This application has no explicit mapping for /error, so you are seeing this as a fallback.

Question

Eclipse运行Spring cloud alibaba:浏览器报错：This application has no explicit mapping for /error, so you are seeing this as a fallback.

自己实在找不到问题出在哪里

Spring cloud alibaba项目目录框架：

Spring cloud alibaba父类pom.xml

<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>
  <groupId>com.hellospringcloud</groupId>
  <artifactId>hellospringcloud</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>pom</packaging>
  <name>hellospringcloud</name>
  <description>hellospringcloud</description>
  
  
  <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.4</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
  <properties>
      <java.version>1.8</java.version>
      <thymeleaf.version>3.0.2.RELEASE</thymeleaf.version>
    <thymeleaf-layout-dialect.version>2.0.5</thymeleaf-layout-dialect.version>
  </properties>
  <dependencies>
      <!-- Spring boot 基本场景启动器 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
    </dependency>
    <!-- Spring boot 测试场景启动器 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
        <exclusions>
            <exclusion>
                <groupId>org.junit.vintage</groupId>
                <artifactId>junit-vintage-engine</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
  </dependencies>
  
      <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
      <modules>
          <module>hello</module>
      </modules>
      
      <dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-alibaba-dependencies</artifactId>
            <version>2.2.1.RELEASE</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>
</project>

子项目hello的pom文件

<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>com.hellospringcloud</groupId>
    <artifactId>hellospringcloud</artifactId>
    <version>0.0.1-SNAPSHOT</version>
  </parent>
  <artifactId>hello</artifactId>
  <name>hello</name>
  <description>hello</description>
  
  
  <dependencies>
      <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
  </dependencies>
</project>

HelloApplication.java

package hello;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class HelloApplication {
    public static void main(String[] args) {
        SpringApplication.run(HelloApplication.class, args);
    }

}

HelloController.java

package hello.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("/hello")
public class HelloController {
    @RequestMapping("/hello1")
    public String name() {
        String msgString = "Hello World!";
        System.out.println(msgString);
        return msgString;
        
    }

}

---

运行结果

访问：http://localhost:8080/hello/hello1
浏览器显示结果

Answer 1

将@Controller改为@RestController就可以了