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Our JCart Administration site should only be accessible to authorized users only. So, we are going to use SpringSecurity to define the security constraints. Let us add the following spring-security dependencies to jcart-admin/pom.xml. <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-security</artifactId> </dependency> <dependency> <groupId>org.thymeleaf.extras</groupId> <artifactId>thymeleaf-extras-springsecurity4</artifactId> </dependency> If we have predefined set of Roles then we can specify the URL patterns and its required Roles something like this: http .authorizeRequests() .antMatchers("/login","/login/form**","/register","/logout").permitAll() .antMatchers("/admin","/admin/**").hasRole("ADMIN") .anyRequest().authenticated() .and() But we need provision to dynamically create new roles as well, hence we can’t statically define constraints using role names.

As I am not really a good UI designer I searched for a free good looking UI website Admin templates and I found this fantastic template https://almsaeedstudio.com/preview. We will be using this template for our Administration web application. We are going to use Thymeleaf templates for our View layer. Thymeleaf offers facelets style templating mechanism. Basically we need 2 layout templates, one for unauthorized views like Login/ForgotPassword etc and another for authorized users.

We are going to create the JPA Entities for the database tables we designed. @Entity @Table(name="users") public class User { @Id @GeneratedValue(strategy=GenerationType.AUTO) private Integer id; @Column(nullable=false) @NotEmpty() private String name; @Column(nullable=false, unique=true) @NotEmpty @Email(message="{errors.invalid_email}") private String email; @Column(nullable=false) @NotEmpty @Size(min=4) private String password; private String passwordResetToken; @ManyToMany(cascade=CascadeType.MERGE) @JoinTable( name="user_role", joinColumns={@JoinColumn(name="USER_ID", referencedColumnName="ID")}, inverseJoinColumns={@JoinColumn(name="ROLE_ID", referencedColumnName="ID")}) private List<Role> roles; //setters & getters } @Entity @Table(name="roles") public class Role { @Id @GeneratedValue(strategy=GenerationType.AUTO) private Integer id; @Column(nullable=false, unique=true) @NotEmpty private String name; @Column(length=1024) private String description; @ManyToMany(mappedBy="roles") private List<User> users; @ManyToMany @JoinTable( name="role_permission", joinColumns={@JoinColumn(name="ROLE_ID", referencedColumnName="ID")}, inverseJoinColumns={@JoinColumn(name="PERM_ID", referencedColumnName="ID")}) private List<Permission> permissions; //setters & getters } @Entity @Table(name="permissions") public class Permission { @Id @GeneratedValue(strategy=GenerationType.

While developing database driven applications using some ORM framework, some people prefer Object first approach and others follow DB first approach. I prefer DB first approach. So, let us start listing down all the domain entities in our JCart application domain. Product Category Customer Order OrderItem Cart Address User Role Permission Let us create the database tables as follows: Though we identified Cart as a domain entity, we are not creating the table for holding the Cart details.

Let us create a root pom type maven project with 3 sub-modules jcart-core, jcart-admin and jcart-site. jcart-core module will contain all the core logic excluding web related stuff. jcart-admin module will contain all the administration related web functionality like Controllers, Security, Validators etc. jcart-site module will contain all the shoppingcart related web functionality like Controllers, Security, Validators etc. All these modules use SpringBoot, but as of now STS/IntellijIdea are not providing option to create multi-module SpringBoot application, we will be creating Maven modules and then configure SpringBoot dependencies manually.

Now that we have completed the most difficult part (writing Introduction to technical article series is much harder than you think!!), so let’s start the fun part. Coding!!! Note: It is going to be a fast paced tutorial. Obviously we can’t cover every little bit of all the technologies used in our application. So I would suggest to explore more on individual technologies like Spring, Thymeleaf on your own. I would strongly suggest to checkout the code from https://github.

For our JCart application development we will be using the following Softwares/Tools. JDK 8 SpringSource Tool Suite (STS) MySQL Git Maven Jenkins SonarQube Apache/Nginx WebServer I am not going to explain how to install JDK or MySQL because there are plenty of articles you can find on internet. If you are using Ubuntu based Linux Operating System then you can refer my article My Development Environment Setup on Linux to setup Java development tool chain.

In our previous article JCart Requirements Analysis we have listed out all the requirements that we need to implement for JCart application. Now we need to come up with an implementation and release plan. As we are following iteration model, we will plan for N iterations where in each iteration we will implement some usecases. After listing out all the implementation tasks and based on the task dependencies, we came up with the following Iteration plan.

Selecting the right technology stack is very crucial and plays an important role in project success. Many of the architects (unknowingly??!!) try to make complex designs by trying to use all kinds of latest and greatest stuff. On the other hand some architects try to be in their comfort zone by limiting their technology stack to the technologies with which they are comfortable. Both approaches are dangerous. One should understand the business needs and pick the technologies that are necessary for project.

For building our JCart e-commerce application we will develop two web applications, one for ShoppingCart and another one for Administration. Let us explore the requirements of both ShoppingCart and Administration websites in detail. ShoppingCart Site Requirements Home Page: This page shows list of categories and few products in each category. From this screen customers can click on any Category name to see all the products in that particular category or can add a product to cart.