Entitymanager merge not updating
In older versions of J2EE, the EJB 2.x specification was responsible for defining this layer.
In Java EE 5, persistence was spun off into its own specification.
On the form Submit, the POST method in the controller gets called, which calls the service layer and then the merge method in the DAO gets executed.
In the above shown package hierarchy, under JPA Content package is as follows: tag defines each property such as database registration, URL specification, username, and password. In a business component all the persistence operations fall under service classes.
In the above shown package hierarchy, create a package named ‘com.tutorialspoint.eclipselink.service’, under ‘src’ (source) package.
All the service classes named as Create Emloyee.java, Update Employee.java, Find Employee.java, and Delete Persistence; import com.tutorialspoint.eclipselink.entity. Employee; public class Create Employee In the above code the create Entity Manager Factory () creates a persistence unit by providing the same unique name which we provide for persistence-unit in file.
comes under the given package as follows: Creating an Employee class named as Create as follows: package com.tutorialspoint.eclipselink.service; import javax.persistence. The entitymanagerfactory object will create the entitymanger instance by using create Entity Manager () method.