What is a factory bean in Spring?

A FactoryBean is a pattern to encapsulate interesting object construction logic in a class. A FactoryBean is also useful to help Spring construct objects that it couldn’t easily construct itself.

What is factory method Spring?

Spring framework provides facility to inject bean using factory method. factory-method: represents the factory method that will be invoked to inject the bean. factory-bean: represents the reference of the bean by which factory method will be invoked. It is used if factory method is non-static.

What is the use of bean factory in Spring?

The BeanFactory. The BeanFactory is the actual container which instantiates, configures, and manages a number of beans. These beans typically collaborate with one another, and thus have dependencies between themselves.

How do you make a bean factory in Spring?

The first step is to create a factory object where we used the framework APIXmlBeanFactory() to create the factory bean andClassPathResource() API to load the bean configuration file available in CLASSPATH.
The second step is used to get the required bean using getBean() method of the created bean factory object.

Is Spring beans are thread safe?

Spring singleton beans are NOT thread-safe just because Spring instantiates them. Sorry. Spring just manage the life cycle of singleton bean and maintains single instance of object. Thread safety has nothing to do with it.

Does spring use factory pattern?

Spring uses this technique at the root of its Dependency Injection (DI) framework. Fundamentally, Spring treats a bean container as a factory that produces beans.

Is Spring a factory pattern?

As the name suggests, the factory method pattern makes use of classes that acts as factories to create objects. This pattern favors method invocation instead of making direct constructor calls to create objects. A factory method in the interface defers the object creation to one or more concrete subclasses at run time.

Does Spring use factory pattern?

What does bean factory do?

The BeanFactory holds Bean Definitions of multiple beans within itself and then instantiates the bean whenever asked for by clients. BeanFactory also takes part in the life cycle of a bean, making calls to custom initialization and destruction methods.

What is the default scope of Spring bean?

singleton
Spring’s default scope is singleton. It’s just that your idea of what it means to be a singleton doesn’t match how Spring defines singletons. If you tell Spring to make two separate beans with different ids and the same class, then you get two separate beans, each with singleton scope.

Which does early initialization of beans?

By default, Spring “application context” eagerly creates and initializes all ‘singleton scoped’ beans during application startup itself. It helps in detecting the bean configuration issues at early stage, in most of the cases.

Are Singleton beans thread safe in spring?

Singleton spring beans has no relation with thread safety. spring container only manages life-cycle of objects and guaranteed that only one object in spring container. so If an Non thread safe object is injected then obviously it is not thread safe. To make it thread safe you have to handle it by coding.

Can you create a factory Bean in spring?

In Spring you can also Create and Configure of Spring Bean using Spring’s FactoryBean . A factory bean in Spring serves as a factory for creating other beans within the Spring IoC container. In Java terms we can say that, a factory bean is very similar to a factory method…

What does a factory Bean do in Java?

A factory bean in Spring serves as a factory for creating other beans within the Spring IoC container. In Java terms we can say that, a factory bean is very similar to a factory method (Java Factory Pattern), but here it is Spring specific bean which can be identified by the Spring IoC container during bean construction.

How to create a factory method in spring?

Instance Factory Method A standard implementation of the factory method pattern is to create an instance method that returns the desired bean. Additionally, we can configure Spring to create our desired bean with or without arguments. 2.1. Without Arguments We can create a Foo class that represents our bean being created:

How to use the spring factorybean with XML based configuration?

Now, let’s implement an example FactoryBean. We’ll implement a ToolFactory which produces objects of the type Tool: As we can see, the ToolFactory is a FactoryBean, which can produce Tool objects. 2.2. Use FactoryBean With XML-based Configuration

What is a factory bean in Spring? A FactoryBean is a pattern to encapsulate interesting object construction logic in a class. A FactoryBean is also useful to help Spring construct objects that it couldn’t easily construct itself. What is factory method Spring? Spring framework provides facility to inject bean using factory method. factory-method: represents the…