Hi,I was developed a simple JPA web application in google app engine to
create a employee entity.But its not showing any entities in Datastore.Can
anyone help me please(i fallowed
https://developers.google.com/appengine/docs/java/datastore/jpa/overview).
Employee.java
package com.ravi.app;
import javax.persistence.Entity;
import javax.persistence.Id;
@Entity
public class Employee {
private int eid;
private String ename;
@Id
public int getEid() {
return eid;
}
public void setEid(int eid) {
this.eid = eid;
}
public String getEname() {
return ename;
}
public void setEname(String ename) {
this.ename = ename;
}
}
ServletClass
package com.ravi.app;
import java.io.IOException;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;
import javax.servlet.http.*;
@SuppressWarnings("serial")
public class RaviServlet extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
resp.setContentType("texthtml");
resp.getWriter().println("Hello, world");
EntityManagerFactory emf =
Persistence.createEntityManagerFactory("transactions-optional");
EntityManager em = emf.createEntityManager();
EntityTransaction tx=em.getTransaction();
em.getTransaction().begin();
Employee e=new Employee();
int i=Integer.parseInt(req.getParameter("eid"));
String name=req.getParameter("ename");
e.setEid(i);
e.setEname(name);
em.persist(e);
tx.commit();
em.close();
}
}
persistence.xml in web-->meta-inf-classes-->persistence.xml
<?xml version="1.0" encoding="UTF-8" ?>
<persistence 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_1_0.xsd";
version="1.0">
<persistence-unit name="transactions-optional">
<provider>org.datanucleus.store.appengine.jpa.DatastorePersistenceProvider</provider>
<properties>
<property name="datanucleus.NontransactionalRead" value="true"/>
<property name="datanucleus.NontransactionalWrite"
value="true"/>
<property name="datanucleus.ConnectionURL" value="appengine"/>
</properties>
</persistence-unit>
</persistence>
web.xml
<?xml version="1.0" encoding="utf-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xmlns="http://java.sun.com/xml/ns/javaee";
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd";
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"; version="2.5">
<servlet>
<servlet-name>Ravi</servlet-name>
<servlet-class>com.ravi.app.RaviServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Ravi</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>login.html</welcome-file>
</welcome-file-list>
</web-app>
</persistence>
login.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<!-- The HTML 4.01 Transitional DOCTYPE declaration-->
<!-- above set at the top of the file will set -->
<!-- the browser's rendering engine into -->
<!-- "Quirks Mode". Replacing this declaration -->
<!-- with a "Standards Mode" doctype is supported, -->
<!-- but may lead to some differences in layout. -->
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Hello App Engine</title>
</head>
<body>
<h1>Hello App Engine!</h1>
<center>
<form name="login" method="get">
Userid<input type="text" name="eid"><br>
Username<input type="text" name="ename"><br>
<input type="submit" value="Go">
</form>
</center>
</body>
</html>
--
You received this message because you are subscribed to the Google Groups
"Google App Engine" group.
To view this discussion on the web visit
https://groups.google.com/d/msg/google-appengine/-/HQkQ-YpJScIJ.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/google-appengine?hl=en.
