I am new to spring boot and facing this issue for a while now.

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>2.7.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>Assignment</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>TestProject-3</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>11</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-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>

File Structure:

com.example.config.AppConfig.java -->

package com.example.config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@ComponentScan
public class AppConfig {

}

com.example.main -->

package com.example.main;

import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import com.example.config.AppConfig;
import com.example.service.EmployeeService;

public class TestProject3Application {

    public static void main(String[] args) {

        
        ApplicationContext ctx=new AnnotationConfigApplicationContext(AppConfig.class);
        EmployeeService emp=context.getBean(EmployeeService.class);
        emp.display();
    }
}

com.example.service.AddressService -->

package com.example.service;

import org.springframework.stereotype.Service;

@Service
public class AddressService {
public String getDetails() {
    return "Electronic City";
}
}

com.example.service.EmployeeService -->

package com.example.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class EmployeeService {
    
    @Autowired
    private AddressService add;
    
    public void display() {
        System.out.println(add.getDetails());
    }
}

And the error I am receiving is "context cannot be resolved", find the below image:

CodePudding user response：

Your spring boot version may cause your jar package to be missing, you can enter this command to fix it.

mvn dependency:purge-local-repository

If the error persists, delete your (~/.m2/repository/org/springframework) folder and execute the command。

Then run the mvn package command.

CodePudding user response：

You are using Spring Boot but try very hard to work around it. To solve.

1. Ditch your AppConfig class
2. Annotate TestProject3Application with @SpringBootApplication
3. Move TestProject3Application to com.example so it will properly detect everything
4. Fix your main doing ApplicationContext ctx= SpringApplication.run(TestProject3Application.class, args);

package com.example.main;

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

import com.example.service.EmployeeService;

@SpringBootApplication
public class TestProject3Application {

    public static void main(String[] args) {
        
        ApplicationContext ctx=SpringApplication.run(TestProject3Application.class, args);
        EmployeeService emp=context.getBean(EmployeeService.class);
        emp.display();
    }
}

Rebuild and run your application. If you decide to use a framework then use it and don't work around it. Also follow the best practices for that framework or when deviating from them at least understand them!.

CodePudding user response：

It ran successfully now. I have not provided the package name of beans in @ComponentScan. That's it!