In this class, which uses the Spring annotation to indicate to the framework that it is a resource configuration class, we set the Jersey, which is our ResourceManager responsible for exposing REST services for the consumers. ![]() The next class we will see is the ApplicationConfig. The first class that we create, that we call Application, will be identical in all three projects, because it only works as an initiator to Spring Boot - as defined by annotation - rising a Spring context and the embedded server: With the dependencies established, we start coding. In the poms of the 3 projects, we will add the dependencies for the creation of our REST services and startup Spring Boot, as we can see below. To begin, let's create 3 simple Maven projects without defined archetype, and let's call them Product-backend, Customer-backend and Order-backend. To illustrate the concept of microservices, we will create 3 Maven projects in this hands-on: each of them will symbolize back-end functionality, ie reusable APIs, and one of them held a composition, that is, will be a consumer of the other 2. For this lab, we will use the Eclipse Luna and Maven 3. So without further delay, let's begin our hands-on. With Spring Boot, we can expose components such as REST services independently, exactly as proposed in microservices architecture, so that in any maintenance of the components, we no longer make the redeploy of all the system. In this architectural model, rather than package the jar files into consumer systems, the components are independently exposed in the form of remote accessible APIs, consumed using protocols such as HTTP, for example.Īn important point to note in the above explanations, is that although we are exemplifying the model using the Java world, the same principles can be applied to other technologies such as C #.Īmong the new features in version 4.0 of the Spring Framework, a new project that has arisen is the Spring Boot.O goal of Spring Boot is to provide a way to provide Java applications quickly and simply, through an embedded server - by default it uses an embedded version of tomcat - thus eliminating the need of Java EE containers. In order to propose a solution to this issue, was born microservices architecture model. In this scenario, we have a considerable operational maintenance work, since as well as the correction on the component, we would have to make the redeploy of all consumer applications due to the component to be packaged inside the other deployment packages. ![]() Imagine now that a problem in the customer register is found. In the traditional form of Java implementation, we would package this jar in several other packages, such as EAR files, WAR, etc. In this scenario, we could have several interfaces to use this component, such as web applications, mobile, EJBs, etc. Imagine, for example, a component that implements a register of customers and we package this component in a java project, which generates his deliverable as a. In these scenarios, several components are reused by different interfaces and / or systems. In the development of large systems, it is common to develop various components and libraries that implement various functions, ranging from the implementation of business requirements to technical tasks, such as an XML parser, for example. In this article, we will talk about an interesting architectural model, microservices architecture, in addition to studying one of the new features of Spring 4.0, Spring Boot. Once is configured, you can start annotating your code to indicate that Spring should automatically wire values into properties, methods, and constructors.Welcome, reader. ![]() So consider the following configuration file in case you want to use any annotation in your Spring application. So, before we can use annotation-based wiring, we will need to enable it in our Spring configuration file. Thus, the latter configuration will override the former for properties wired through both approaches.Īnnotation wiring is not turned on in the Spring container by default. ![]() So instead of using XML to describe a bean wiring, you can move the bean configuration into the component class itself by using annotations on the relevant class, method, or field declaration.Īnnotation injection is performed before XML injection. Starting from Spring 2.5 it became possible to configure the dependency injection using annotations.
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