我不能强迫Spring为Jackson使用Kotlin模块.
问题是Jackson无法将JSON解析为数据类.
//Exception
2018-02-23 13:29:09.046 ERROR 24730 --- [nio-9300-exec-1] o.a.c.c.C.[.[.[.[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [/services] threw exception [Request processing Failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [*.model.User]: Constructor threw exception; nested exception is java.lang.IllegalArgumentException: Parameter specified as non-null is null: method *.model.User.我试图配置杰克逊,但它没有多大帮助.有什么奇怪的,在我配置ObjectMapper的@Bean方法中,一切正常.
此外,当我为非可空字段添加默认值时,它们不会被覆盖.
@Configuration
class JacksonConfig {
@Bean
fun mappingJackson2HttpMessageConverter(): MappingJackson2HttpMessageConverter {
val mapper = ObjectMapper().registerKotlinModule()
mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS,false)
var user = mapper.readValue可能重要的是模型与应用程序本身在不同的项目中.
Kotlin版本是1.20
杰克逊依赖：
我现在尝试的是：
Similiar problem but probably different case anyway
还有一些其他的,不值得注意的.
最佳答案
我是愚蠢的,认真的.
我的结构如下：
abstract class AbstractController (...) {
fun save(@RequestMapping entity: T) {
(...)
}
并启用它我用过
class DeriveredController (...) {
@PostMapping
override fun save(entity: Derivered) {
(...)
}
}
问题在于导出函数中缺少@RequestMapping.
