In Spring framework, we mainly use SpEL as annotation in a bean. But SpEL has other use cases as well.
Like evaluating the expression on the fly. e.g. You can store expression in database & execute on demand.
More documentation can be found on:
https://docs.spring.io/spring-framework/docs/3.0.x/reference/expressions.html
https://docs.spring.io/spring-framework/reference/core/expressions.html
https://dzone.com/articles/learn-spring-expression-language-with-examples
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