1. Introduction
In this article, We'll be learning how to create a singleton bean in Spring Boot and Spring applications. Once a bean is declared as singleton then spring container will create exactly only one instance for that bean. But, We can make bean scope as singleton as a result container will create only once instance as similar to the Singleton Desing Pattern.
By Default, A bean in spring is treated as singleton scoped. But, This can be changed to prototype as well with <bean> tag attribute and @Scope annotation.
2. Singleton With @Scope Annotation
First of all, we will see now how to create and next, how to make bean as a singleton with @Scope annotation. @Scope Annotation has attribute value that takes the value as ConfigurableBeanFactory.SCOPE_SINGLETON or ConfigurableBeanFactory.SCOPE_PROTOTYPE
Another this is we already discussed in the previous article, Bean creation with @Bean annotation.