BeanFactory vs ApplicationContext

Question

I m pretty new to the Spring Framework  I ve been playing around with it and putting a few samples apps together for the purposes of evaluating Spring MVC for use in an upcoming company project  So far I really like what I see in Spring MVC  seems very easy to use and encourages you to write classes that are very unit test-friendly   Just as an exercise  I m writing a main method for one of my sample test projects  One thing I m unclear about is the exact differences between BeanFactory and ApplicationContext - which is appropriate to use in which conditions   I understand that ApplicationContext extends BeanFactory  but if I m just writing a simple main method  do I need the extra functionality that ApplicationContext provides  And just exactly what kind of extra functionality does ApplicationContext provide   In addition to answering  which should I use in a main   method   are there any standards or guidelines as far as which implementation I should use in such a scenario  Should my main   method be written to depend on the bean application configuration to be in XML format - is that a safe assumption  or am I locking the user into something specific   And does this answer change in a web environment - if any of my classes needed to be aware of Spring  are they more likely to need ApplicationContext   Thanks for any help  I know a lot of these questions are probably answered in the reference manual  but I m having a hard time finding a clear breakdown of these two interfaces and the pros cons of each without reading thru the manual with a fine-tooth comb

User · Answer

ApplicationContext  It loads spring beans configured in spring configuration file and manages the life cycle of the spring bean as and WHEN CONTAINER STARTS It won t wait until getBean  springbeanref   is called   BeanFactory  It loads spring beans configured in spring configuration file manages the life cycle of the spring bean when we call the getBean  springbeanref   So when we call the getBean  springbeanref   at the time of spring bean life cycle starts

User · Answer

ApplicationContext is a big brother of BeanFactory and this would all thing that BeanFactory are provide plus many other things   In addition to standard org springframework beans factory BeanFactory lifecycle capabilities  ApplicationContext implementations detect and   invoke ApplicationContextAware beans as well as ResourceLoaderAware  ApplicationEventPublisherAware and MessageSourceAware beans

User · Answer

For the most part  ApplicationContext is preferred unless you need to save resources  like on a mobile application   I m not sure about depending on XML format  but I m pretty sure the most common implementations of ApplicationContext are the XML ones such as ClassPathXmlApplicationContext  XmlWebApplicationContext  and FileSystemXmlApplicationContext   Those are the only three I ve ever used   If your developing a web app  it s safe to say you ll need to use XmlWebApplicationContext   If you want your beans to be aware of Spring  you can have them implement BeanFactoryAware and or ApplicationContextAware for that  so you can use either BeanFactory or ApplicationContext and choose which interface to implement

User · Answer

Spring provides two kinds of IOC container  one is XMLBeanFactory and other is ApplicationContext         --------------------------------------- ----------------- --------------------------------                                            BeanFactory             ApplicationContext          --------------------------------------- ----------------- --------------------------------    Annotation support                      No                Yes                                BeanPostProcessor Registration          Manual            Automatic                          implementation                          XMLBeanFactory    ClassPath FileSystem WebXmlApplicationContext    internationalization                    No                Yes                                Enterprise services                     No                Yes                                ApplicationEvent publication            No                Yes                               --------------------------------------- ----------------- --------------------------------       FileSystemXmlApplicationContext Beans loaded through the full path  ClassPathXmlApplicationContext Beans loaded through the CLASSPATH XMLWebApplicationContext and AnnotationConfigWebApplicationContext beans loaded through the web application context  AnnotationConfigApplicationContext Loading Spring beans from Annotation based configuration      example   ApplicationContext applicationContext   new AnnotationConfigApplicationContext BeansConfiguration class      ApplicationContext is the container initialized by a ContextLoaderListener or ContextLoaderServlet defined in a web xml and ContextLoaderPlugin defined in struts-config xml    Note  XmlBeanFactory is deprecated as of Spring 3 1 in favor of DefaultListableBeanFactory and XmlBeanDefinitionReader

User · Answer

I think it is worth mentioning that since Spring 3  if you want to create a factory  you can also use the  configuration annotation combined with the proper  scope   Configuration public class MyFactory         Bean      Scope  prototype       public MyClass create             return new MyClass              Your factory should be visible by Spring container using the  ComponentScan annotation or xml configuration  Spring bean scopes article from baeldung site

User · Answer

ApplicationContext is more preferred way than BeanFactory In new Spring versions BeanFactory is replaced with ApplicationContext  But still BeanFactory exists for backward compatability ApplicationContext extends BeanFactory and has the following benefits   it supports internationalization for text messages it supports event publication to the registered listeners access to the resources such as URLs and files

