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  The property spring.jpa.open-in-view in Spring Boot configures the Open Session in View (OSIV) pattern for managing database sessions in a Spring application that uses Spring Data JPA. By default, when using JPA in Spring, each database transaction has a separate session that is created and closed automatically. This means that when you retrieve an entity from the database within a transaction, the session is closed once the transaction completes, and any subsequent access to lazily loaded properties of that entity will result in a LazyInitializationException. The Open Session in View pattern is a solution to this problem. It allows the session to remain open beyond the transaction boundary, effectively keeping the session open until the view rendering is complete. This way, when accessing lazily loaded properties of an entity in the view layer (such as in a web page), the session is still available, and the properties can be accessed without exceptions. Setting spring.jpa.open-in-v

  Spring Boot provides a convenient way to manage external configuration through properties files. By default, Spring Boot uses the application.properties file to load the configuration. However, you can also use multiple external configuration files to separate different configuration concerns. To use multiple external configuration files in Spring Boot, you can follow these steps: Create separate properties files for each configuration concern. For example, you might have database.properties , email.properties , and logging.properties . Place these properties files in a location where Spring Boot can find them. By default, Spring Boot searches for properties files in the following locations (in the listed order): T he config folder in the current directory. The cur rent directory. A c lasspath /config package. The classp ath root. You can also specify custom locations using the spring.config.location property (e.g., spring.config.location=classpath:/custom-config/ ). In each prop

  To configure a port for a Spring Boot application, you can follow these steps: Open the application.properties or application.yml file in your Spring Boot project. This file is typically located in the src/main/resources directory. If you are using the application.properties file, add the following line to specify the port number: server.port=8080 Replace 8080 with the desired port number. If you are using the application.yml file, add the following lines: server: port: 8080 Again, replace 8080 with the desired port number. Save the changes to the file. Alternatively, you can configure the port programmatically by creating a configuration class in your project. For example, create a class named ServerPortConfig : import org.springframework.boot.web.server.ConfigurableWebServerFactory; import org.springframework.boot.web.server.WebServerFactoryCustomizer; import org.springframework.boot.web.servlet.server.ConfigurableServletWebServerFactory; import org.springframework.s