![]() If a record has been modified by another transaction, your transaction’s version field will be out of date, and a will be thrown. The column is how Hibernate performs optimistic locking.This means it must have a constructor that has no arguments. The class must have a default (or undefined) constructor method.The class must be annotated with The class must have a column.In order to map an object, a few things always need to be done: The id field is a required field, but before you complain, there is a philosophy of database design that dictates every entity table should have its own id column some disagree with this, but I’ve found it a very convenient practice. ![]() Notice that this is a simple POJO with two fields: id and version. Public static EntityManagerFactory getEntityManagerFactory()ĮntityManagerFactory emf = Persistence.createEntityManagerFactory("hsqldb-ds") įortunately for us, Hibernate comes with a default logging configuration that shows us pretty much what we need, and if you are using it on a Java EE Application Server like JBoss AS or GlassFish then this logging is configured in the server itself however, if you want to customize the log output for our standalone Java SE demo, you’ll need to take a look at jboss-logging. You should note that we are also using the class to obtain an EntityManagerFactory The EntityManagerFactory controls connections to the database, and also gives you access to EntityManager instances.ĮntityManager is the API you’ll be using to actually interact with the database via SQL or JQL (JPA Query Language.) Absolutely no requirement for XML .ĮntityManagerUtil is a convenience class that provides your application access to the active EntityManagerFactory.Provide production-ready features such as metrics, health checks, and externalized configuration.It has embedded tomcat, jetty which makes it just code and run the application.Creates stand-alone spring application with minimal configuration needed.Features of Spring Boot that make it different? ![]() It has extra support of auto-configuration and embedded application server like tomcat, jetty, etc. Sprint boot is a Java-based spring framework used for Rapid Application Development (to build stand-alone microservices). The article will walk you through the Spring Boot interview questions for basic to advanced level. Because of its fast, low configuration, inbuild server, and monitoring features, it helps to build a stand-alone java application from scratch with very robust and maintainable. Spring boot is the hottest topic of discussion in interviews if it comes to Java Application development. Where do we define properties in the Spring Boot application? How to enable debugging log in the spring boot application? How to check the environment properties in your Spring boot application? How to get the list of all the beans in your Spring boot application? What are the actuator-provided endpoints used for monitoring the Spring boot application? How to enable Actuator in Spring boot application? What is Spring Actuator? What are its advantages? What is the use of Profiles in spring boot? What is the difference between RequestMapping and GetMapping? Describe the flow of HTTPS requests through the Spring Boot application? ![]() What is the difference between and in Spring Boot? How to disable a specific auto-configuration class? Can we disable the default web server in the Spring boot application? ![]() Can we override or replace the Embedded tomcat server in Spring Boot? What is the default port of tomcat in spring boot? Is it possible to change the port of the embedded Tomcat server in Spring Boot? Can we create a non-web application in Spring Boot? What is Spring Boot dependency management? What Are the Basic Annotations that Spring Boot Offers? What are the most common Spring Boot CLI commands? What is Spring Boot CLI and what are its benefits? How does a spring boot application get started? What is the purpose of using in the class files? What is the starter dependency of the Spring boot module? What are the advantages of using Spring Boot?
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