User · Answer

I need to explain the BeanFactory  amp  ApplicationContext      BeanFactory  BeanFactory is root interface for accessing the SpringBean Container There is basic client view of a bean container  That interface is implemented by the object class that holds the number of beans definitions  and each uniquely identify by the String name Depending the Bean definition the factory will return the instance that instance may be the instance of contained object or a single shared instance  Which type of instance will be return depends of bean factory configuration  Normally Bean factory will load the all the all the beans definition  which stored in the configuration source like XML   etc        BeanFactory is a simplest container providing the basic support for Dependency Injection  Application Context Application context is a central interface with in the spring application that provide the configuration information to the application  It implements the Bean Factory Interface       Application context is an advance container its add advance level of enterprise specific functionality such as ability to resolve the textual message from the property file    etc  An ApplicationContext provides   Bean factory methods for accessing application components  Inherited from ListableBeanFactory  The ability to load file resources in a generic fashion  Inherited from the ResourceLoader interface  The ability to publish events to registered listeners  Inherited from the ApplicationEventPublisher interface  The ability to resolve messages  supporting internationalization  Inherited from the MessageSource interface  Inheritance from a parent context  Definitions in a descendant context will always take priority  This means  for example  that a single parent context can be used by an entire web application  while each servlet has its own child context that is independent of that of any other servlet  In addition to standard BeanFactory lifecycle capabilities  ApplicationContext implementations detect and invoke ApplicationContextAware beans as well as ResourceLoaderAware  ApplicationEventPublisherAware and MessageSourceAware beans

User · Answer

Feature Matrix of Bean Factory vs Application Context sourced from spring docs    Screenshot of features of BeanFacotry and ApplicationContext

User · Answer

The spring docs are great on this  3 8 1  BeanFactory or ApplicationContext   They have a table with a comparison  I ll post a snippet   Bean Factory   Bean instantiation wiring   Application Context   Bean instantiation wiring Automatic BeanPostProcessor registration Automatic BeanFactoryPostProcessor registration Convenient MessageSource access  for i18n  ApplicationEvent publication   So if you need any of the points presented on the Application Context side  you should use ApplicationContext

User · Answer

To add onto what Miguel Ping answered  here is another section from the documentation that answers this as well      Short version  use an ApplicationContext unless you have a really good reason for not doing so  For those of you that are looking for slightly more depth as to the  but why  of the above recommendation  keep reading     posting this for any future Spring novices who might read this question

User · Answer

To add onto what Miguel Ping answered  here is another section from the documentation that answers this as well      Short version  use an ApplicationContext unless you have a really good reason for not doing so  For those of you that are looking for slightly more depth as to the  but why  of the above recommendation  keep reading     posting this for any future Spring novices who might read this question

User · Answer

BeanFactory and ApplicationContext both are ways to get beans from your spring IOC container but still there are some difference   BeanFactory is the actual container which instantiates  configures  and manages a number of bean s  These beans  are typically collaborate with one another  and thus have dependencies between themselves  These dependencies are reflected in the configuration data used by the BeanFactory   BeanFactory and ApplicationContext both are Java interfaces and ApplicationContext extends BeanFactory  Both of them are configuration using XML configuration files  In short BeanFactory provides basic Inversion of control IoC  and Dependency Injection  DI  features while ApplicationContext provides advanced features   A BeanFactory is represented by the interface  org springframework beans factory  Where BeanFactory  for which there are multiple implementations   ClassPathResource resource   new ClassPathResource  appConfig xml    XmlBeanFactory factory   new XmlBeanFactory resource     DIFFERENCE   BeanFactory instantiate bean when you call getBean   method while ApplicationContext instantiate Singleton bean when container is started   It doesn t wait for getBean   to be called  BeanFactory doesn t provide support for internationalization but ApplicationContext provides support for it  Another difference between BeanFactory vs ApplicationContext is ability to publish event to beans that are registered as listener  One of the popular implementation of BeanFactory interface is XMLBeanFactory while one of the popular implementation of ApplicationContext interface is ClassPathXmlApplicationContext  If you are using auto wiring and using BeanFactory than you need to register AutoWiredBeanPostProcessor using API which you can configure in XML if you are using  ApplicationContext  In summary BeanFactory is OK for testing and non production use but ApplicationContext is more feature rich container implementation and should be favored over BeanFactory BeanFactory by default its support Lazy loading and ApplicationContext by default support Aggresive loading

User · Answer

I think it is worth mentioning that since Spring 3  if you want to create a factory  you can also use the  configuration annotation combined with the proper  scope   Configuration public class MyFactory         Bean      Scope  prototype       public MyClass create             return new MyClass              Your factory should be visible by Spring container using the  ComponentScan annotation or xml configuration  Spring bean scopes article from baeldung site

User · Answer

For the most part  ApplicationContext is preferred unless you need to save resources  like on a mobile application   I m not sure about depending on XML format  but I m pretty sure the most common implementations of ApplicationContext are the XML ones such as ClassPathXmlApplicationContext  XmlWebApplicationContext  and FileSystemXmlApplicationContext   Those are the only three I ve ever used   If your developing a web app  it s safe to say you ll need to use XmlWebApplicationContext   If you want your beans to be aware of Spring  you can have them implement BeanFactoryAware and or ApplicationContextAware for that  so you can use either BeanFactory or ApplicationContext and choose which interface to implement

