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Validating Entity and Get Error Messages - JPA , eclipselink

 
Greenhorn
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Here is my code, I would like to Validate DeploymentConfiguration Entity before saving to database. I have 3 more different entities – I have to write validation for other entities also. Note: Finally I will call these methods and exposing as a Rest Services (Jersy)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1) DeploymentConfiguration is model/entity

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
2) DaoImplementation
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

3-.Persistence .xml
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="com.Demo.persistence"
transaction-type="RESOURCE_LOCAL">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<class>com.Demo.persistence.model.DeploymentConfiguration</class>
<shared-cache-mode>ALL</shared-cache-mode>
<properties>
<property name="eclipselink.ddl-generation" value="create-or-extend-tables" />
</properties>
</persistence-unit>
</persistence>

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

I am using below dependencies


<!-- JPA dependencies - Start -->
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>eclipselink</artifactId>
</dependency>
<!-- JPA dependencies - Start -->

<!-- Spring dependencies - Start -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
</dependency>
<!-- Spring dependencies - End -->
<!-- slf4j dependencies - Start -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>com.springsource.slf4j.log4j</artifactId>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>com.springsource.slf4j.api</artifactId>
</dependency>
<!-- slf4j dependencies - End -->
<!-- Junits dependencies - Start -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>org.springframework.test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
</dependency>
<dependency>
<groupId>org.testng</groupId>
<artifactId>testng</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>org.springframework.orm</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.servicemix.bundles</groupId>
<artifactId>org.apache.servicemix.bundles.derby</artifactId>
<scope>test</scope>
</dependency>
<!-- Junits dependencies - End -->

----------------------------------------------
I am newbie in JAVA, Springs, JPA ecipselink. –
could some one explain me how to write validations using Annotations. Note : we should use eclipselink ,springframework in our demo project, We are not using Spring MVC, we need to exposed our methods as Services (Jersy)
 
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