* Define beans for handling different message types in a lean chat app
* Add class based spring beans configuration
* Define spring configuration in XML for constructor based bean injection
* Refactor package structure to separate constructor based bean injection code set from setter based bean injection code set
* Define configuration and classes specific to setter-based bean injection.
* Implement tests for constructor-based and setter-based bean injections
* develop codes for explaining type erasure
* Write unit tests for type erasure examples
* Remove evaluation article code
* Modify type erasure examples and unit tests
* Modify type erasure examples and unit tests
* Add expected exception in TypeErasureUnitTest
* Correct grammar in class name
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