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. 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. 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. But still BeanFactory exists for backward compatability. 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. I think it's better to always use ApplicationContext, unless you're in a mobile environment like someone else said already. 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. 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.
Difference between BeanFactory and ApplicationContext are following:. For the most part, ApplicationContext is preferred unless you need to save resources, like on a mobile application. Those are the only three I've ever used. 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. Both of them are configuration using XML configuration files.
A BeanFactory is represented by the interface " org. 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. 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.
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.
You can use one or more xml file depending on your project requirement. As I am here using two xml files i.
BeanFactory Container is basic container, it can only create objects and inject Dependencies. BeanFactory doesn't provide support for internationalization i. 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. But ApplicationContext Container supports all the beans scope. 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. Setter vs Constructor Injection and What is the default scope of Spring bean. Before seeing the difference between ApplicationContext and BeanFactory, let see some similarity between both of them.
Both of them are configuration using XML configuration files , now application context also allows Java configuration. Apart from these, here are a few more differences between BeanFactory and ApplicationContext which is mostly based upon features supported by them. Internationalization i18n. BeanFactory doesn't provide support for internationalization i.
Event Publishing. Another difference between BeanFactory vs ApplicationContext is the ability to publish events to beans that are registered as listeners.
For example, a ContextStartedEvent is published when the context is started and ContextStoppedEvent is published when the context is stopped. Event handling in the ApplicationContext is provided through the ApplicationEvent class and ApplicationListener interface.
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. And, if you want to learn more then you can further see a comprehensive Spring course like Spring MasterClass from Beginner to Expert to understand more about the basic Spring concepts.
The proceeding figure shows the console output. Summary The BeanFactory is usually preferred where the resources are limited like mobile devices or applet-based applications.
Share 0. The RequestBody Annotation. You May Also Like. By jt Java , Lombok , Spring. By jt Docker , Spring Boot.
By jt Java , Spring. By jt Spring Boot. By jt Spring Framework 5. By Daniel Wagner Spring Boot. By jt Spring Cloud Contract. By jt Spring Cloud Contract , Uncategorized. By jt Spring Data. By jt Spring , Spring Boot. By jt Spring , Spring Core. This open design can be seen everywhere in spring. For example, in Benefit, an empty function is provided to implement postProcessBeanFactory to facilitate programmers to further expand their business.
This is just registration. The real call is at getBean time. Next we will explain each process in detail. ApplicationContext adds a lot of basic applications to it. ObtainFreshBeanFactory formally implements the beanFactory. After this function, the ApplicationFactory has all the functions of BeanFactory. Let's look at the code for this method:.
Further into the refreshBeanFactory method, the implementation of the method is in the AbstractRefreshable Application Context:.
We follow up with loadBe. In the body of an Definitions bean Factory method, we see that it is implemented in AbstractXml Application Context with the following code:. Continue to the body of the loadBean Definitions beanDefinitionReader method with the following code:. Includes all parsed configurations.
Next, we will analyze the next function in detail and enter the method body. After a detailed analysis of the code, it is found that the above functions are mainly extended in the following ways: 1 Support for SPEL Language 2 Increase support for attribute editors 3 Increase support for some built-in classes, such as EnvironmentAware, MessageSourceAware injection 4 The interface with negligible dependency function is set up.
SpEL is a separate module, relying only on core module, not on other modules, and can be used separately. The above is just the simplest way to use it. SpEL is very powerful and can greatly improve the efficiency of development.
In the source code, SpEL can be parsed by registering the language parser through the code beanFactory. Where will the parser be called after that?
Previously, beanFactory said that Spring has a property filling step when the bean is initialized, and in this step Spring calls the applyPropertyValues of the AbstractAutowire CapabelBeanFactory class to parse the property. The method code is as follows:. BeanFactory serves as the basis of container function in spring to store all loaded bean s. As an example, Spring has made a lot of extensions to BeanFactory, such as PostProcessor, which we are familiar with.
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