Drop-down lists are the one of the most frequent elements in web forms. In HTML you can create such control using appropriate tags: < form:select > – parent tag of drop-down list and < form:option > – child tag of < form:select > tag. Spring MVC tag library has its own solution for the drop-down lists. In this post I ...

This time I want to talk about Strategy design pattern. In this way I start articles about behavioral design patterns. These kind of patterns represent some schemas of interaction between objects to make a code more flexible and well organized.The most essential point of this approach is loose coupling between objects. The Strategy should be used when you have several ...

It’s hard to imagine a web-application which doesn’t has some validation logic for an user data. Almost all user’s data has some constraints, e.g. date of birth should consist of day, month, year etc. Spring MVC has its own solution for the data validation, and it’s become available with the help of Validator interface. Usage of Spring MVC Validator A ...

The one of creational design patterns is a Prototype design pattern. Despite that the Prototype is the creational pattern it distinguishes from other patterns by a concept. I mean that the Prototype in some sense creates itself. I’m going to explain it bellow. All magic of the Prototype pattern is based on a clone() method of a java Object. So ...

Sometimes there is a need to create a complex object in application. The one solution for this is a Factory pattern, the another one is a Builder design pattern. In some situation you even can combine these two patterns. But in this article I want to examine the Builder design pattern. The first thing which I need to say that ...

Development of web-applications with the help of Spring MVC implies creation of several logical layers of architecture. One of the layers is a DAO (Repository) layer. It is responsible for communication with a database. If you developed the DAO layer at least once, you should know that it involves a lot of boilerplate code. A Spring Data take a part ...

This time I want to make an overview of testing framework Mockito. Definitely this is one of the most popular tools for the testing of java code. I have already made the overview of the Mockito’s competitor – EasyMock. This post will be based on the sample application from the post about EasyMock. I mean classes which represent coffee machine ...

In the world of software development radiobuttons are essential part of graphic user interface. Spring MVC tag library provides special tag for this element of form. If to be more precisely there are two tags for this purpose: radiobutton, radiobuttons. Both of them are useful for a particular task. As you understand I’m going to show how to use these ...

I have already published the post about processing of ‘checkbox’ tag using Spring MVC tag library. Now I want to develop this theme and proceed with the ‘checkboxes’ tag. It’s not much harder, but in some cases you’d better to use it. In this article I will provide examples of Spring ‘checkboxes’ tag in conjunction with java.util.List and java.util.Map, so ...