org.springframework.boot

Class SpringApplication

java.lang.Object

org.springframework.boot.SpringApplication

public class SpringApplication
extends Object

Classes that can be used to bootstrap and launch a Spring application from a Java main method. By default class will perform the following steps to bootstrap your application:

• Create an appropriate ApplicationContext instance (depending on your classpath)
• Register a CommandLinePropertySource to expose command line arguments as Spring properties
• Refresh the application context, loading all singleton beans
• Trigger any CommandLineRunner beans

In most circumstances the static run(Object, String[]) method can be called directly from your main method to bootstrap your application:

 @Configuration
 @EnableAutoConfiguration
 public class MyApplication  {

 // ... Bean definitions

 public static void main(String[] args) throws Exception {
   SpringApplication.run(MyApplication.class, args);
 }
 

For more advanced configuration a SpringApplication instance can be created and customized before being run:

 public static void main(String[] args) throws Exception {
   SpringApplication app = new SpringApplication(MyApplication.class);
   // ... customize app settings here
   app.run(args)
 }
 

SpringApplications can read beans from a variety of different sources. It is generally recommended that a single @Configuration class is used to bootstrap your application, however, any of the following sources can also be used:

• Class - A Java class to be loaded by AnnotatedBeanDefinitionReader
• Resource - An XML resource to be loaded by XmlBeanDefinitionReader, or a groovy script to be loaded by GroovyBeanDefinitionReader
• Package - A Java package to be scanned by ClassPathBeanDefinitionScanner
• CharSequence - A class name, resource handle or package name to loaded as appropriate. If the CharSequence cannot be resolved to class and does not resolve to a Resource that exists it will be considered a Package.

Author:

Phillip Webb, Dave Syer, Andy Wilkinson, Christian Dupuis

See Also:

run(Object, String[]), run(Object[], String[]), SpringApplication(Object...)

Field Summary

Fields

Modifier and Type	Field and Description
static String	DEFAULT_WEB_CONTEXT_CLASS

Constructor Summary

Constructors

Constructor and Description
SpringApplication(Object... sources) Create a new SpringApplication instance.
SpringApplication(ResourceLoader resourceLoader, Object... sources) Create a new SpringApplication instance.