User · Answer

In a real-time scenario  the difference between the Spring IOC Core container  BeanFactory  and Advanced J2EE container  ApplicationContext  are as follows    BeanFactory will create objects for the beans  i e   for POJO classes  mentioned in the spring xml file   lt bean gt  lt  bean gt   only when you call the  getBean   method  but whereas ApplicationContext creates the objects for all the beans   lt bean gt  lt  bean gt  if its scope is not explicitly mentioned as  Prototype   configured in the spring xml while loading the spring xml file itself  BeanFactory   Lazy container because it creates the objects for the beans only when you explicitly call from the user main class         Using core Container - Lazy container - Because it creates the bean objects On-Demand       creating a resource Resource r    Resource  new ClassPathResource  com spring resources spring xml      creating BeanFactory  BeanFactory factory new XmlBeanFactory r      Getting the bean for the POJO class  HelloWorld java  HelloWorld worldObj1    HelloWorld  factory getBean  test      ApplicationContext   Eager container because of creating the objects of all singleton beans while loading the spring xml file itself   ApplicationContext context   new ClassPathXmlApplicationContext  com ioc constructorDI resources spring xml     Technically  using ApplicationContext is recommended because in real-time applications  the bean objects will be created while the application is getting started in the server itself  This reduces the response time for the user request as the objects are already available to respond

User · Answer

Spring provides two kinds of IOC container  one is XMLBeanFactory and other is ApplicationContext         --------------------------------------- ----------------- --------------------------------                                            BeanFactory             ApplicationContext          --------------------------------------- ----------------- --------------------------------    Annotation support                      No                Yes                                BeanPostProcessor Registration          Manual            Automatic                          implementation                          XMLBeanFactory    ClassPath FileSystem WebXmlApplicationContext    internationalization                    No                Yes                                Enterprise services                     No                Yes                                ApplicationEvent publication            No                Yes                               --------------------------------------- ----------------- --------------------------------       FileSystemXmlApplicationContext Beans loaded through the full path  ClassPathXmlApplicationContext Beans loaded through the CLASSPATH XMLWebApplicationContext and AnnotationConfigWebApplicationContext beans loaded through the web application context  AnnotationConfigApplicationContext Loading Spring beans from Annotation based configuration      example   ApplicationContext applicationContext   new AnnotationConfigApplicationContext BeansConfiguration class      ApplicationContext is the container initialized by a ContextLoaderListener or ContextLoaderServlet defined in a web xml and ContextLoaderPlugin defined in struts-config xml    Note  XmlBeanFactory is deprecated as of Spring 3 1 in favor of DefaultListableBeanFactory and XmlBeanDefinitionReader

User · Answer

a   One difference between bean factory and application context is that former only instantiate bean when you call getBean   method while ApplicationContext instantiates Singleton bean when the container is started  It doesn t wait for getBean to be called   b        ApplicationContext context   new ClassPathXmlApplicationContext  spring xml      or  ApplicationContext context   new ClassPathXmlApplicationContext  spring dao xml   spring service xml     You can use one or more xml file depending on your project requirement  As I am here using two xml files i e  one for configuration details for service classes other for dao classes  Here ClassPathXmlApplicationContext is child of ApplicationContext   c   BeanFactory Container is basic container  it can only create objects and inject Dependencies  But we can   t attach other services like security  transaction  messaging etc  to provide all the services we have to use ApplicationContext Container    d   BeanFactory doesn t provide support for internationalization i e  i18n but ApplicationContext provides support for it    e   BeanFactory Container doesn t support the feature of AutoScanning  Support Annotation based dependency Injection   but ApplicationContext Container supports    f   Beanfactory Container will not create a bean object until the request time  It means Beanfactory Container loads beans lazily  While ApplicationContext Container creates objects of Singleton bean at the time of loading only  It means there is early loading    g   Beanfactory Container support only two scopes  singleton  amp  prototype  of the beans  But ApplicationContext Container supports all the beans scope

User · Answer

Difference between BeanFactory and ApplicationContext are following    BeanFactory uses lazy initialization but ApplicationContext uses eager initialization  In case of BeanFactory  bean is created when you call getBeans   method  but bean is created upfront in case of ApplicationContext when the ApplicationContext object is created  BeanFactory explicitly provide a resource object using syntax but ApplicationContext creates and manages resource objects on its own  BeanFactory doesnt support internatiolization but ApplicationContext supports internationalization  With BeanFactory annotation based dependency injection is not supported but annotation based dependency injection is supported in ApplicationContext    Using BeanFactory   BeanFactory beanfactory   new XMLBeanFactory new FileSystemResource  spring xml      Triangle triangle   Triangle beanFactory getBean  triangle      Using ApplicationContext   ApplicationContext context   new ClassPathXMLApplicationContext  spring xml   Triangle triangle   Triangle context getBean  triangle

User · Answer

ApplicationContext is more preferred way than BeanFactory In new Spring versions BeanFactory is replaced with ApplicationContext  But still BeanFactory exists for backward compatability ApplicationContext extends BeanFactory and has the following benefits   it supports internationalization for text messages it supports event publication to the registered listeners access to the resources such as URLs and files

