php小編小新在使用Spring 3.2時，發現了一個常見的問題－找不到@RestController註解。使用@RestController註解時，可能會遇到編譯錯誤或執行時錯誤，導致無法正常使用該註解。這個問題可能涉及版本相容性或設定問題，需要進行相應的解決和調整。在本文中，我們將探討這個問題的原因和解決方法，幫助讀者解決Spring 3.2中找不到@RestController註解的困擾。
這是有線的，我嘗試設定@restcontroller，但它找不到它 從 intellij 社區 ide 運行 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>和簡單的類別：
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 {
}還有編譯錯誤：
[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)
您註解掉主要 Spring Boot 啟動器相依性有什麼特殊原因嗎？嘗試使用 Maven 重新載入您的項目，並在項目視窗中檢查您的外部庫資料夾以確保您具有依賴項。 RestController註解預計從org.springframework.web.bind.annotation.RestController導入。
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