Why configuration matters in Spring Boot - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to load a property value from application.properties.

Spring Boot

@Value("$[1]")
private String appName;

Drag options to blanks, or click blank then click option'

Aapp.name

Bserver.port

Cspring.datasource.url

Dlogging.level

Attempts:

3 left

💡 Hint

Common Mistakes

Using unrelated property keys like server.port or logging.level.

The @Value annotation loads the property named app.name from the configuration file.

2fill in blank

medium

Complete the code to define a configuration property with a default value.

Spring Boot

@Value("${custom.timeout:[1]")
private int timeout;

Drag options to blanks, or click blank then click option'

A30

Bnull

Ctrue

Ddefault

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-numeric default values like 'true' or 'default'.

The default value 30 is used if custom.timeout is not set in the configuration.

3fill in blank

hard

Fix the error in the configuration property injection.

Spring Boot

@Value("$[1]")
private String databaseUrl;

Drag options to blanks, or click blank then click option'

Aspring.datasource-url

Bspring.datasource.url

Cspring.datasource_url

Dspring.datasource url

Attempts:

3 left

💡 Hint

Common Mistakes

Using dashes or underscores instead of dots in property keys.

The correct property key uses dots to separate words, like spring.datasource.url.

4fill in blank

hard

Fill both blanks to create a configuration class with a property prefix.

Spring Boot

@ConfigurationProperties(prefix = "[1]")
public class [2]Config {
    private String url;

    public String getUrl() {
        return url;
    }

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

Drag options to blanks, or click blank then click option'

Aapp

Bdatabase

CApp

DDatabase

Attempts:

3 left

💡 Hint

Common Mistakes

Using uppercase prefix or lowercase class names.

The prefix database matches the property group, and the class name DatabaseConfig follows Java naming conventions.

5fill in blank

hard

Fill all three blanks to bind nested configuration properties.

Spring Boot

@ConfigurationProperties(prefix = "[1]")
public class [2]Config {
    private final [3] security = new [3]();

    public [3] getSecurity() {
        return security;
    }

    public static class Security {
        private boolean enabled;

        public boolean isEnabled() {
            return enabled;
        }

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

Drag options to blanks, or click blank then click option'

Aserver

BServer

CSecurity

DApplication

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatching prefix and class names or incorrect nested class names.

The prefix server groups related properties, the class ServerConfig matches the prefix, and the nested class Security holds security settings.