Application properties
Application properties are named configuration settings that provide values used to configure an application's behavior.
Quarkus in Action
application.properties is a Java application configuration file containing key-value property settings.
- How it is used
- Centralizes Quarkus extension settings and application-specific values while allowing deployment environments to override packaged defaults.
- How deep it goes
- Works through injection, override priority, profiles, and build-time manifest settings; defers exhaustive extension options and exact environment-variable mapping rules to documentation.
- Examples
- Shows an injected greeting, system-property and environment-variable overrides, production Keycloak settings, and a configured REST client URL.
- What you can do after
- Apply it via Quarkus configuration and MicroProfile Config injection to replace hard-coded values and adapt service settings across environments.
Read how Quarkus in Action explains application properties →
Spring in Action, Sixth Edition
application.properties is a conventional Spring Boot configuration file that expresses application settings as properties.
- How it is used
- Configures Spring Boot components and application beans through values in an application properties file.
- How deep it goes
- Works through a port setting, component settings, custom property binding, and profile-specific files; leaves detailed Logback configuration aside.
- Examples
- Uses `server.port=9090`, database connection properties, logging settings, and an order-list page-size property.
- What you can do after
- Operate/configure a Spring Boot application by setting component values and separating common from profile-specific properties.
Read how Spring in Action, Sixth Edition explains application properties →
Related concepts
- Spring Boot autoconfigurationconfigures · Spring Boot autoconfiguration is the conditional automatic selection and configuration of application components based on dependencies, properties, environment, and application context.
- WebApplicationused by · WebApplication is an ASP.NET Core application type that hosts configured services, runs the web server, and exposes the HTTP request-processing pipeline.
- @ConfigurationPropertiesused by · @ConfigurationProperties is a Spring Boot annotation that binds externally defined configuration properties with a specified prefix to a bean's fields or properties.
- configuration editorconfigured by · A configuration editor is an interface for viewing and modifying an application's configuration settings.
- client secretconfigures · A client secret is confidential credential information that an application or service client presents to an authorization or service provider to authenticate itself.
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