Spring Boot annotation @GetMapping can not be resolved to a type

问题

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.

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>

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

回答1:

I recommend you to start with https://start.spring.io/ for Spring Initalizr project. You're missing this dependency

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

回答2:

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

If you have

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

then not required:

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

    </dependency>

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

</dependency>

you can delete these dependencies as starter includes it.

Also add maven plugin

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

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.

来源：https://stackoverflow.com/questions/52190102/spring-boot-annotation-getmapping-can-not-be-resolved-to-a-type

标签

Spring

spring-mvc

spring-boot

spring-web