Method Summary

Methods

Modifier and Type	Method and Description
void	addInitializers(ApplicationContextInitializer<?>... initializers) Add ApplicationContextInitializers to be applied to the Spring ApplicationContext.
void	addListeners(ApplicationListener<?>... listeners) Add ApplicationListeners to be applied to the SpringApplication and registered with the ApplicationContext.
protected void	afterRefresh(ConfigurableApplicationContext context, String[] args)
protected void	applyInitializers(ConfigurableApplicationContext context) Apply any ApplicationContextInitializers to the context before it is refreshed.
protected void	configureEnvironment(ConfigurableEnvironment environment, String[] args) Template method delegating to configurePropertySources(ConfigurableEnvironment, String[]) and configureProfiles(ConfigurableEnvironment, String[]) in that order.
protected void	configureProfiles(ConfigurableEnvironment environment, String[] args) Configure which profiles are active (or active by default) for this application environment.
protected void	configurePropertySources(ConfigurableEnvironment environment, String[] args) Add, remove or re-order any PropertySources in this application's environment.
protected ConfigurableApplicationContext	createApplicationContext() Strategy method used to create the ApplicationContext.
protected org.springframework.boot.BeanDefinitionLoader	createBeanDefinitionLoader(BeanDefinitionRegistry registry, Object[] sources) Factory method used to create the BeanDefinitionLoader.
static int	exit(ApplicationContext context, ExitCodeGenerator... exitCodeGenerators) Static helper that can be used to exit a SpringApplication and obtain a code indicating success (0) or otherwise.
protected org.apache.commons.logging.Log	getApplicationLog() Returns the Log for the application.
ClassLoader	getClassLoader() Either the ClassLoader that will be used in the ApplicationContext (if resourceLoader is set, or the context class loader (if not null), or the loader of the Spring ClassUtils class.
Set<ApplicationContextInitializer<?>>	getInitializers() Returns read-only ordered Set of the ApplicationContextInitializers that will be applied to the Spring ApplicationContext.
Set<ApplicationListener<?>>	getListeners() Returns read-only ordered Set of the ApplicationListeners that will be applied to the SpringApplication and registered with the ApplicationContext .
ResourceLoader	getResourceLoader() The ResourceLoader that will be used in the ApplicationContext.
Set<Object>	getSources() Returns a mutable set of the sources that will be added to an ApplicationContext when run(String...) is called.
protected void	load(ApplicationContext context, Object[] sources) Load beans into the application context.
protected void	logStartupInfo(boolean isRoot) Called to log startup information, subclasses may override to add additional logging.
static void	main(String[] args) A basic main that can be used to launch an application.
protected void	postProcessApplicationContext(ConfigurableApplicationContext context) Apply any relevant post processing the ApplicationContext.
protected void	printBanner() Print a simple banner message to the console.
protected void	printBanner(Environment environment) Print a custom banner message to the console, optionally extracting its location or content from the Environment (banner.location and banner.charset).
protected void	refresh(ApplicationContext applicationContext) Refresh the underlying ApplicationContext.
static ConfigurableApplicationContext	run(Object[] sources, String[] args) Static helper that can be used to run a SpringApplication from the specified sources using default settings and user supplied arguments.
static ConfigurableApplicationContext	run(Object source, String... args) Static helper that can be used to run a SpringApplication from the specified source using default settings.
ConfigurableApplicationContext	run(String... args) Run the Spring application, creating and refreshing a new ApplicationContext.
void	setAddCommandLineProperties(boolean addCommandLineProperties) Sets if a CommandLinePropertySource should be added to the application context in order to expose arguments.
void	setAdditionalProfiles(String... profiles) Set additional profile values to use (on top of those set in system or command line properties).
void	setApplicationContextClass(Class<? extends ConfigurableApplicationContext> applicationContextClass) Sets the type of Spring ApplicationContext that will be created.
void	setBeanNameGenerator(BeanNameGenerator beanNameGenerator) Sets the bean name generator that should be used when generating bean names.
void	setDefaultProperties(Map<String,Object> defaultProperties) Set default environment properties which will be used in addition to those in the existing Environment.
void	setDefaultProperties(Properties defaultProperties) Convenient alternative to setDefaultProperties(Map).
void	setEnvironment(ConfigurableEnvironment environment) Sets the underlying environment that should be used with the created application context.
void	setHeadless(boolean headless) Sets if the application is headless and should not instantiate AWT.
void	setInitializers(Collection<? extends ApplicationContextInitializer<?>> initializers) Sets the ApplicationContextInitializer that will be applied to the Spring ApplicationContext.
void	setListeners(Collection<? extends ApplicationListener<?>> listeners) Sets the ApplicationListeners that will be applied to the SpringApplication and registered with the ApplicationContext.
void	setLogStartupInfo(boolean logStartupInfo) Sets if the application information should be logged when the application starts.
void	setMainApplicationClass(Class<?> mainApplicationClass) Set a specific main application class that will be used as a log source and to obtain version information.
void	setRegisterShutdownHook(boolean registerShutdownHook) Sets if the created ApplicationContext should have a shutdown hook registered.
void	setResourceLoader(ResourceLoader resourceLoader) Sets the ResourceLoader that should be used when loading resources.
void	setShowBanner(boolean showBanner) Sets if the Spring banner should be displayed when the application runs.
void	setSources(Set<Object> sources) The sources that will be used to create an ApplicationContext.
void	setWebEnvironment(boolean webEnvironment) Sets if this application is running within a web environment.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DEFAULT_WEB_CONTEXT_CLASS

public static final String DEFAULT_WEB_CONTEXT_CLASS

See Also:

Constant Field Values

Constructor Detail

SpringApplication

public SpringApplication(Object... sources)

Create a new SpringApplication instance. The application context will load beans from the specified sources (see class-level documentation for details. The instance can be customized before calling run(String...).

