader 'app')" }

The issue is only present if spring.data.rest.enable-enum-translation=true

Stacktrace from logs:

java.lang.ClassCastException: class org.springframework.data.rest.webmvc.json.JsonSchema$JsonSchemaProperty cannot be cast to class org.springframework.data.rest.webmvc.json.JsonSchema$EnumProperty (org.springframework.data.rest.webmvc.json.JsonSchema$JsonSchemaProperty and org.springframework.data.rest.webmvc.json.JsonSchema$EnumProperty are in unnamed module of loader 'app')java.lang.ClassCastException: class org.springframework.data.rest.webmvc.json.JsonSchema$JsonSchemaProperty cannot be cast to class org.springframework.data.rest.webmvc.json.JsonSchema$EnumProperty (org.springframework.data.rest.webmvc.json.JsonSchema$JsonSchemaProperty and org.springframework.data.rest.webmvc.json.JsonSchema$EnumProperty are in unnamed module of loader 'app') at org.springframework.data.rest.webmvc.json.JacksonSerializers$EnumTranslatingSerializer.customize(JacksonSerializers.java:120) ~[spring-data-rest-webmvc-3.1.2.RELEASE.jar:3.1.2.RELEASE] at org.springframework.data.rest.webmvc.json.PersistentEntityToJsonSchemaConverter$JsonSchemaPropertyRegistrar.register(PersistentEntityToJsonSchemaConverter.java:338) ~[spring-data-rest-webmvc-3.1.2.RELEASE.jar:3.1.2.RELEASE] at org.springframework.data.rest.webmvc.json.PersistentEntityToJsonSchemaConverter.lambda$null$2(PersistentEntityToJsonSchemaConverter.java:256) ~[spring-data-rest-webmvc-3.1.2.RELEASE.jar:3.1.2.RELEASE] at java.base/java.util.Optional.ifPresent(Optional.java:183) ~[na:na] at org.springframework.data.util.Optionals.ifPresentOrElse(Optionals.java:208) ~[spring-data-commons-2.1.2.RELEASE.jar:2.1.2.RELEASE] at org.springframework.data.rest.webmvc.json.PersistentEntityToJsonSchemaConverter.lambda$getPropertiesFor$4(PersistentEntityToJsonSchemaConverter.java:236) ~[spring-data-rest-webmvc-3.1.2.RELEASE.jar:3.1.2.RELEASE] at java.base/java.util.Optional.map(Optional.java:265) ~[na:na] at org.springframework.data.rest.webmvc.json.PersistentEntityToJsonSchemaConverter.getPropertiesFor(PersistentEntityToJsonSchemaConverter.java:171) ~[spring-data-rest-webmvc-3.1.2.RELEASE.jar:3.1.2.RELEASE] at org.springframework.data.rest.webmvc.json.PersistentEntityToJsonSchemaConverter.convert(PersistentEntityToJsonSchemaConverter.java:160) ~[spring-data-rest-webmvc-3.1.2.RELEASE.jar:3.1.2.RELEASE] at org.springframework.data.rest.webmvc.json.PersistentEntityToJsonSchemaConverter.convert(PersistentEntityToJsonSchemaConverter.java:146) ~[spring-data-rest-webmvc-3.1.2.RELEASE.jar:3.1.2.RELEASE] at org.springframework.data.rest.webmvc.RepositorySchemaController.schema(RepositorySchemaController.java:65) ~[spring-data-rest-webmvc-3.1.2.RELEASE.jar:3.1.2.RELEASE] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[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:566) ~[na:na] at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:215) ~[spring-web-5.1.2.RELEASE.jar:5.1.2.RELEASE] at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:142) ~[spring-web-5.1.2.RELEASE.jar:5.1.2.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:800) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE] at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1038) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:998) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE] at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:890) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:875) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.12.jar:9.0.12] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-5.1.2.RELEASE.jar:5.1.2.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.2.RELEASE.jar:5.1.2.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92) ~[spring-web-5.1.2.RELEASE.jar:5.1.2.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.2.RELEASE.jar:5.1.2.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) ~[spring-web-5.1.2.RELEASE.jar:5.1.2.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.2.RELEASE.jar:5.1.2.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) ~[spring-web-5.1.2.RELEASE.jar:5.1.2.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.2.RELEASE.jar:5.1.2.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:770) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1415) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na] at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.12.jar:9.0.12] at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na] 

Affects: 3.1.3 (Lovelace SR3)

Referenced from: pull request https://github.com/spring-projects/spring-data-rest/pull/375