How to Set Default Properties in a Spring Boot Library

How can I set default properties in a Spring Boot library?

@ConfigurationProperties(prefix = "my.library")
public class LibraryProperties {
    private String propertyOne = "defaultOne";
    private String propertyTwo = "defaultTwo";

    // Getters and Setters
}

In Spring Boot, setting default properties for a library or application involves defining a configuration properties class. This class allows you to specify default values that can be overridden by external configuration sources.

@ConfigurationProperties(prefix = "my.library")
public class LibraryProperties {
    private String propertyOne = "defaultOne";
    private String propertyTwo = "defaultTwo";

    // Getters and Setters
}

Causes

• Default properties might not be set correctly due to misconfiguration or incorrect prefix in the properties file.
• Lack of proper getters and setters may prevent Spring from loading the properties properly.

Solutions

• Create a class annotated with `@ConfigurationProperties` to bind properties from the application configuration.
• Utilize default values within your properties class to ensure that they are assigned even if not explicitly defined in the configuration files.

Mistake: Not using the `@ConfigurationProperties` annotation.

Solution: Ensure the properties class is properly annotated with `@ConfigurationProperties`.

Mistake: Failure to invoke `@EnableConfigurationProperties` in the Spring Boot application context.

Solution: Explicitly enable the configuration properties class by adding `@EnableConfigurationProperties(LibraryProperties.class)` in your main application class.