Bean Validation Made Simple With JSR 303 | Javalobby

Bean Validation Made Simple With JSR 303 | Javalobby

Travel of Software Developer: JSR 303 Bean Validation
Bean Validation: Integrating JSR-303 with Spring « Dutchworks Blog / Dutchworks: Enterprise Java, Open Source, software solutions, Amsterdam
5. Validation, Data Binding, and Type Conversion

JSR 303

The Java Community Process(SM) Program - JSRs: Java Specification Requests - detail JSR# 303

This JSR will define a meta-data model and API for JavaBean^TM validation based on annotations, with overrides and extended meta-data through the use of XML validation descriptors. 

• XWork Validation Framework (http://wiki.opensymphony.com/display/XW/Validation+Framework)
• Commons-Validator (http://jakarta.apache.org/commons/validator/) 
•  Hibernate Validator (http://www.hibernate.org/hib_docs/annotations/reference/en/html/validator.html)

Bean Validation Made Simple With JSR 303 | Javalobby

• JSR 303 provides an easy way of ensuring that the properties of your JavaBean(s) have the right values in them.
• Pre-JSR 303
• You probably would have needed a bunch of if-else statements to achieve the above requirements. 
• The next step is to download an implementation of JSR 303.
• Hibernate Validator 4.2.0 Final
• hibernate-validator-4.2.0.Final.jar
• hibernate-validator-annotation-processor-4.2.0.Final.jar
• slf4j-api-1.6.1.jar
• validation-api-1.0.0.GA.jar
• Simply annotate the 'Member' JavaBean we created earlier to indicate which properties need be validated. 
• @NotNull
• @NotBlank
• @Pattern
• @Past
• @Min
• @Max
• @Email
• Unit Test
• ValidatorFactory
• Validator
• violation