User · Answer

The spring docs are great on this  3 8 1  BeanFactory or ApplicationContext   They have a table with a comparison  I ll post a snippet   Bean Factory   Bean instantiation wiring   Application Context   Bean instantiation wiring Automatic BeanPostProcessor registration Automatic BeanFactoryPostProcessor registration Convenient MessageSource access  for i18n  ApplicationEvent publication   So if you need any of the points presented on the Application Context side  you should use ApplicationContext

User · Answer

To me  the primary difference to choose BeanFactory over ApplicationContext seems to be that ApplicationContext will pre-instantiate all of the beans  From the Spring docs      Spring sets properties and resolves dependencies as late as possible  when the bean is actually created  This means that a Spring container which has loaded correctly can later generate an exception when you request an object if there is a problem creating that object or one of its dependencies  For example  the bean throws an exception as a result of a missing or invalid property  This potentially delayed visibility of some configuration issues is why ApplicationContext implementations by default pre-instantiate singleton beans  At the cost of some upfront time and memory to create these beans before they are actually needed  you discover configuration issues when the ApplicationContext is created  not later  You can still override this default behavior so that singleton beans will lazy-initialize  rather than be pre-instantiated    Given this  I initially chose BeanFactory for use in integration performance tests since I didn t want to load the entire application for testing isolated beans  However -- and somebody correct me if I m wrong -- BeanFactory doesn t support classpath XML configuration  So BeanFactory and ApplicationContext each provide a crucial feature I wanted  but neither did both   Near as I can tell  the note in the documentation about overriding default instantiation behavior takes place in the configuration  and it s per-bean  so I can t just set the  lazy-init  attribute in the XML file or I m stuck maintaining a version of it for test and one for deployment   What I ended up doing was extending ClassPathXmlApplicationContext to lazily load beans for use in tests like so   public class LazyLoadingXmlApplicationContext extends ClassPathXmlApplicationContext        public LazyLoadingXmlApplicationContext String   configLocations            super configLocations                         Upon loading bean definitions  force beans to be lazy-initialized          see org springframework context support AbstractXmlApplicationContext loadBeanDefinitions org springframework beans factory xml XmlBeanDefinitionReader                Override     protected void loadBeanDefinitions XmlBeanDefinitionReader reader  throws IOException           super loadBeanDefinitions reader           for  String name  reader getBeanFactory   getBeanDefinitionNames                  AbstractBeanDefinition beanDefinition    AbstractBeanDefinition  reader getBeanFactory   getBeanDefinition name               beanDefinition setLazyInit true

User · Answer

Feature Matrix of Bean Factory vs Application Context sourced from spring docs    Screenshot of features of BeanFacotry and ApplicationContext

User · Answer

Basically we can create spring container object in two ways   using BeanFactory  using ApplicationContext    both are the interfaces   using implementation classes we can create object for spring container  coming to the differences  BeanFactory     Does not support the Annotation based dependency Injection  Doesn t Support I18N  By default its support Lazy loading  it doesn t allow configure to multiple configuration files    ex   BeanFactory context new XmlBeanFactory new Resource  applicationContext xml      ApplicationContext   Support Annotation based dependency Injection - Autowired   PreDestroy Support I18N  Its By default support Aggresive loading  It allow to configure multiple configuration files    ex  ApplicationContext context new ClasspathXmlApplicationContext  applicationContext xml

User · Answer

To add onto what Miguel Ping answered  here is another section from the documentation that answers this as well      Short version  use an ApplicationContext unless you have a really good reason for not doing so  For those of you that are looking for slightly more depth as to the  but why  of the above recommendation  keep reading     posting this for any future Spring novices who might read this question

User · Answer

I think it s better to always use ApplicationContext  unless you re in a mobile environment like someone else said already  ApplicationContext has more functionality and you definitely want to use the PostProcessors such as RequiredAnnotationBeanPostProcessor  AutowiredAnnotationBeanPostProcessor and CommonAnnotationBeanPostProcessor  which will help you simplify your Spring configuration files  and you can use annotations such as  Required   PostConstruct   Resource  etc in your beans   Even if you don t use all the stuff ApplicationContext offers  it s better to use it anyway  and then later if you decide to use some resource stuff such as messages or post processors  or the other schema to add transactional advices and such  you will already have an ApplicationContext and won t need to change any code   If you re writing a standalone app  load the ApplicationContext in your main method  using a ClassPathXmlApplicationContext  and get the main bean and invoke its run    or whatever method  to start your app  If you re writing a web app  use the ContextLoaderListener in web xml so that it creates the ApplicationContext and you can later get it from the ServletContext  regardless of whether you re using JSP  JSF  JSTL  struts  Tapestry  etc   Also  remember you can use multiple Spring configuration files and you can either create the ApplicationContext by listing all the files in the constructor  or listing them in the context-param for the ContextLoaderListener   or you can just load a main config file which has import statements  You can import a Spring configuration file into another Spring configuration file by using  lt import resource  otherfile xml    gt  which is very useful when you programmatically create the ApplicationContext in the main method and load only one Spring config file

