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Example of Complete Code

/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 http://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>3.0.0-M4</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <groupId>com.in28minutes.springboot.tutorial.basics.example</groupId>
    <artifactId>spring-boot-tutorial-basics</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>spring-boot-tutorial-basics</name>
    <description>Spring Boot Tutorial - Basic Concept Examples</description>

    <properties>
        <java.version>17</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</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-aop</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </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>

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>

    <pluginRepositories>
        <pluginRepository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>


</project>

/src/main/java/com/in28minutes/springboot/tutorial/basics/example/aop/AfterAopAspect.java

package com.in28minutes.springboot.tutorial.basics.example.aop;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Configuration;

//AOP
//Configuration
@Aspect
@Configuration
public class AfterAopAspect {

    private final Logger LOGGER = LoggerFactory.getLogger(this.getClass());

    @AfterReturning(value = "execution(* com.in28minutes.springboot.tutorial.basics.example.aop.business.*.*(..))",
            returning = "result")
    public void afterReturning(JoinPoint joinPoint, Object result) {
        LOGGER.info("{} returned with value {}", joinPoint, result);
    }

    @After(value = "execution(* com.in28minutes.springboot.tutorial.basics.example.aop.business.*.*(..))")
    public void after(JoinPoint joinPoint) {
        LOGGER.info("after execution of {}", joinPoint);
    }
}

/src/main/java/com/in28minutes/springboot/tutorial/basics/example/aop/business/Business1.java

package com.in28minutes.springboot.tutorial.basics.example.aop.business;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.in28minutes.springboot.tutorial.basics.example.aop.data.Dao1;

@Service
public class Business1 {

    private final Logger LOGGER = LoggerFactory.getLogger(this.getClass());

    @Autowired
    private Dao1 dao1;

    public String calculateSomething() {
        //Business Logic
        String value = dao1.retrieveSomething();
        LOGGER.info("In Business - {}", value);
        return value;
    }
}

/src/main/java/com/in28minutes/springboot/tutorial/basics/example/aop/business/Business2.java

package com.in28minutes.springboot.tutorial.basics.example.aop.business;

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

import com.in28minutes.springboot.tutorial.basics.example.aop.data.Dao2;

@Service
public class Business2 {

    @Autowired
    private Dao2 dao2;

    public String calculateSomething() {
        //Business Logic
        return dao2.retrieveSomething();
    }
}

/src/main/java/com/in28minutes/springboot/tutorial/basics/example/aop/CommonJoinPointConfig.java

package com.in28minutes.springboot.tutorial.basics.example.aop;

import org.aspectj.lang.annotation.Pointcut;

public class CommonJoinPointConfig {

    @Pointcut("execution(* com.in28minutes.springboot.basics.example.aop.data.*.*(..))")
    public void dataLayerExecution() {
    }

    @Pointcut("execution(* com.in28minutes.springboot.basics.example.aop.business.*.*(..))")
    public void businessLayerExecution() {
    }

    @Pointcut("dataLayerExecution() && businessLayerExecution()")
    public void allLayerExecution() {
    }

    @Pointcut("bean(*dao*)")
    public void beanContainingDao() {
    }

    @Pointcut("within(com.in28minutes.springboot.basics.example.aop.data..*)")
    public void dataLayerExecutionWithWithin() {
    }

    @Pointcut("@annotation(com.in28minutes.springboot.basics.example.aop.TrackTime)")
    public void trackTimeAnnotation() {
    }

}

/src/main/java/com/in28minutes/springboot/tutorial/basics/example/aop/data/Dao1.java

package com.in28minutes.springboot.tutorial.basics.example.aop.data;

import org.springframework.stereotype.Repository;

@Repository
public class Dao1 {

    public String retrieveSomething() {
        return "Dao1";
    }

}

/src/main/java/com/in28minutes/springboot/tutorial/basics/example/aop/data/Dao2.java

package com.in28minutes.springboot.tutorial.basics.example.aop.data;

import org.springframework.stereotype.Repository;

@Repository
public class Dao2 {

    public String retrieveSomething() {
        return "Dao2";
    }

}

/src/main/java/com/in28minutes/springboot/tutorial/basics/example/aop/UserAccessAspect.java

package com.in28minutes.springboot.tutorial.basics.example.aop;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Configuration;

//AOP
//Configuration
@Aspect
@Configuration
public class UserAccessAspect {

    private final Logger LOGGER = LoggerFactory.getLogger(this.getClass());

