NOTE: The behaviors in this article are for HotSpot, other JVM might behave differently. What is JVM? The Java Virtual Machine is the cornerstone of the Java platform. It is the component of the technology responsible for its hardware- and operating system independence, the small size of its compiled code, and its ability to protect users from malicious programs. The Java Virtual Machine is an abstract computing machine. Like a real computing machine, it has an instruction set and manipulates various memory areas at run time.
Today, the Spring Framework was released to 4.2 RC2. In Spring 4.2, better application events and Server-Sent Event(SSE) are supported. In this article, I’ll introduce you to the two new features. What’s Server-Sent Event Server-sent events (SSE) is a technology where a browser receives automatic updates from a server via an HTTP connection. The Server-Sent Events EventSource API is standardized as part of HTML5 by the W3C. Server-sent event is a standard describing how servers can initiate data transmission toward clients once an initial client connection has been established.
This guide walks you through the process of creating a “hello world” application that sends messages back and forth, between a browser and the server. WebSocket is a very thin, lightweight layer above TCP. It makes it very suitable to use “subprotocols” to embed messages. In this guide, we’ll dive in and use STOMP messaging with Spring to create an interactive web application. Maven Dependencies First, we need to add the Spring messaging modules in the POM file:
Last few months, I’m working on a project with Spring MVC and Hibernate. Now, I want to try MyBatis. In this article, I’ll tell you how to useMyBatis with Spring MVC. According to Wikipedia, database transactions should provide an “all-or-nothing” proposition, stating that each work-unit performed in a database must either be completed in its entirety or have no effect whatsoever. Further, the system must isolate each transaction from other transactions, results must conform to existing constraints in the database, and transactions that complete successfully must get written to durable storage.
Introduction Verwandlung Online Judge is a cross-platform online judge system based on the Spring MVC Framework. The application used the following components: Spring MVC Framework Druid Database Connection Pool CodeMirror Editor ActiveMQ The architecture of the project can be described as follows: Code Repository Screenshots
This tutorial provides a sample spring MVC application that allows user sending an e-mail message. In this tutorial, you are supposed to familiar with Java EE development as well as developing Spring MVC-based applications. Spring Framework’s Support for E-mail Based on JavaMail, Spring framework provides high-level abstraction API which greatly simplifies e-mail sending process. Let’s take a brief look at this API in the following class diagram: To send e-mail messages, we can use an implementation of interface MailSender – the JavaMailSenderImpl class which is built upon on JavaMail.
Almost all collections in Java are derived from the java.util.Collection interface. Collection defines the basic parts of all collections. The interface states the add() and remove() methods for adding to and removing from a collection respectively. Also required is the toArray() method, which converts the collection into a simple array of all the elements in the collection. Finally, the contains() method checks if a specified element is in the collection. The Collection interface is a subinterface of java.