Custom configuration properties in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a configuration property class with the correct annotation.

Spring Boot

@[1]("app.settings")
public class AppSettings {
    private String name;

    public String getName() {
        return name;
    }

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

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AComponent

BConfigurationProperties

CService

DRepository

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Component instead of @ConfigurationProperties

Forgetting to specify the prefix in the annotation

The @ConfigurationProperties annotation binds external properties to this class.

2fill in blank

medium

Complete the code to enable configuration properties scanning in the main application class.

Spring Boot

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

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AEnableAutoConfiguration

BComponentScan

CEnableConfigurationProperties

DConfigurationPropertiesScan

Attempts:

3 left

💡 Hint

Common Mistakes

Using @ComponentScan instead of @EnableConfigurationProperties

Not specifying the class in the annotation

The @EnableConfigurationProperties annotation tells Spring Boot to process the specified configuration properties class.

3fill in blank

hard

Fix the error in the configuration properties class by completing the missing annotation.

Spring Boot

public class DatabaseConfig {
    private String url;

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }
}

@[1]("database")
class DatabaseProperties extends DatabaseConfig {}

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AConfigurationProperties

BComponent

CService

DRepository

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to add @ConfigurationProperties

Using incorrect annotation like @Component

The subclass must be annotated with @ConfigurationProperties to bind properties with the prefix 'database'.

4fill in blank

hard

Fill both blanks to create a configuration properties class with a nested property and its getter.

Spring Boot

import org.springframework.boot.context.properties.ConfigurationProperties;

@[1]("server")
public class ServerProperties {
    private Security security = new Security();

    public Security getSecurity() {
        return [2];
    }

    public static class Security {
        private boolean enabled;

        public boolean isEnabled() {
            return enabled;
        }

        public void setEnabled(boolean enabled) {
            this.enabled = enabled;
        }
    }
}

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AConfigurationProperties

BComponent

Csecurity

DsecurityProperties

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Component instead of @ConfigurationProperties

Returning wrong field name in getter

The class must be annotated with @ConfigurationProperties and the getter should return the field named security.

5fill in blank

hard

Fill all three blanks to create a configuration properties class with a list property and its setter.

Spring Boot

import org.springframework.boot.context.properties.ConfigurationProperties;
import java.util.List;

@[1]("app")
public class AppConfig {
    private List<String> [2];

    public void set[3](List<String> values) {
        this.modules = values;
    }
}

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AConfigurationProperties

Bmodules

CModules

Dcomponents

Attempts:

3 left

💡 Hint

Common Mistakes

Naming the setter method incorrectly

Using wrong field name for the list

The class uses @ConfigurationProperties with prefix 'app'. The list field is named modules and the setter method is setModules.