    //What kind of method calls I would intercept
    //execution(* PACKAGE.*.*(..))
    //Weaving & Weaver
    @Before("execution(* com.in28minutes.springboot.tutorial.basics.example.aop.data.*.*(..))")
    public void before(JoinPoint joinPoint) {
        //Advice
        LOGGER.info(" Check for user access ");
        LOGGER.info(" Allowed execution for {}", joinPoint);
    }
}

/src/main/java/com/in28minutes/springboot/tutorial/basics/example/application/context/java/JavaConfiguration.java

package com.in28minutes.springboot.tutorial.basics.example.application.context.java;

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

@Configuration
public class JavaConfiguration {

    @Bean
    public String someDummyBean1() {
        return "someDummyBean1";
    }

    @Bean
    public String someDummyBean2() {
        return "someDummyBean2";
    }

}

/src/main/java/com/in28minutes/springboot/tutorial/basics/example/application/context/java/XmlConfiguration.java

package com.in28minutes.springboot.tutorial.basics.example.application.context.java;

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

@Configuration
@ImportResource({"classpath*:applicationContext.xml"})
public class XmlConfiguration {
}

/src/main/java/com/in28minutes/springboot/tutorial/basics/example/SpringBootTutorialBasicsApplication.java

package com.in28minutes.springboot.tutorial.basics.example;

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

@SpringBootApplication
public class SpringBootTutorialBasicsApplication {

    public static void main(String[] args) {
        ApplicationContext applicationContext = SpringApplication.run(SpringBootTutorialBasicsApplication.class, args);

        for (String name : applicationContext.getBeanDefinitionNames()) {
            System.out.println(name);
        }
    }
}

/src/main/java/com/in28minutes/springboot/tutorial/basics/example/student/Student.java

package com.in28minutes.springboot.tutorial.basics.example.student;

import jakarta.persistence.Entity;
import jakarta.persistence.GeneratedValue;
import jakarta.persistence.Id;

@Entity
public class Student {
    @Id
    @GeneratedValue
    private Long id;

    private String name;

    private String passportNumber;

    public Student() {
        super();
    }

    public Student(Long id, String name, String passportNumber) {
        super();
        this.id = id;
        this.name = name;
        this.passportNumber = passportNumber;
    }

    public Student(String name, String passportNumber) {
        super();
        this.name = name;
        this.passportNumber = passportNumber;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPassportNumber() {
        return passportNumber;
    }

    public void setPassportNumber(String passportNumber) {
        this.passportNumber = passportNumber;
    }

    @Override
    public String toString() {
        return String.format("Student [id=%s, name=%s, passportNumber=%s]", id, name, passportNumber);
    }

}

/src/main/java/com/in28minutes/springboot/tutorial/basics/example/student/StudentRepository.java

package com.in28minutes.springboot.tutorial.basics.example.student;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface StudentRepository extends JpaRepository<Student, Long> {

}

/src/main/java/com/in28minutes/springboot/tutorial/basics/example/student/StudentResource.java

package com.in28minutes.springboot.tutorial.basics.example.student;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class StudentResource {

    @Autowired
    private StudentRepository studentRepository;

    @GetMapping("/students")
    public List<Student> retrieveAllStudents() {
        return studentRepository.findAll();
    }
}

/src/main/java/com/in28minutes/springboot/tutorial/basics/example/unittesting/BusinessService.java

package com.in28minutes.springboot.tutorial.basics.example.unittesting;

import org.springframework.stereotype.Service;

@Service
public class BusinessService {

    private final DataService dataService;

    public BusinessService(DataService dataService) {
        super();
        this.dataService = dataService;
    }

    public int findTheGreatestFromAllData() {
        int[] data = dataService.retrieveAllData();
        int greatest = Integer.MIN_VALUE;

        for (int value : data) {
            if (value > greatest) {
                greatest = value;
            }
        }
        return greatest;
    }
}

/src/main/java/com/in28minutes/springboot/tutorial/basics/example/unittesting/DataService.java

package com.in28minutes.springboot.tutorial.basics.example.unittesting;

import org.springframework.stereotype.Repository;

@Repository
public class DataService {
    public int[] retrieveAllData() {
        // Some dummy data
        // Actually this should talk to some database to get all the data
        return new int[]{1, 2, 3, 4, 5};
    }
}

/src/main/resources/application.properties

logging.level.org.springframework.web=DEBUG
logging.level.org.hibernate=INFO

/src/main/resources/applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- <context:component-scan base-package="com.in28minutes.spring.basics"/> -->

