2 What are some essential elements of Hibernate Architecture?
The following are the essential elements of Hibernate Architecture:
The session objects are kept in the session factory. It includes the secondary data cache ( optional). The org.hibernate is used. A factory method to retrieve the session object is provided by the SessionFactory interface.
The session object serves as a conduit between the database and the application. It offers the application an interface to access the databases stored data.
The JDBC connection is contained within the session object, which has a limited lifespan. It serves as a factory for the many session components, including query, transaction, and criterion. It houses the primary data cache (mandatory). The hibernate.org. The session interface offers ways to add, update, and remove the object. The factory methods for Transaction, Query, and Criteria are also included.
The atomic component of the tasks is contained in the transaction objects. Its a choice-based component. Methods for managing transactions are provided via the org.hibernate.Transaction interface.
JDBC connections are provided via the ConnectionProvider. It is a choice-based component. It removes the applications dependence on “DriverManager” or “DataSource.”
The element TransactionFactory is optional. The transaction objects are kept there.
1 What are the gains (advantages) of using Spring Framework in Java?
For creating enterprise Java applications, Spring is a potent Java framework. Some major advantages of adopting the Spring framework include the following:
State the main difference between Abstract Class and Interface in Java?
Interface and Abstract Class are fundamentally different from one another in that the former only permits the definition of public static methods. It does not contain any application of the aforementioned approaches.
Contrarily, abstract classes are open to any access specifier, whether or not it has a class implementation. Another distinction is that a class that implements an interface must also implement all the interfaces methods. On the other hand, this is not necessary for Abstract Class.
2 How can one do database migration?
Two technologies that aid in managing, tracking, and deploying database schema changes are Liquibase and Flyway. They are both migration-based technologies that, by considering database code like app code and automating it, seek to close a gap in many teams workflows.
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How is exception handling performed in the Spring MVC Framework?
The following methods are available in Spring MVC to configure exception handling in our program:
Controller-based: Here, we define techniques for handling exceptions. All that is required is to annotate these methods with @ExceptionHandler.
The @ControllerAdvice annotation is used as a global exception handler. The definition of the global exception handler can be done using any class.
Implementation of the HandlerExceptionResolver: To develop global exception handlers, Spring MVC offers HandlerExceptionResolver. This approach was chosen since the Spring framework also provides a few default classes that may be included in our spring bean configuration file to gain the advantages of exception handling.
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