What Causes a Spring NoSuchBeanDefinitionException, and How Can I Resolve It?

What is a NoSuchBeanDefinitionException and how do I fix it?

A NoSuchBeanDefinitionException is thrown when Spring cannot find a bean definition for a given bean name or type. This can occur for a number of reasons, such as:

• The bean is not registered in the BeanFactory.
• The bean name is misspelled.
• The bean class is not available on the classpath.
• The bean class is not annotated with the @Component annotation or its equivalent.

To fix this exception, you should make sure that the bean is properly registered in the BeanFactory, that the bean name is correct, and that the bean class is available on the classpath. You should also make sure that the bean class is annotated with the @Component annotation or its equivalent.

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