Parameters:

sources - the bean sources

See Also:

run(Object, String[]), SpringApplication(ResourceLoader, Object...)

SpringApplication

public SpringApplication(ResourceLoader resourceLoader,
                 Object... sources)

Create a new SpringApplication instance. The application context will load beans from the specified sources (see class-level documentation for details. The instance can be customized before calling run(String...).

Parameters:

resourceLoader - the resource loader to use

sources - the bean sources

See Also:

run(Object, String[]), SpringApplication(ResourceLoader, Object...)

Method Detail

run

public ConfigurableApplicationContext run(String... args)

Run the Spring application, creating and refreshing a new ApplicationContext.

Parameters:

args - the application arguments (usually passed from a Java main method)

Returns:

a running ApplicationContext

configureEnvironment

protected void configureEnvironment(ConfigurableEnvironment environment,
                        String[] args)

Template method delegating to configurePropertySources(ConfigurableEnvironment, String[]) and configureProfiles(ConfigurableEnvironment, String[]) in that order. Override this method for complete control over Environment customization, or one of the above for fine-grained control over property sources or profiles, respectively.

Parameters:

environment - this application's environment

args - arguments passed to the run method

See Also:

configureProfiles(ConfigurableEnvironment, String[]), configurePropertySources(ConfigurableEnvironment, String[])

configurePropertySources

protected void configurePropertySources(ConfigurableEnvironment environment,
                            String[] args)

Add, remove or re-order any PropertySources in this application's environment.

Parameters:

environment - this application's environment

args - arguments passed to the run method

See Also:

configureEnvironment(ConfigurableEnvironment, String[])

configureProfiles

protected void configureProfiles(ConfigurableEnvironment environment,
                     String[] args)

Configure which profiles are active (or active by default) for this application environment. Consider overriding this method to programmatically enforce profile rules and semantics, such as ensuring mutual exclusivity of profiles (e.g. 'dev' OR 'prod', but never both).

Parameters:

environment - this application's environment

args - arguments passed to the run method

See Also:

configureEnvironment(ConfigurableEnvironment, String[])

printBanner

protected void printBanner(Environment environment)

Print a custom banner message to the console, optionally extracting its location or content from the Environment (banner.location and banner.charset). The defaults are banner.location=classpath:banner.txt, banner.charest=UTF-8. If the banner file does not exist or cannot be printed, a simple default is created.

See Also:

setShowBanner(boolean), printBanner()

printBanner

protected void printBanner()

Print a simple banner message to the console. Subclasses can override this method to provide additional or alternative banners.

See Also:

setShowBanner(boolean), printBanner(Environment)

createApplicationContext

protected ConfigurableApplicationContext createApplicationContext()

Strategy method used to create the ApplicationContext. By default this method will respect any explicitly set application context or application context class before falling back to a suitable default.

Returns:

the application context (not yet refreshed)

See Also:

setApplicationContextClass(Class)

postProcessApplicationContext

protected void postProcessApplicationContext(ConfigurableApplicationContext context)

Apply any relevant post processing the ApplicationContext. Subclasses can apply additional processing as required.

Parameters:

context - the application context

applyInitializers

protected void applyInitializers(ConfigurableApplicationContext context)

Apply any ApplicationContextInitializers to the context before it is refreshed.

Parameters:

context - the configured ApplicationContext (not refreshed yet)

See Also:

ConfigurableApplicationContext.refresh()

logStartupInfo

protected void logStartupInfo(boolean isRoot)

Called to log startup information, subclasses may override to add additional logging.

Parameters:

isRoot - true if this application is the root of a context hierarchy

getApplicationLog

protected org.apache.commons.logging.Log getApplicationLog()

Returns the Log for the application. By default will be deduced.

