Kotlin 无法将Jooq fetchInto类java.util.LinkedHashMap强制转换为类

给出中给出的最后一个示例

我得到这个错误：

java.lang.ClassCastException: class java.util.LinkedHashMap cannot be cast to class com.example.dtos.UserElement (java.util.LinkedHashMap is in module java.base of loader 'bootstrap'; com.example.dtos.UserElement is in unnamed module of loader 'app')

我是否应该使用jooq会满意的特殊映射器

欢迎任何帮助

编辑：

Jooq版本：3.14.3 博士后：11

ctx.select USERS.ID.`as`ID， USERS.USERNAME.`as`name， 字段选择JSONARRAYAGG jsonObject jsonEntryid，USER_ELEMENT.ID， jsonEntryname，USER_ELEMENT.ELEMENTS .fromUSER\u ELEMENT.whereUSER\u ELEMENT.ID ”他说` 选择用户\u元素\u操作。用户\u元素\u ID .fromUSER\u元素\u操作 .whereUSER\u ELEMENT\u ACTION.USER\u ID.equals.ID “作为”要素 .来自用户 .apply{if条件！=null wherecondition} .fetchIntoUserRoles:：class.java dto

数据类UserRolesval id:Int，val name:String，val元素：List？ 数据类UserElementval id:Int，val名称：String 我也尝试过使用

ctx.configuration.setJooqMapperFactory.newInstance.newRecordMapperProvider 但是得到

MapperBuildingException: Could not find Getter for JooqFieldKey{field="elements", index=2} returning type

我正在使用spring boot，以下是我的jackson依赖项：

implementationcom.fasterxml.jackson.module:jackson模块kotlin:2.10.5 implementationcom.fasterxml.jackson.core:jackson数据绑定：2.10.0 堆栈跟踪：

java.lang.ClassCastException: class java.util.LinkedHashMap cannot be cast to class com.example.dtos.UserElement (java.util.LinkedHashMap is in module java.base of loader 'bootstrap'; com.example.common.dtos.UserElement is in unnamed module of loader 'app')
at com.example.dao.UserDao.findUserAuthorities(UserDao.kt:103) ~[main/:na]
at com.example.service.auth.AuthService.getUserDetailByUsername(AuthService.kt:34) ~[main/:na]
at com.example.security.AuthUserDetailService.loadUserByUsername(WebSecurityConfigurer.kt:58) ~[main/:na]
at com.example.security.jwt.JwtRequestFilter.passAuthToTheSecurityContext(JwtRequestFilter.kt:48) ~[main/:na]
at com.example.security.jwt.JwtRequestFilter.doFilterInternal(JwtRequestFilter.kt:35) ~[main/:na]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:92) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:77) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358) ~[spring-web-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271) ~[spring-web-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:93) ~[spring-boot-actuator-2.3.5.RELEASE.jar:2.3.5.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]

---

Jooq3.14增加了对通过gson或Jackson直接映射JSON到任意类的支持。这里记录了这一点：

注意，这是一个每列数据类型转换特性，由jOOQ的DefaultConverterProvider调用，而不是RecordMapper特性。经过更多的讨论，这似乎是RecordMapper中的一个bug，它没有为Jackson提供尽可能多的泛型类型信息：

---

该错误已在jOOQ 3.15.0和3.14.10中修复

您使用的是哪个jOOQ版本、哪个数据库和哪个JSON库？一般来说，请向我们展示您当前的代码，以确保我们谈论的内容完全相同。谢谢您的编辑。这真的会产生所提到的异常吗？我看不出1在这个例子中会有LinkedHashMap，2没有类型角色。你得到的确切的例外情况是什么？@LukasEder Thks获得快速反馈。事实上，只要我想循环元素，我就会得到异常。调试器显示元素列表未映射到UserElement列表，而是映射到LinkedHashMap。使用SimpleMapper时，元素字段为空。我明白了，很有趣。如果您的类路径上有gson或Jackson，那么您选择的方法是有效的。你…吗？SimpleMapper SimpleFlatMapper是如何实现的？这里牵涉到什么？谁在制作这张LinkedHashMap？我不认为jOOQ会那么做。。。你能在这里发布完整的堆栈跟踪吗？我已经更新了错误消息。我想我能够修复它，多亏了你的转换器提供程序链接。非常感谢。@aiqency:为了确保这一点，除了添加Jackson和可能将SimpleFlatMapper删除到类路径之外，您不需要做任何事情。如果它仍然没有，也许有一个错误？请随意在这里报告一个：，最好是使用MCVE，它可以帮助您在这里复制精确的设置模板：您是否在自己的方面尝试过？我收到另一个错误：由以下原因引起：com.fasterxml.jackson.databind.exc.InvalidDefinitionException:无法构造com.example.app.dao.UserRoles的实例与默认构造一样，没有创建者存在：无法从对象值反序列化没有委托或基于属性的创建者位于[Source:String{id:1，name:admin，elements:[{id:1，name:element1}，{id:5，name:element5}，…]，我想这不是jooq的问题。