User · Answer

I think it s better to always use ApplicationContext  unless you re in a mobile environment like someone else said already  ApplicationContext has more functionality and you definitely want to use the PostProcessors such as RequiredAnnotationBeanPostProcessor  AutowiredAnnotationBeanPostProcessor and CommonAnnotationBeanPostProcessor  which will help you simplify your Spring configuration files  and you can use annotations such as  Required   PostConstruct   Resource  etc in your beans   Even if you don t use all the stuff ApplicationContext offers  it s better to use it anyway  and then later if you decide to use some resource stuff such as messages or post processors  or the other schema to add transactional advices and such  you will already have an ApplicationContext and won t need to change any code   If you re writing a standalone app  load the ApplicationContext in your main method  using a ClassPathXmlApplicationContext  and get the main bean and invoke its run    or whatever method  to start your app  If you re writing a web app  use the ContextLoaderListener in web xml so that it creates the ApplicationContext and you can later get it from the ServletContext  regardless of whether you re using JSP  JSF  JSTL  struts  Tapestry  etc   Also  remember you can use multiple Spring configuration files and you can either create the ApplicationContext by listing all the files in the constructor  or listing them in the context-param for the ContextLoaderListener   or you can just load a main config file which has import statements  You can import a Spring configuration file into another Spring configuration file by using  lt import resource  otherfile xml    gt  which is very useful when you programmatically create the ApplicationContext in the main method and load only one Spring config file

User · Answer

ApplicationContext is a big brother of BeanFactory and this would all thing that BeanFactory are provide plus many other things   In addition to standard org springframework beans factory BeanFactory lifecycle capabilities  ApplicationContext implementations detect and   invoke ApplicationContextAware beans as well as ResourceLoaderAware  ApplicationEventPublisherAware and MessageSourceAware beans

User · Answer

do use BeanFactory for non-web applications because it supports only Singleton and Prototype bean-scopes   While ApplicationContext container does support all the bean-scopes so you should use it for web applications

User · Answer

In summary   The ApplicationContext includes all functionality of the BeanFactory   It is generally recommended to use the former    There are some limited situations such as in a Mobile application  where memory consumption might be critical   In that scenarios  It can be justifiable to use the more lightweight BeanFactory  However  in the most enterprise applications  the ApplicationContext is what you will want to use   For more  see my blog post   Difference between BeanFactory and ApplicationContext in Spring     The java spring blog from the basics

User · Answer

In a real-time scenario  the difference between the Spring IOC Core container  BeanFactory  and Advanced J2EE container  ApplicationContext  are as follows    BeanFactory will create objects for the beans  i e   for POJO classes  mentioned in the spring xml file   lt bean gt  lt  bean gt   only when you call the  getBean   method  but whereas ApplicationContext creates the objects for all the beans   lt bean gt  lt  bean gt  if its scope is not explicitly mentioned as  Prototype   configured in the spring xml while loading the spring xml file itself  BeanFactory   Lazy container because it creates the objects for the beans only when you explicitly call from the user main class         Using core Container - Lazy container - Because it creates the bean objects On-Demand       creating a resource Resource r    Resource  new ClassPathResource  com spring resources spring xml      creating BeanFactory  BeanFactory factory new XmlBeanFactory r      Getting the bean for the POJO class  HelloWorld java  HelloWorld worldObj1    HelloWorld  factory getBean  test      ApplicationContext   Eager container because of creating the objects of all singleton beans while loading the spring xml file itself   ApplicationContext context   new ClassPathXmlApplicationContext  com ioc constructorDI resources spring xml     Technically  using ApplicationContext is recommended because in real-time applications  the bean objects will be created while the application is getting started in the server itself  This reduces the response time for the user request as the objects are already available to respond

User · Answer

The spring docs are great on this  3 8 1  BeanFactory or ApplicationContext   They have a table with a comparison  I ll post a snippet   Bean Factory   Bean instantiation wiring   Application Context   Bean instantiation wiring Automatic BeanPostProcessor registration Automatic BeanFactoryPostProcessor registration Convenient MessageSource access  for i18n  ApplicationEvent publication   So if you need any of the points presented on the Application Context side  you should use ApplicationContext

