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The printed banner is registered as a singleton bean under the following name: springBootBanner. If the SpringApplication defaults are not to your taste, you can instead create a local instance and customize it.

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For example, to turn off the banner, you could write:. It is also possible to configure the SpringApplication by using an application. See Externalized Configuration for details. For a complete list of the configuration options, see the SpringApplication Javadoc. The SpringApplicationBuilder lets you chain together multiple method calls and includes parent and child methods that let you create a hierarchy, as shown in the following example:.

In addition to the usual Spring Framework events, such as ContextRefreshedEvent , a SpringApplication sends some additional application events. Some events are actually triggered before the ApplicationContext is created, so you cannot register a listener on those as a Bean. You can register them with the SpringApplication. ApplicationListener key, as shown in the following example:. An ApplicationStartingEvent is sent at the start of a run but before any processing, except for the registration of listeners and initializers. An ApplicationEnvironmentPreparedEvent is sent when the Environment to be used in the context is known but before the context is created.

An ApplicationContextInitializedEvent is sent when the ApplicationContext is prepared and ApplicationContextInitializers have been called but before any bean definitions are loaded.

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An ApplicationPreparedEvent is sent just before the refresh is started but after bean definitions have been loaded. An ApplicationStartedEvent is sent after the context has been refreshed but before any application and command-line runners have been called. An ApplicationReadyEvent is sent after any application and command-line runners have been called.

It indicates that the application is ready to service requests. In addition to these, the following events are also published after ApplicationPreparedEvent and before ApplicationStartedEvent :. Part of this mechanism ensures that an event published to the listeners in a child context is also published to the listeners in any ancestor contexts.


As a result of this, if your application uses a hierarchy of SpringApplication instances, a listener may receive multiple instances of the same type of application event. To allow your listener to distinguish between an event for its context and an event for a descendant context, it should request that its application context is injected and then compare the injected context with the context of the event. The context can be injected by implementing ApplicationContextAware or, if the listener is a bean, by using Autowired.

A SpringApplication attempts to create the right type of ApplicationContext on your behalf. The algorithm used to determine a WebApplicationType is fairly simple:. If you need to access the application arguments that were passed to SpringApplication. ApplicationArguments bean.

The ApplicationArguments interface provides access to both the raw String[] arguments as well as parsed option and non-option arguments, as shown in the following example:. If you need to run some specific code once the SpringApplication has started, you can implement the ApplicationRunner or CommandLineRunner interfaces.

Both interfaces work in the same way and offer a single run method, which is called just before SpringApplication. The CommandLineRunner interfaces provides access to application arguments as a simple string array, whereas the ApplicationRunner uses the ApplicationArguments interface discussed earlier. The following example shows a CommandLineRunner with a run method:. If several CommandLineRunner or ApplicationRunner beans are defined that must be called in a specific order, you can additionally implement the org.

Ordered interface or use the org. Order annotation. All the standard Spring lifecycle callbacks such as the DisposableBean interface or the PreDestroy annotation can be used. In addition, beans may implement the org. ExitCodeGenerator interface if they wish to return a specific exit code when SpringApplication.

This exit code can then be passed to System. Also, the ExitCodeGenerator interface may be implemented by exceptions. When such an exception is encountered, Spring Boot returns the exit code provided by the implemented getExitCode method. It is possible to enable admin-related features for the application by specifying the spring. You could use this feature to administer your Spring Boot application remotely. This feature could also be useful for any service wrapper implementation. Spring Boot lets you externalize your configuration so that you can work with the same application code in different environments.

You can use properties files, YAML files, environment variables, and command-line arguments to externalize configuration.

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Spring Boot uses a very particular PropertySource order that is designed to allow sensible overriding of values. Properties are considered in the following order:. TestPropertySource annotations on your tests.

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Available on SpringBootTest and the test annotations for testing a particular slice of your application. Application properties outside of your packaged jar application. Application properties packaged inside your jar application. PropertySource annotations on your Configuration classes. To provide a concrete example, suppose you develop a Component that uses a name property, as shown in the following example:.

On your application classpath for example, inside your jar you can have an application. When running in a new environment, an application. For one-off testing, you can launch with a specific command line switch for example, java -jar app. In the preceding example, you end up with acme. You can also supply the JSON as spring. You can also supply the JSON by using a command line argument, as shown in the following example:.

The RandomValuePropertySource is useful for injecting random values for example, into secrets or test cases. It can produce integers, longs, uuids, or strings, as shown in the following example:. The random. If max is provided, then value is the minimum value and max is the maximum value exclusive. By default, SpringApplication converts any command line option arguments that is, arguments starting with -- , such as --server. As mentioned previously, command line properties always take precedence over other property sources.

If you do not want command line properties to be added to the Environment , you can disable them by using SpringApplication. SpringApplication loads properties from application. The list is ordered by precedence properties defined in locations higher in the list override those defined in lower locations. If you do not like application.

You can also refer to an explicit location by using the spring. The following example shows how to specify a different file name:. If spring. Files specified in spring.

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Config locations are searched in reverse order. The resulting search order is the following:.

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When custom config locations are configured by using spring. For example, if spring. Alternatively, when custom config locations are configured by using spring. Additional locations are searched before the default locations. This search ordering lets you specify default values in one configuration file and then selectively override those values in another. You can provide default values for your application in application. These default values can then be overridden at runtime with a different file located in one of the custom locations.

In addition to application. The Environment has a set of default profiles by default, [default] that are used if no active profiles are set. In other words, if no profiles are explicitly activated, then properties from application-default. Profile-specific properties are loaded from the same locations as standard application. If several profiles are specified, a last-wins strategy applies. For example, profiles specified by the spring.

The values in application. Spring Boot does not provide any built in support for encrypting property values, however, it does provide the hook points necessary to modify values contained in the Spring Environment. The EnvironmentPostProcessor interface allows you to manipulate the Environment before the application starts.