spring - 带有JpaRepository的RestController返回javax.servlet.ServletException:处理程序无适配器

Question

使用Kotlin，我具有以下依赖关系:

implementation("org.springframework.boot:spring-boot-starter-web")
implementation(kotlin("stdlib-jdk8"))

implementation("org.springframework.boot:spring-boot-starter-data-jpa")
runtimeOnly("org.postgresql:postgresql")
implementation(kotlin("reflect"))

该实体:

@Entity
@Table(name = "some_table")
data class SomeEntity(
    @Id val someNumber: Int,
    val someText: String
)

使用这个存储库 interface SomeRepo : JpaRepository<SomeEntity, Int>和这个 Controller :

@RestController("/someEntity")
class SomeController(
    val someRepo: SomeRepo
) {
    @GetMapping
    fun findAll() = someRepo.findAll()
}

但是当我尝试 javax.servlet.ServletException: No adapter for handler [com.controller.SomeController@10ffe32f]: The DispatcherServlet configuration needs to include a HandlerAdapter that supports this handler时，总是会收到此异常 localhost:8080/someEntity将 findAll更改为 @GetMapping fun findAll(): List<SomeEntity> = listOf(SomeEntity(1, "a"))无法解决。我在这里想念的是什么？

Answer 1

传递给value的@RequestController不是URL映射，而是Spring bean的名称。必须在类级别使用@RequestMapping或在每种方法上使用@GetMapping / @PostMapping。显式提供根映射。

@RestController
@RequestMapping("/someEntity")
class SomeController(
    val someRepo: SomeRepo
) {
    @GetMapping
    fun findAll() = someRepo.findAll()
}

要么

@RestController
class SomeController(
    val someRepo: SomeRepo
) {
    @GetMapping("/someEntity")
    fun findAll() = someRepo.findAll()
}