    <bean id="xmlStringBean1" class="java.lang.String">
        <constructor-arg value="stringBean1"/>
    </bean>

    <bean id="xmlStringBean2" class="java.lang.String">
        <constructor-arg value="stringBean2"/>
    </bean>

</beans>

/src/test/java/com/in28minutes/springboot/tutorial/basics/example/aop/BusinessAopSpringBootTest.java

package com.in28minutes.springboot.tutorial.basics.example.aop;

import com.in28minutes.springboot.tutorial.basics.example.aop.business.Business1;
import com.in28minutes.springboot.tutorial.basics.example.aop.business.Business2;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit.jupiter.SpringExtension;

@ExtendWith(SpringExtension.class)
@SpringBootTest
public class BusinessAopSpringBootTest {

    private final Logger LOGGER = LoggerFactory.getLogger(this.getClass());

    @Autowired
    private Business1 business1;

    @Autowired
    private Business2 business2;

    @Test
    public void invokeAOPStuff() {
        LOGGER.info(business1.calculateSomething());

        LOGGER.info(business2.calculateSomething());
    }
}

/src/test/java/com/in28minutes/springboot/tutorial/basics/example/SpringBootTutorialBasicsApplicationTests.java

package com.in28minutes.springboot.tutorial.basics.example;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit.jupiter.SpringExtension;

@ExtendWith(SpringExtension.class)
@SpringBootTest
public class SpringBootTutorialBasicsApplicationTests {

    @Test
    public void contextLoads() {
    }

}

/src/test/java/com/in28minutes/springboot/tutorial/basics/example/unittest/BusinessServicesMockSpringContextTest.java

package com.in28minutes.springboot.tutorial.basics.example.unittest;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.mockito.Mockito.when;

import com.in28minutes.springboot.tutorial.basics.example.unittesting.BusinessService;
import com.in28minutes.springboot.tutorial.basics.example.unittesting.DataService;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.test.mock.mockito.MockBean;
import org.springframework.test.context.junit.jupiter.SpringExtension;

@ExtendWith(SpringExtension.class)
@SpringBootTest
public class BusinessServicesMockSpringContextTest {

    @MockBean
    DataService dataServiceMock;

    @Autowired
    BusinessService businessImpl;

    @Test
    public void testFindTheGreatestFromAllData() {
        when(dataServiceMock.retrieveAllData()).thenReturn(new int[]{24, 15, 3});
        assertEquals(24, businessImpl.findTheGreatestFromAllData());
    }

    @Test
    public void testFindTheGreatestFromAllData_ForOneValue() {
        when(dataServiceMock.retrieveAllData()).thenReturn(new int[]{15});
        assertEquals(15, businessImpl.findTheGreatestFromAllData());
    }

    @Test
    public void testFindTheGreatestFromAllData_NoValues() {
        when(dataServiceMock.retrieveAllData()).thenReturn(new int[]{});
        assertEquals(Integer.MIN_VALUE, businessImpl.findTheGreatestFromAllData());
    }
}

/src/test/java/com/in28minutes/springboot/tutorial/basics/example/unittest/BusinessServicesMockTest.java

package com.in28minutes.springboot.tutorial.basics.example.unittest;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.mockito.Mockito.when;

import com.in28minutes.springboot.tutorial.basics.example.unittesting.BusinessService;
import com.in28minutes.springboot.tutorial.basics.example.unittesting.DataService;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.springframework.test.context.junit.jupiter.SpringExtension;

@ExtendWith(SpringExtension.class)
public class BusinessServicesMockTest {

    @Mock
    DataService dataServiceMock;

    @InjectMocks
    BusinessService businessImpl;

    @Test
    public void testFindTheGreatestFromAllData() {
        when(dataServiceMock.retrieveAllData()).thenReturn(new int[]{24, 15, 3});
        assertEquals(24, businessImpl.findTheGreatestFromAllData());
    }

    @Test
    public void testFindTheGreatestFromAllData_ForOneValue() {
        when(dataServiceMock.retrieveAllData()).thenReturn(new int[]{15});
        assertEquals(15, businessImpl.findTheGreatestFromAllData());
    }

    @Test
    public void testFindTheGreatestFromAllData_NoValues() {
        when(dataServiceMock.retrieveAllData()).thenReturn(new int[]{});
        assertEquals(Integer.MIN_VALUE, businessImpl.findTheGreatestFromAllData());
    }
}