Cognizant Java Technical Lead Interview Questions, Process, and Tips

Controller Advice is a mechanism in Spring MVC to handle exceptions globally.

• It is used to handle exceptions across multiple controllers.

• It can be used to add common data to the model.

• It can be used to customize the response status code and message.

• It can be used to redirect to a custom error page.

2 way SSL is needed for mutual authentication between client and server.

• 2 way SSL ensures that both client and server are authenticated

• It provides an extra layer of security by verifying the identity of both parties

• It is commonly used in financial transactions, healthcare, and government applications

Decorator pattern adds behavior to an object dynamically without affecting its existing behavior.

• It is a structural pattern

• It involves a component interface, concrete component, decorator interface, and concrete decorator

• Decorators wrap around components to add new behavior

• It allows for flexible and dynamic behavior modification

• Example: Java I/O streams use decorator pattern

Grouping by in streams in Java

• Use the 'groupingBy' method from the 'Collectors' class

• Pass a lambda expression to specify the grouping criteria

• The result is a Map with the grouping criteria as keys and the grouped elements as values