Runtime property

As explained in Quarkus in Action

A runtime property is a configuration value that can be supplied or overridden when an application executes.

A runtime property is a configuration value supplied or overridden when an application starts. In Quarkus, runtime properties remain changeable after the build because their effects depend on runtime conditions, unlike build-time-only properties. section 12.1.3

The distinction protects consistency. Build-time properties have already influenced generated application artifacts and cannot be changed meaningfully at startup; Quarkus warns when an override is attempted. Runtime properties handle values that cannot be fixed during compilation, such as the port used by an open HTTP socket. section 12.1.3

Changing the HTTP port

Use quarkus.http.port as a runtime property to select the port for the main HTTP interface when the application starts. The running Quarkus application can therefore listen on a deployment-specific port rather than embedding that port in the built artifact. section 12.1.3

Figure 2.7 Quarkus build time vs. runtime processing. Quarkus moves as much processing as possible to build time.

Compare the processing moved to build time with the configuration that must remain available when the application starts. section 2.5

How Quarkus in Action covers it

How deep it goes

Defines runtime properties, contrasts them with build-time properties, and explains the HTTP-port constraint without detailing declaration syntax.

Examples

Uses quarkus.http.port as the concrete example of a value selected when the HTTP interface starts.

What it assumes

Assumes familiarity with application configuration and distinguishes MicroProfile Config from the Quarkus-managed configuration model.

What you can do after

Apply it via Quarkus configuration to vary an application's listening port at startup.

How it connects

Connects runtime properties with MicroProfile Config, build-time processing, and ahead-of-time compilation.

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Related concepts

• build-time propertycontrasts with · A build-time property is a configuration value whose effect is fixed or incorporated while an application is being built.

This explainer was generated by Manning's knowledge graph from the text of Quarkus in Action. The section links point to the parts of the book it draws on.