Returns:

the application log

load

protected void load(ApplicationContext context,
        Object[] sources)

Load beans into the application context.

Parameters:

context - the context to load beans into

sources - the sources to load

getResourceLoader

public ResourceLoader getResourceLoader()

The ResourceLoader that will be used in the ApplicationContext.

Returns:

the resourceLoader the resource loader that will be used in the ApplicationContext (or null if the default)

getClassLoader

public ClassLoader getClassLoader()

Either the ClassLoader that will be used in the ApplicationContext (if resourceLoader is set, or the context class loader (if not null), or the loader of the Spring ClassUtils class.

Returns:

a ClassLoader (never null)

createBeanDefinitionLoader

protected org.springframework.boot.BeanDefinitionLoader createBeanDefinitionLoader(BeanDefinitionRegistry registry,
                                                                       Object[] sources)

Factory method used to create the BeanDefinitionLoader.

Parameters:

registry - the bean definition registry

sources - the sources to load

Returns:

the BeanDefinitionLoader that will be used to load beans

refresh

protected void refresh(ApplicationContext applicationContext)

Refresh the underlying ApplicationContext.

Parameters:

applicationContext - the application context to refresh

afterRefresh

protected void afterRefresh(ConfigurableApplicationContext context,
                String[] args)

setMainApplicationClass

public void setMainApplicationClass(Class<?> mainApplicationClass)

Set a specific main application class that will be used as a log source and to obtain version information. By default the main application class will be deduced. Can be set to null if there is no explicit application class.

Parameters:

mainApplicationClass - the mainApplicationClass to set or null

setWebEnvironment

public void setWebEnvironment(boolean webEnvironment)

Sets if this application is running within a web environment. If not specified will attempt to deduce the environment based on the classpath.

Parameters:

webEnvironment - if the application is running in a web environment

setHeadless

public void setHeadless(boolean headless)

Sets if the application is headless and should not instantiate AWT. Defaults to true to prevent java icons appearing.

Parameters:

headless - if the application is headless

setRegisterShutdownHook

public void setRegisterShutdownHook(boolean registerShutdownHook)

Sets if the created ApplicationContext should have a shutdown hook registered. Defaults to true to ensure that JVM shutdowns are handled gracefully.

setShowBanner

public void setShowBanner(boolean showBanner)

Sets if the Spring banner should be displayed when the application runs. Defaults to true.

Parameters:

showBanner - if the banner should be shown

See Also:

printBanner()

setLogStartupInfo

public void setLogStartupInfo(boolean logStartupInfo)

Sets if the application information should be logged when the application starts. Defaults to true

Parameters:

logStartupInfo - if startup info should be logged.

setAddCommandLineProperties

public void setAddCommandLineProperties(boolean addCommandLineProperties)

Sets if a CommandLinePropertySource should be added to the application context in order to expose arguments. Defaults to true.

Parameters:

addCommandLineProperties - if command line arguments should be exposed

setDefaultProperties

public void setDefaultProperties(Map<String,Object> defaultProperties)

Set default environment properties which will be used in addition to those in the existing Environment.

Parameters:

defaultProperties - the additional properties to set

setDefaultProperties

public void setDefaultProperties(Properties defaultProperties)

Convenient alternative to setDefaultProperties(Map).

Parameters:

defaultProperties - some Properties

setAdditionalProfiles

public void setAdditionalProfiles(String... profiles)

Set additional profile values to use (on top of those set in system or command line properties).

Parameters:

profiles - the additional profiles to set

setBeanNameGenerator

public void setBeanNameGenerator(BeanNameGenerator beanNameGenerator)

Sets the bean name generator that should be used when generating bean names.

Parameters:

beanNameGenerator - the bean name generator

setEnvironment

public void setEnvironment(ConfigurableEnvironment environment)

Sets the underlying environment that should be used with the created application context.