User · Answer

I need to explain the BeanFactory  amp  ApplicationContext      BeanFactory  BeanFactory is root interface for accessing the SpringBean Container There is basic client view of a bean container  That interface is implemented by the object class that holds the number of beans definitions  and each uniquely identify by the String name Depending the Bean definition the factory will return the instance that instance may be the instance of contained object or a single shared instance  Which type of instance will be return depends of bean factory configuration  Normally Bean factory will load the all the all the beans definition  which stored in the configuration source like XML   etc        BeanFactory is a simplest container providing the basic support for Dependency Injection  Application Context Application context is a central interface with in the spring application that provide the configuration information to the application  It implements the Bean Factory Interface       Application context is an advance container its add advance level of enterprise specific functionality such as ability to resolve the textual message from the property file    etc  An ApplicationContext provides   Bean factory methods for accessing application components  Inherited from ListableBeanFactory  The ability to load file resources in a generic fashion  Inherited from the ResourceLoader interface  The ability to publish events to registered listeners  Inherited from the ApplicationEventPublisher interface  The ability to resolve messages  supporting internationalization  Inherited from the MessageSource interface  Inheritance from a parent context  Definitions in a descendant context will always take priority  This means  for example  that a single parent context can be used by an entire web application  while each servlet has its own child context that is independent of that of any other servlet  In addition to standard BeanFactory lifecycle capabilities  ApplicationContext implementations detect and invoke ApplicationContextAware beans as well as ResourceLoaderAware  ApplicationEventPublisherAware and MessageSourceAware beans

User · Answer

a   One difference between bean factory and application context is that former only instantiate bean when you call getBean   method while ApplicationContext instantiates Singleton bean when the container is started  It doesn t wait for getBean to be called   b        ApplicationContext context   new ClassPathXmlApplicationContext  spring xml      or  ApplicationContext context   new ClassPathXmlApplicationContext  spring dao xml   spring service xml     You can use one or more xml file depending on your project requirement  As I am here using two xml files i e  one for configuration details for service classes other for dao classes  Here ClassPathXmlApplicationContext is child of ApplicationContext   c   BeanFactory Container is basic container  it can only create objects and inject Dependencies  But we can   t attach other services like security  transaction  messaging etc  to provide all the services we have to use ApplicationContext Container    d   BeanFactory doesn t provide support for internationalization i e  i18n but ApplicationContext provides support for it    e   BeanFactory Container doesn t support the feature of AutoScanning  Support Annotation based dependency Injection   but ApplicationContext Container supports    f   Beanfactory Container will not create a bean object until the request time  It means Beanfactory Container loads beans lazily  While ApplicationContext Container creates objects of Singleton bean at the time of loading only  It means there is early loading    g   Beanfactory Container support only two scopes  singleton  amp  prototype  of the beans  But ApplicationContext Container supports all the beans scope

User · Answer

Refer this doc from Spring Docs    http   static springsource org spring docs 3 2 x spring-framework-reference html beans html context-introduction-ctx-vs-beanfactory   5 15 1 BeanFactory or ApplicationContext   Use an ApplicationContext unless you have a good reason for not doing so   Because the ApplicationContext includes all functionality of the BeanFactory  it is generally recommended over the BeanFactory  except for a few situations such as in an Applet where memory consumption might be critical and a few extra kilobytes might make a difference  However  for most typical enterprise applications and systems  the ApplicationContext is what you will want to use  Spring 2 0 and later makes heavy use of the BeanPostProcessor extension point  to effect proxying and so on   If you use only a plain BeanFactory  a fair amount of support such as transactions and AOP will not take effect  at least not without some extra steps on your part  This situation could be confusing because nothing is actually wrong with the configuration

User · Answer

To me  the primary difference to choose BeanFactory over ApplicationContext seems to be that ApplicationContext will pre-instantiate all of the beans  From the Spring docs      Spring sets properties and resolves dependencies as late as possible  when the bean is actually created  This means that a Spring container which has loaded correctly can later generate an exception when you request an object if there is a problem creating that object or one of its dependencies  For example  the bean throws an exception as a result of a missing or invalid property  This potentially delayed visibility of some configuration issues is why ApplicationContext implementations by default pre-instantiate singleton beans  At the cost of some upfront time and memory to create these beans before they are actually needed  you discover configuration issues when the ApplicationContext is created  not later  You can still override this default behavior so that singleton beans will lazy-initialize  rather than be pre-instantiated    Given this  I initially chose BeanFactory for use in integration performance tests since I didn t want to load the entire application for testing isolated beans  However -- and somebody correct me if I m wrong -- BeanFactory doesn t support classpath XML configuration  So BeanFactory and ApplicationContext each provide a crucial feature I wanted  but neither did both   Near as I can tell  the note in the documentation about overriding default instantiation behavior takes place in the configuration  and it s per-bean  so I can t just set the  lazy-init  attribute in the XML file or I m stuck maintaining a version of it for test and one for deployment   What I ended up doing was extending ClassPathXmlApplicationContext to lazily load beans for use in tests like so   public class LazyLoadingXmlApplicationContext extends ClassPathXmlApplicationContext        public LazyLoadingXmlApplicationContext String   configLocations            super configLocations                         Upon loading bean definitions  force beans to be lazy-initialized          see org springframework context support AbstractXmlApplicationContext loadBeanDefinitions org springframework beans factory xml XmlBeanDefinitionReader                Override     protected void loadBeanDefinitions XmlBeanDefinitionReader reader  throws IOException           super loadBeanDefinitions reader           for  String name  reader getBeanFactory   getBeanDefinitionNames                  AbstractBeanDefinition beanDefinition    AbstractBeanDefinition  reader getBeanFactory   getBeanDefinition name               beanDefinition setLazyInit true

