Does spring allow multiple bean definitions of the same class?
Yes, you can with the help of your custom implementation of BeanFactoryPostProcessor. Here is a simple example. Suppose we have two components. One is dependency for another.
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How can we make Singleton bean thread safe in spring?
Singleton spring beans have nothing to do with thread safety. The spring container only manages the lifecycle of objects and guarantees that only one object in the spring container. therefore, if a non-thread-safe object is injected, it is obviously not thread-safe. To make it thread safe, you need to handle it by coding.
How to load multiple Spring Bean configuration files?
It is standard practice to split the configuration file into several small configuration files based on functionality. This page helps you understand how to handle multiple Spring Bean configuration files, we can achieve this using the tag.
When do we get the same bean instance every time?
Every time we call getbean, we get the same bean instance from the application context. When the application initialized the JVM, it read all the configuration from the XML file or configuration class and loaded beans into the application context with a default bean scope singleton.
How to test a singleton spring bean class?
Practice creating a singleton bean class. This bean is a regular spring bean. For testing purposes, we add the static instances created counter to test the number of times the constructor is called. This way we could know when a new instance of the bean is created.
What is the default bean scope in spring?
As we know, the default scope of the bean is a singleton. Every time we call getbean, we get the same bean instance from the application context. When the application initialized the JVM, it read all the configuration from the XML file or configuration class and loaded beans into the application context with a default bean scope singleton.