Parameters:

environment - the environment

getSources

public Set<Object> getSources()

Returns a mutable set of the sources that will be added to an ApplicationContext when run(String...) is called.

Returns:

the sources the application sources.

See Also:

SpringApplication(Object...)

setSources

public void setSources(Set<Object> sources)

The sources that will be used to create an ApplicationContext. A valid source is one of: a class, class name, package, package name, or an XML resource location. Can also be set using constructors and static convenience methods (e.g. run(Object[], String[])).

NOTE: sources defined here will be used in addition to any sources specified on construction.

Parameters:

sources - the sources to set

See Also:

SpringApplication(Object...)

setResourceLoader

public void setResourceLoader(ResourceLoader resourceLoader)

Sets the ResourceLoader that should be used when loading resources.

Parameters:

resourceLoader - the resource loader

setApplicationContextClass

public void setApplicationContextClass(Class<? extends ConfigurableApplicationContext> applicationContextClass)

Sets the type of Spring ApplicationContext that will be created. If not specified defaults to DEFAULT_WEB_CONTEXT_CLASS for web based applications or AnnotationConfigApplicationContext for non web based applications.

Parameters:

applicationContextClass - the context class to set

setInitializers

public void setInitializers(Collection<? extends ApplicationContextInitializer<?>> initializers)

Sets the ApplicationContextInitializer that will be applied to the Spring ApplicationContext.

Parameters:

initializers - the initializers to set

addInitializers

public void addInitializers(ApplicationContextInitializer<?>... initializers)

Add ApplicationContextInitializers to be applied to the Spring ApplicationContext.

Parameters:

initializers - the initializers to add

getInitializers

public Set<ApplicationContextInitializer<?>> getInitializers()

Returns read-only ordered Set of the ApplicationContextInitializers that will be applied to the Spring ApplicationContext.

Returns:

the initializers

setListeners

public void setListeners(Collection<? extends ApplicationListener<?>> listeners)

Sets the ApplicationListeners that will be applied to the SpringApplication and registered with the ApplicationContext.

Parameters:

listeners - the listeners to set

addListeners

public void addListeners(ApplicationListener<?>... listeners)

Add ApplicationListeners to be applied to the SpringApplication and registered with the ApplicationContext.

Parameters:

listeners - the listeners to add

getListeners

public Set<ApplicationListener<?>> getListeners()

Returns read-only ordered Set of the ApplicationListeners that will be applied to the SpringApplication and registered with the ApplicationContext .

Returns:

the listeners

run

public static ConfigurableApplicationContext run(Object source,
                                 String... args)

Static helper that can be used to run a SpringApplication from the specified source using default settings.

Parameters:

source - the source to load

args - the application arguments (usually passed from a Java main method)

Returns:

the running ApplicationContext

run

public static ConfigurableApplicationContext run(Object[] sources,
                                 String[] args)

Static helper that can be used to run a SpringApplication from the specified sources using default settings and user supplied arguments.

Parameters:

sources - the sources to load

args - the application arguments (usually passed from a Java main method)

Returns:

the running ApplicationContext

main

public static void main(String[] args)
                 throws Exception

A basic main that can be used to launch an application. This method is useful when application sources are defined via a --spring.main.sources command line argument.

Most developers will want to define their own main method can call the run method instead.

Parameters:

args - command line arguments

Throws:

Exception

See Also:

run(Object[], String[]), run(Object, String...)

exit

public static int exit(ApplicationContext context,
       ExitCodeGenerator... exitCodeGenerators)

Static helper that can be used to exit a SpringApplication and obtain a code indicating success (0) or otherwise. Does not throw exceptions but should print stack traces of any encountered. Applies the specified ExitCodeGenerator in addition to any Spring beans that implement ExitCodeGenerator. In the case of multiple exit codes the highest value will be used (or if all values are negative, the lowest value will be used)

Parameters:

context - the context to close if possible

exitCodeGenerators - exist code generators

Returns:

the outcome (0 if successful)