User · Answer

For the most part  ApplicationContext is preferred unless you need to save resources  like on a mobile application   I m not sure about depending on XML format  but I m pretty sure the most common implementations of ApplicationContext are the XML ones such as ClassPathXmlApplicationContext  XmlWebApplicationContext  and FileSystemXmlApplicationContext   Those are the only three I ve ever used   If your developing a web app  it s safe to say you ll need to use XmlWebApplicationContext   If you want your beans to be aware of Spring  you can have them implement BeanFactoryAware and or ApplicationContextAware for that  so you can use either BeanFactory or ApplicationContext and choose which interface to implement

User · Answer

do use BeanFactory for non-web applications because it supports only Singleton and Prototype bean-scopes   While ApplicationContext container does support all the bean-scopes so you should use it for web applications

User · Answer

To add onto what Miguel Ping answered  here is another section from the documentation that answers this as well      Short version  use an ApplicationContext unless you have a really good reason for not doing so  For those of you that are looking for slightly more depth as to the  but why  of the above recommendation  keep reading     posting this for any future Spring novices who might read this question

User · Answer

ApplicationContext  It loads spring beans configured in spring configuration file and manages the life cycle of the spring bean as and WHEN CONTAINER STARTS It won t wait until getBean  springbeanref   is called   BeanFactory  It loads spring beans configured in spring configuration file manages the life cycle of the spring bean when we call the getBean  springbeanref   So when we call the getBean  springbeanref   at the time of spring bean life cycle starts

User · Answer

Difference between BeanFactory and ApplicationContext are following    BeanFactory uses lazy initialization but ApplicationContext uses eager initialization  In case of BeanFactory  bean is created when you call getBeans   method  but bean is created upfront in case of ApplicationContext when the ApplicationContext object is created  BeanFactory explicitly provide a resource object using syntax but ApplicationContext creates and manages resource objects on its own  BeanFactory doesnt support internatiolization but ApplicationContext supports internationalization  With BeanFactory annotation based dependency injection is not supported but annotation based dependency injection is supported in ApplicationContext    Using BeanFactory   BeanFactory beanfactory   new XMLBeanFactory new FileSystemResource  spring xml      Triangle triangle   Triangle beanFactory getBean  triangle      Using ApplicationContext   ApplicationContext context   new ClassPathXMLApplicationContext  spring xml   Triangle triangle   Triangle context getBean  triangle

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I think it s better to always use ApplicationContext  unless you re in a mobile environment like someone else said already  ApplicationContext has more functionality and you definitely want to use the PostProcessors such as RequiredAnnotationBeanPostProcessor  AutowiredAnnotationBeanPostProcessor and CommonAnnotationBeanPostProcessor  which will help you simplify your Spring configuration files  and you can use annotations such as  Required   PostConstruct   Resource  etc in your beans   Even if you don t use all the stuff ApplicationContext offers  it s better to use it anyway  and then later if you decide to use some resource stuff such as messages or post processors  or the other schema to add transactional advices and such  you will already have an ApplicationContext and won t need to change any code   If you re writing a standalone app  load the ApplicationContext in your main method  using a ClassPathXmlApplicationContext  and get the main bean and invoke its run    or whatever method  to start your app  If you re writing a web app  use the ContextLoaderListener in web xml so that it creates the ApplicationContext and you can later get it from the ServletContext  regardless of whether you re using JSP  JSF  JSTL  struts  Tapestry  etc   Also  remember you can use multiple Spring configuration files and you can either create the ApplicationContext by listing all the files in the constructor  or listing them in the context-param for the ContextLoaderListener   or you can just load a main config file which has import statements  You can import a Spring configuration file into another Spring configuration file by using  lt import resource  otherfile xml    gt  which is very useful when you programmatically create the ApplicationContext in the main method and load only one Spring config file

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The spring docs are great on this  3 8 1  BeanFactory or ApplicationContext   They have a table with a comparison  I ll post a snippet   Bean Factory   Bean instantiation wiring   Application Context   Bean instantiation wiring Automatic BeanPostProcessor registration Automatic BeanFactoryPostProcessor registration Convenient MessageSource access  for i18n  ApplicationEvent publication   So if you need any of the points presented on the Application Context side  you should use ApplicationContext

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In summary   The ApplicationContext includes all functionality of the BeanFactory   It is generally recommended to use the former    There are some limited situations such as in a Mobile application  where memory consumption might be critical   In that scenarios  It can be justifiable to use the more lightweight BeanFactory  However  in the most enterprise applications  the ApplicationContext is what you will want to use   For more  see my blog post   Difference between BeanFactory and ApplicationContext in Spring     The java spring blog from the basics

