java - Spring Boot Kotlin API 为所有端点返回 404 响应

Question

我正在将 Spring Boot 与 Kotlin 一起使用。其余 Controller 为所有端点返回 404 错误。在启动日志中， Controller 中的端点不存在。任何端点都返回相同的 404 响应。

这些是我尝试过的步骤，

尝试清除缓存/目标

将所有类移动到单个目录中

尝试添加 ComponentScan 注释，但未被接受。

我正在使用 cmd 行运行项目

运行 java -jar $jarfile

时看到的相同输出

检查注解 Repository , Service , RestController

Controller :

package com.example.controller

import org.springframework.web.bind.annotation.RestController
import org.springframework.web.bind.annotation.PathVariable
import org.springframework.http.ResponseEntity
import org.springframework.web.bind.annotation.GetMapping
import org.springframework.http.HttpStatus
import org.springframework.web.bind.annotation.PostMapping
import org.springframework.web.bind.annotation.PutMapping
import org.springframework.web.bind.annotation.DeleteMapping
import org.springframework.web.bind.annotation.RequestBody

import Cricketer
import CricketerRepository
import CricketerService
import org.springframework.web.bind.annotation.RequestMapping

@RestController
@RequestMapping("/api")
class CricketerController(private val cricketerService: CricketerService , private val cricketerRepository: CricketerRepository){

    @GetMapping("/cricketers/{id}")
    fun getCricketer(@PathVariable("id") id: Long):ResponseEntity<Cricketer>  {
        val cricketer = cricketerService.findById(id)
        return ResponseEntity<Cricketer>(cricketer as Cricketer, HttpStatus.OK);
    }

    @GetMapping("/cricketers/")
    fun getAllCricketers() :ResponseEntity<List<Cricketer>>  {
        var cricketersList: ArrayList<Cricketer> =  cricketerService.getAllPlayers() as (ArrayList<Cricketer>)
        return ResponseEntity<List<Cricketer>>(cricketersList, HttpStatus.OK)
    }

    @PostMapping("/cricketer/")
    fun addCricketer(@RequestBody cricketer:Cricketer):ResponseEntity<Cricketer>  {
        val cCricketer : Cricketer = Cricketer(name = cricketer.name
                , country = cricketer.country
                , highestScore = cricketer.highestScore)
        cricketerRepository.save(cCricketer)
        return ResponseEntity<Cricketer>(cricketer , HttpStatus.OK)
    }

    @PutMapping("/cricketer/{id}")
    fun updateCricketer(@PathVariable("id") id: Long, @RequestBody cricketer: Cricketer ):ResponseEntity<Cricketer> {
        val cCricketer  = Cricketer(name = cricketer.name
                , country = cricketer.country
                , highestScore = cricketer.highestScore)
        cricketerRepository.save(cCricketer)
        return ResponseEntity<Cricketer>(cricketer, HttpStatus.OK)
    }

    @DeleteMapping("/cricketer/{id}")
    fun deleteCricketer(@PathVariable("id") id:Long ):ResponseEntity<String> {
        val cCricketer :Cricketer  = cricketerService.findById(id) as Cricketer
        cricketerRepository.delete(cCricketer)
        return ResponseEntity<String>("cricketer removed", HttpStatus.OK)
    }
}

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>Spring-Kotlin-Rest-API</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>Spring-Kotlin-Rest-API</name>
    <description>Spring Boot Kotlin REST API Example</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <kotlin.version>1.2.41</kotlin.version>

    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.module</groupId>
            <artifactId>jackson-module-kotlin</artifactId>
        </dependency>
        <dependency>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-stdlib-jdk8</artifactId>
        </dependency>
        <dependency>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-reflect</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <sourceDirectory>${project.basedir}/src/main/kotlin</sourceDirectory>
        <testSourceDirectory>${project.basedir}/src/test/kotlin</testSourceDirectory>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>       
            </plugin>
            <plugin>
                <artifactId>kotlin-maven-plugin</artifactId>
                <groupId>org.jetbrains.kotlin</groupId>
                <configuration>
                    <args>
                        <arg>-Xjsr305=strict</arg>
                    </args>

                    <compilerPlugins>

                        <plugin>spring</plugin>
                    </compilerPlugins>
                    <jvmTarget>1.8</jvmTarget>          
                </configuration>
                <dependencies>
                    <dependency>
                        <groupId>org.jetbrains.kotlin</groupId>
                        <artifactId>kotlin-maven-allopen</artifactId>
                        <version>${kotlin.version}</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>
</project>

