For our example, we’ll use a module called ‘Employee’. For this example, we’ll need to display an employee’s personal details, in addition to other information, on the main employeeDetail page. We’ll separate the main page into several small jsp pages. The file that will display the employee’s personal information is empPersonalDetails.jsp and that page must be included in the main page (employeeDetails.jsp), using action.
Let’s assume that you have used apache tiles to provide consistent layout for each such sub-page (due to some requirement or just for decorative purpose) and you want to include that through a controller call. To accomplish that, you will use code similar to what we have detailed below:
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If you have worked on a software development team, you will recognize these scenarios:
Every designer and developer knows that user input Validation is a vital part of development for any application. Since the inception of the various MVC frameworks like Struts, Spring, JSF etc., the method of implementing validation has been included in application design considerations. These frameworks set the standards for implementing validation by providing the necessary supporting classes, and certainly, having clean design for validation has its benefits with respect to application maintenance.Prior to the release of version 3.0 of Spring, validation implementation required that the validator class is registered using a Spring configuration XML file. In addition, developer had to validate the fields and ensure error registration using ValidationUtils in the validate() method of the validator class. After the introduction of annotations in Spring 3.0, implementation of validation was simpler and cleaner. Developers can reduce the code by using the Hibernate Validator framework along with Spring. As of this writing, the latest version of the Hibernate Validator Framework is 5.0, which is the reference implementation of JSR-303). The following illustrates the implementation of constraints and validation using JSR-303 annotations:
JAR Dependencies: You’ll need to put the JAR files from Hibernate Validator Framework in the application classpath, which is WEB-INF/lib in a Java Web Project. Hibernate Validator 5.0 ships with a number of various JARs. While some are optional, the following are required JARs for validation implementation.
Annotate model properties: Once you have entered the above JARs in the classpath, you can use the annotations provided by them. The following is an example of a model class where you would need to annotate the properties with required constraints. Note how @Size and @NotEmpty are used.