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Basically we can create spring container object in two ways   using BeanFactory  using ApplicationContext    both are the interfaces   using implementation classes we can create object for spring container  coming to the differences  BeanFactory     Does not support the Annotation based dependency Injection  Doesn t Support I18N  By default its support Lazy loading  it doesn t allow configure to multiple configuration files    ex   BeanFactory context new XmlBeanFactory new Resource  applicationContext xml      ApplicationContext   Support Annotation based dependency Injection - Autowired   PreDestroy Support I18N  Its By default support Aggresive loading  It allow to configure multiple configuration files    ex  ApplicationContext context new ClasspathXmlApplicationContext  applicationContext xml

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For the most part  ApplicationContext is preferred unless you need to save resources  like on a mobile application   I m not sure about depending on XML format  but I m pretty sure the most common implementations of ApplicationContext are the XML ones such as ClassPathXmlApplicationContext  XmlWebApplicationContext  and FileSystemXmlApplicationContext   Those are the only three I ve ever used   If your developing a web app  it s safe to say you ll need to use XmlWebApplicationContext   If you want your beans to be aware of Spring  you can have them implement BeanFactoryAware and or ApplicationContextAware for that  so you can use either BeanFactory or ApplicationContext and choose which interface to implement

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I think it s better to always use ApplicationContext  unless you re in a mobile environment like someone else said already  ApplicationContext has more functionality and you definitely want to use the PostProcessors such as RequiredAnnotationBeanPostProcessor  AutowiredAnnotationBeanPostProcessor and CommonAnnotationBeanPostProcessor  which will help you simplify your Spring configuration files  and you can use annotations such as  Required   PostConstruct   Resource  etc in your beans   Even if you don t use all the stuff ApplicationContext offers  it s better to use it anyway  and then later if you decide to use some resource stuff such as messages or post processors  or the other schema to add transactional advices and such  you will already have an ApplicationContext and won t need to change any code   If you re writing a standalone app  load the ApplicationContext in your main method  using a ClassPathXmlApplicationContext  and get the main bean and invoke its run    or whatever method  to start your app  If you re writing a web app  use the ContextLoaderListener in web xml so that it creates the ApplicationContext and you can later get it from the ServletContext  regardless of whether you re using JSP  JSF  JSTL  struts  Tapestry  etc   Also  remember you can use multiple Spring configuration files and you can either create the ApplicationContext by listing all the files in the constructor  or listing them in the context-param for the ContextLoaderListener   or you can just load a main config file which has import statements  You can import a Spring configuration file into another Spring configuration file by using  lt import resource  otherfile xml    gt  which is very useful when you programmatically create the ApplicationContext in the main method and load only one Spring config file

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BeanFactory and ApplicationContext both are ways to get beans from your spring IOC container but still there are some difference   BeanFactory is the actual container which instantiates  configures  and manages a number of bean s  These beans  are typically collaborate with one another  and thus have dependencies between themselves  These dependencies are reflected in the configuration data used by the BeanFactory   BeanFactory and ApplicationContext both are Java interfaces and ApplicationContext extends BeanFactory  Both of them are configuration using XML configuration files  In short BeanFactory provides basic Inversion of control IoC  and Dependency Injection  DI  features while ApplicationContext provides advanced features   A BeanFactory is represented by the interface  org springframework beans factory  Where BeanFactory  for which there are multiple implementations   ClassPathResource resource   new ClassPathResource  appConfig xml    XmlBeanFactory factory   new XmlBeanFactory resource     DIFFERENCE   BeanFactory instantiate bean when you call getBean   method while ApplicationContext instantiate Singleton bean when container is started   It doesn t wait for getBean   to be called  BeanFactory doesn t provide support for internationalization but ApplicationContext provides support for it  Another difference between BeanFactory vs ApplicationContext is ability to publish event to beans that are registered as listener  One of the popular implementation of BeanFactory interface is XMLBeanFactory while one of the popular implementation of ApplicationContext interface is ClassPathXmlApplicationContext  If you are using auto wiring and using BeanFactory than you need to register AutoWiredBeanPostProcessor using API which you can configure in XML if you are using  ApplicationContext  In summary BeanFactory is OK for testing and non production use but ApplicationContext is more feature rich container implementation and should be favored over BeanFactory BeanFactory by default its support Lazy loading and ApplicationContext by default support Aggresive loading

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Refer this doc from Spring Docs    http   static springsource org spring docs 3 2 x spring-framework-reference html beans html context-introduction-ctx-vs-beanfactory   5 15 1 BeanFactory or ApplicationContext   Use an ApplicationContext unless you have a good reason for not doing so   Because the ApplicationContext includes all functionality of the BeanFactory  it is generally recommended over the BeanFactory  except for a few situations such as in an Applet where memory consumption might be critical and a few extra kilobytes might make a difference  However  for most typical enterprise applications and systems  the ApplicationContext is what you will want to use  Spring 2 0 and later makes heavy use of the BeanPostProcessor extension point  to effect proxying and so on   If you use only a plain BeanFactory  a fair amount of support such as transactions and AOP will not take effect  at least not without some extra steps on your part  This situation could be confusing because nothing is actually wrong with the configuration

[spring] BeanFactory vs ApplicationContext

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