Java spring boot restcontroller not working

Question

I wrote simple java spring boot application code In the application, I have 3 class file

1. DemoApplication -- contains main method

2. Student class- POCO class contains following code

   package student;

   import java.time.LocalDate;

   public class Student {

    private Long id; private String name; private String email; private LocalDate dob; private int age; 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 getEmail() { return email; } public void setEmail(String email) { this.email = email; } public LocalDate getDob() { return dob; } public void setDob(LocalDate dob) { this.dob = dob; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public Student(Long id, String name, String email, LocalDate dob, int age) { super(); this.id = id; this.name = name; this.email = email; this.dob = dob; this.age = age; } @Override public String toString() { return "Student [id=" + id + ", name=" + name + ", email=" + email + ", dob=" + dob + ", age=" + age + "]"; }

   }

3. StudentController class-- controller contains following code

   package student;

   import java.time.LocalDate; import java.util.List;

   import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController;

   @RestController @RequestMapping(path="/api/student") public class StudentController {

    @GetMapping(path="/all") public List<Student> getStudents() { return List.of( new Student( 1L, "Yuvraj Meshram", "yuvraj.meshram@gmail.com", LocalDate.of(2001, 5, 6), 21 ) ); }

   }

If I run the application,it started without any error on localhost:8080, but when I hit the url "localhost:8080/api/student/all" , it show me error page "WhiteLabel Error Page".

My pom.xml contains following code

<?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>2.7.1</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</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.postgresql</groupId>
            <artifactId>postgresql</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>

</project>

Please help me with this guys.

Answer 1

Try adding a @ComponentScan on top of your DemoApplication class. It is probably a package issue.