启动日志

2018-05-21 22:31:19.490  INFO 3061 --- [           main] c.e.d.SpringKotlinRestApiApplicationKt   : Starting SpringKotlinRestApiApplicationKt on nirmal-desktop with PID 3061 (/home/nirmal/code/workspace-sts-3.9.1.RELEASE/Spring-Kotlin-Rest-API/target/classes started by root in /home/nirmal/code/workspace-sts-3.9.1.RELEASE/Spring-Kotlin-Rest-API)
2018-05-21 22:31:19.512  INFO 3061 --- [           main] c.e.d.SpringKotlinRestApiApplicationKt   : No active profile set, falling back to default profiles: default
2018-05-21 22:31:19.592  INFO 3061 --- [           main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@5bab7c16: startup date [Mon May 21 22:31:19 IST 2018]; root of context hierarchy
2018-05-21 22:31:29.492  INFO 3061 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$28d3b505] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2018-05-21 22:31:33.847  INFO 3061 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2018-05-21 22:31:34.312  INFO 3061 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2018-05-21 22:31:34.313  INFO 3061 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.31
2018-05-21 22:31:34.389  INFO 3061 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener   : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib]
2018-05-21 22:31:36.190  INFO 3061 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2018-05-21 22:31:36.190  INFO 3061 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 16602 ms
2018-05-21 22:31:36.560  INFO 3061 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Servlet dispatcherServlet mapped to [/]
2018-05-21 22:31:36.564  INFO 3061 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-05-21 22:31:36.566  INFO 3061 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-05-21 22:31:36.566  INFO 3061 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-05-21 22:31:36.566  INFO 3061 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]
2018-05-21 22:31:37.743  INFO 3061 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Starting...
2018-05-21 22:31:39.038  INFO 3061 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Start completed.
2018-05-21 22:31:39.222  INFO 3061 --- [           main] j.LocalContainerEntityManagerFactoryBean : Building JPA container EntityManagerFactory for persistence unit 'default'
2018-05-21 22:31:39.480  INFO 3061 --- [           main] o.hibernate.jpa.internal.util.LogHelper  : HHH000204: Processing PersistenceUnitInfo [
    name: default
    ...]
2018-05-21 22:31:40.064  INFO 3061 --- [           main] org.hibernate.Version                    : HHH000412: Hibernate Core {5.2.17.Final}
2018-05-21 22:31:40.066  INFO 3061 --- [           main] org.hibernate.cfg.Environment            : HHH000206: hibernate.properties not found
2018-05-21 22:31:40.302  INFO 3061 --- [           main] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
2018-05-21 22:31:42.180  INFO 3061 --- [           main] org.hibernate.dialect.Dialect            : HHH000400: Using dialect: org.hibernate.dialect.MySQL5InnoDBDialect
2018-05-21 22:31:44.235  INFO 3061 --- [           main] o.h.t.schema.internal.SchemaCreatorImpl  : HHH000476: Executing import script 'org.hibernate.tool.schema.internal.exec.ScriptSourceInputNonExistentImpl@7d95eb4a'
2018-05-21 22:31:44.237  INFO 3061 --- [           main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2018-05-21 22:31:44.688  INFO 3061 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-05-21 22:31:46.829  INFO 3061 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@5bab7c16: startup date [Mon May 21 22:31:19 IST 2018]; root of context hierarchy
2018-05-21 22:31:46.894  WARN 3061 --- [           main] aWebConfiguration$JpaWebMvcConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2018-05-21 22:31:47.072  INFO 3061 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2018-05-21 22:31:47.073  INFO 3061 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2018-05-21 22:31:47.121  INFO 3061 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-05-21 22:31:47.122  INFO 3061 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-05-21 22:31:49.030  INFO 3061 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2018-05-21 22:31:49.033  INFO 3061 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Bean with name 'dataSource' has been autodetected for JMX exposure
2018-05-21 22:31:49.047  INFO 3061 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Located MBean 'dataSource': registering with JMX server as MBean [com.zaxxer.hikari:name=dataSource,type=HikariDataSource]
2018-05-21 22:31:50.682  INFO 3061 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2018-05-21 22:31:50.695  INFO 3061 --- [           main] c.e.d.SpringKotlinRestApiApplicationKt   : Started SpringKotlinRestApiApplicationKt in 34.697 seconds (JVM running for 49.043)

Answer 1

我猜你的 CricketerController不在相对于您的主类的子包中。所以你基本上有两个选择:

将您的主类直接放在包 下com.example

将此答案底部的注释添加到您的主类中。

使用这两种方法中的任何一种都会使 Controller 类在启动时对 Spring 可见，因此应该创建您的映射。

@ComponentScan(basePackages = { "com.example.controller"} )