Spring Boot注解@GetMapping无法解析为一个类型 [英] Spring Boot annotation @GetMapping can not be resolved to a type

问题描述

我第一次尝试在本地计算机上从 Spring Initializr 创建一个 Spring 项目.但我收到这些错误 @GetMapping 无法解析为类型.

I tried creating a Spring Project from Spring Initializr for the first time in my local computer. But I am getting these errors @GetMapping cannot be resolved to a type.

我的 pom.xml 文件-

My pom.xml file-

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.4.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>



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

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jersey</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>

    </dependency>

    <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</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>

有人可以帮我解决这个问题吗?我缺少某些依赖项吗?

Can someone help me with this? Is there some dependency I am missing?

推荐答案

您拥有 Spring Boot 运行所需的所有依赖项，我使用了您的相同 pom 并且它有效，几点:

You have all dependenices which required for spring boot to run and I used your same pom and its worked, few points:

1. 如果你有

1. If you have

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

则不需要:

 <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>

    </dependency>

    <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>

</dependency>

您可以删除这些依赖项，因为 starter 包含它.

you can delete these dependencies as starter includes it.

1. 同时添加 maven 插件

1. Also add maven plugin

<build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

然后从命令行运行:运行 mvn clean install3.然后尝试重建项目4. 如果还是不行，那么把你的 starter-web 作为第一个依赖项，然后再次检查.

and after this from command line: run mvn clean install 3. then try to rebuild project 4. if still do not work then move your starter-web as first dependency and again check.

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