Rest Docs 관련 문의 드립니다

본 강의를 듣고 다른 프로젝트에 Rest Docs를 적용해보고 있는데, 적용 도중 몇가지 문의 사항이 있습니다.

1. List의 각 요소에 self 링크 넣는 방법

강의 내용중에 Page의 각 요소에 PageResourcesAssembler를 이용해서 self 링크를 넣는 내용이 있었는데, Page가 아닌 List로 리턴하는 메소드에서를 어떻게 구현해야 될까요?

2. Resource 클래스를 상속한 클래스의 리턴시 에러 발생

Resource 클래스를 상속해서 링크를 생성해주는 클래스를 만들었습니다. 그리고 그 클래스를 리턴하게 했는데, 테스트에서는 통과가 되는데 실제 API 호출을 할 때는 에러가 발생합니다. 어떤 부분이 문제인지 문의드립니다.

<에러 내용>

org.springframework.http.converter.HttpMessageConversionException: Could not instantiate JAXBContext for class [class link.myrecipes.api.common.RestResource]: Implementation of JAXB-API has not been found on module path or classpath.; nested exception is javax.xml.bind.JAXBException: Implementation of JAXB-API has not been found on module path or classpath.

 - with linked exception:

[java.lang.ClassNotFoundException: com.sun.xml.internal.bind.v2.ContextFactory]

 at org.springframework.http.converter.xml.AbstractJaxb2HttpMessageConverter.getJaxbContext(AbstractJaxb2HttpMessageConverter.java:117) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at org.springframework.http.converter.xml.AbstractJaxb2HttpMessageConverter.createMarshaller(AbstractJaxb2HttpMessageConverter.java:51) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at org.springframework.http.converter.xml.Jaxb2RootElementHttpMessageConverter.writeToResult(Jaxb2RootElementHttpMessageConverter.java:180) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at org.springframework.http.converter.xml.AbstractXmlHttpMessageConverter.writeInternal(AbstractXmlHttpMessageConverter.java:84) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:227) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:293) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at org.springframework.web.servlet.mvc.method.annotation.HttpEntityMethodProcessor.handleReturnValue(HttpEntityMethodProcessor.java:225) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:82) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:122) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:892) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1039) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.22.jar:9.0.22]

 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:118) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:118) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:118) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:118) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:853) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1587) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 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-9.0.22.jar:9.0.22]

 at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]

Caused by: javax.xml.bind.JAXBException: Implementation of JAXB-API has not been found on module path or classpath.

 at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:278) ~[jaxb-api-2.3.1.jar:2.3.0]

 at javax.xml.bind.ContextFinder.find(ContextFinder.java:421) ~[jaxb-api-2.3.1.jar:2.3.0]

 at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:721) ~[jaxb-api-2.3.1.jar:2.3.0]

 at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:662) ~[jaxb-api-2.3.1.jar:2.3.0]

 at org.springframework.http.converter.xml.AbstractJaxb2HttpMessageConverter.getJaxbContext(AbstractJaxb2HttpMessageConverter.java:112) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]

 ... 55 common frames omitted

Caused by: java.lang.ClassNotFoundException: com.sun.xml.internal.bind.v2.ContextFactory

 at org.springframework.boot.web.embedded.tomcat.TomcatEmbeddedWebappClassLoader.loadClass(TomcatEmbeddedWebappClassLoader.java:68) ~[spring-boot-2.1.7.RELEASE.jar:2.1.7.RELEASE]

 at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1188) ~[tomcat-embed-core-9.0.22.jar:9.0.22]

 at javax.xml.bind.ServiceLoaderUtil.nullSafeLoadClass(ServiceLoaderUtil.java:122) ~[jaxb-api-2.3.1.jar:2.3.0]

 at javax.xml.bind.ServiceLoaderUtil.safeLoadClass(ServiceLoaderUtil.java:155) ~[jaxb-api-2.3.1.jar:2.3.0]

 at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:276) ~[jaxb-api-2.3.1.jar:2.3.0]

 ... 59 common frames omitted

<클래스 코드>

public class RestResource<T> extends Resource<T> {
    public RestResource(T content, String key, Class<?> controllerClass, LinkType[] addLinks, String linkPrefix, Link... links) {
        super(content, links);
        add(linkTo(controllerClass).slash(key).withSelfRel());

        List<LinkType> addLinkList = Arrays.asList(addLinks);
        if (addLinkList.contains(LinkType.CREATE)) {
            add(linkTo(controllerClass).withRel(linkPrefix + "-create"));
        }
        if (addLinkList.contains(LinkType.READ)) {
            add(linkTo(controllerClass).withRel(linkPrefix + "-read"));
        }
        if (addLinkList.contains(LinkType.UPDATE)) {
            add(linkTo(controllerClass).withRel(linkPrefix + "-update"));
        }
        if (addLinkList.contains(LinkType.DELETE)) {
            add(linkTo(controllerClass).withRel(linkPrefix + "-delete"));
        }
        if (addLinkList.contains(LinkType.QUERY)) {
            add(linkTo(controllerClass).withRel(linkPrefix + "-query"));
        }
    }

    public RestResource(T content, Link... links) {
        super(content, links);
    }

    public void addProfileLink(String profileLink) {
        add(new Link(profileLink).withRel("profile"));
    }

    public Link selfLink() {
        return getLinks("self").get(0);
    }
}