Spring 3.2找不到@RestController

php小编小新在使用Spring 3.2时，发现了一个常见的问题——找不到@RestController注解。在使用@RestController注解时，可能会遇到编译错误或运行时错误，导致无法正常使用该注解。这个问题可能涉及到版本兼容性或配置问题，需要进行相应的解决和调整。在本文中，我们将探讨这个问题的原因和解决方法，帮助读者解决Spring 3.2中找不到@RestController注解的困扰。

问题内容

这是有线的，我尝试设置@restcontroller，但它找不到它 从 intellij 社区 ide 运行 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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelversion>4.0.0</modelversion>
    <parent>
        <groupid>org.springframework.boot</groupid>
        <artifactid>spring-boot-starter-parent</artifactid>
        <version>3.2.2</version>
        <relativepath/> <!-- lookup parent from repository -->
    </parent>
    <groupid>com.restservice</groupid>
    <artifactid>restservice</artifactid>
    <version>0.0.1-snapshot</version>
    <name>restservice</name>
    <description>restservice</description>
    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <!--<dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter</artifactid>
        </dependency>-->
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-web</artifactid>
        </dependency>

        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-test</artifactid>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupid>org.springframework.boot</groupid>
                <artifactid>spring-boot-maven-plugin</artifactid>
            </plugin>
        </plugins>
    </build>

</project>

和简单的类：

package com.restservice.restservice;

import org.springframework.boot.springapplication;
import org.springframework.boot.autoconfigure.springbootapplication;

@springbootapplication
public class restserviceapplication {

    public static void main(string[] args) {
        springapplication.run(restserviceapplication.class, args);
    }

}

package com.restservice.restservice;


@restcontroller <--- can't find it painted with red
public class restcontroller {

}

还有编译错误：

[INFO] --- maven-compiler-plugin:3.11.0:compile (default-compile) @ restservice ---
[INFO] Changes detected - recompiling the module! :source
[INFO] Compiling 2 source files with javac [debug release 17] to target\classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /C:/dev/my/java/spring_applications/ReactiveSpringBootREST Service2/restservice/src/main/java/com/restservice/restservice/RestController.java:[4,2] incompatible types: com.restservice
.restservice.RestController cannot be converted to java.lang.annotation.Annotation
[INFO] 1 error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  1.771 s
[INFO] Finished at: 2024-02-01T17:45:04+02:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.11.0:compile (default-compile) on project restservice: Compilation failure
[ERROR] /C:/dev/my/java/spring_applications/ReactiveSpringBootREST Service2/restservice/src/main/java/com/restservice/restservice/RestController.java:[4,2] incompatible types: com.restservice
.restservice.RestController cannot be converted to java.lang.annotation.Annotation
[ERROR]
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException






$ java -version 
java version "17.0.4.1" 2022-08-18 LTS
Java(TM) SE Runtime Environment (build 17.0.4.1+1-LTS-2)                       
Java HotSpot(TM) 64-Bit Server VM (build 17.0.4.1+1-LTS-2, mixed mode, sharing)

解决方法

您注释掉主要 Spring Boot 启动器依赖项有什么特殊原因吗？尝试使用 Maven 重新加载您的项目，并在项目窗口中检查您的外部库文件夹以确保您具有依赖项。 RestController注解预计从org.springframework.web.bind.annotation.RestController导入。

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