New to J2EE; Best Practices
Hi everyone, and thanks in advance for all of your help.
I'm somewhat new to J2EE, at least in the sense of creating my own application. I work for a small software company in New England, and have to work on an enterprise application as part of my job; unfortunately, I don't get much exposure to the total of J2EE. Instead, most of my work is on small extensions, database scripts, or external projects that don't quite give me the exposure I'm looking for.
As an exercise, I've decided to put together a sample J2EE application. I've spent time reading the (many) J2EE tutorials out there, but I'm having trouble putting it all together. This application works, but I know that I've used some bad patterns, and was hoping to get some feedback. My application consists of 4 Java classes and 8 JSPs, but none over 100 lines, and only 1 above 50.
One final note before I start: yes, I know there are some frameworks out there that would help; I plan on migrating to Struts at some point. However, I wanted to make sure I understand the core J2EE structure before I delved into that.
My application simply allows a user to add, edit, or delete entries in a database. The database consists of 1 table (Projects), with two fields: an id, and a name.
The first page, Projects.jsp, lists the current projects in the database for the user:
<%@ page contentType="text/html; charset=UTF-8" %>
<%@ page pageEncoding="UTF-8" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<jsp:useBean id="projectsDAO"
class="com.emptoris.dataAccess.ProjectsDataAccessObject"
scope="application" />
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Projects</title>
</head>
<body>
<form name="projectsForm"
action="<%= response.encodeURL("ProjectsController.jsp") %>"
method="post">
<c:if test="${projectsDAO.projects.numberOfProjects > 0}">
<table>
<tr>
<th>Select</th>
<th>ID</th>
<th>Name</th>
</tr>
<c:forEach items="${projectsDAO.projects.projects}" var="project"
step="1">
<tr>
<td>
<input type="radio" name="projectId" value="${project.id}" />
</td>
<td><c:out value="${project.id}" /></td>
<td><c:out value="${project.name}" /></td>
</tr>
</c:forEach>
</table>
<input type="submit" name="action" value="Edit Project" />
<input type="submit" name="action" value="Delete Project" />
</c:if>
<input type="submit" name="action" value="Add New Project" />
</form>
</body>
</html>The ProjectsDataAccessObject is a class that simply mirrors the table in the database. Adding, editing, or removing entries in this class will modify the database accordingly:
package com.emptoris.dataAccess;
import java.sql.*;
import com.emptoris.model.*;
public class ProjectsDataAccessObject {
private Connection connection;
private Statement statement;
private Projects projects;
public ProjectsDataAccessObject() throws ClassNotFoundException,
SQLException {
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
connection =
DriverManager.getConnection(
"jdbc:microsoft:sqlserver://AFRASSO:1433", "sa", "password"
statement = connection.createStatement();
statement.execute("USE test");
public Project getProject(int id) throws SQLException {
Projects projects = getProjects();
Project project = projects.getProject(id);
return project;
public Projects getProjects() throws SQLException {
if (projects == null) {
projects = new Projects();
String query = "SELECT id, name FROM Projects";
ResultSet resultSet = statement.executeQuery(query);
Project project;
while(resultSet.next()) {
project = new Project();
project.setId(resultSet.getInt(1));
project.setName(resultSet.getString(2));
projects.addProject(project);
return projects;
public void addNewProject(Project project) throws SQLException {
String query =
"INSERT INTO Projects (name) VALUES ('" + project.getName() + "')";
statement.execute(query);
query =
"SELECT MAX(id) FROM Projects";
ResultSet resultSet = statement.executeQuery(query);
resultSet.next();
project.setId(resultSet.getInt(1));
projects.addProject((Project) project.clone());
public void removeExistingProject(int id) throws SQLException {
String query =
"DELETE FROM Projects WHERE id = " + id;
statement.execute(query);
projects.removeProject(id);
public void updateExistingProject(Project project) throws SQLException {
String query =
"UPDATE Projects SET name = '" + project.getName() +
"' WHERE id = " + project.getId();
statement.execute(query);
projects.getProject(project.getId()).setName(project.getName());
}So the first question I have is: is this appropriate? I've set up the data access object correctly? I feel like I'm basically reproducing the Projects class... do I even need this class anymore? I certainly don't use it in any of the JSP pages (as you will see).
Also, I've simply added it to the application context here. Is that the correct way to create and access a data access object like this one?
The second question is: the form's action parameter is a JSP page that acts as a semi-controller, reads the parameters from the form, and passes that information to a class, which then determines where next to send the application. Does this make sense? I'm not really sure of the idea of using a JSP page as a controller, but I don't know any other way to get the results of the form to the controller class.
Here is the controller JSP, ProjectsController.jsp:
<%@ page contentType="text/html; charset=UTF-8" %>
<%@ page pageEncoding="UTF-8" %>
<jsp:useBean id="projectsDAO"
class="com.emptoris.dataAccess.ProjectsDataAccessObject"
scope="application" />
<jsp:useBean id="projectsController"
class="com.emptoris.controller.ProjectsController"
scope="request">
<jsp:setProperty name="projectsController" param="action" property="action" />
</jsp:useBean>
<jsp:forward page="<%= response.encodeURL(
projectsController.getDestinationPage()
) %>" />and here is the ProjectsController class:
package com.emptoris.controller;
public class ProjectsController {
private String action;
public ProjectsController() {
public String getDestinationPage() {
if (action.equals("Add New Project"))
return "AddProject.jsp";
else if (action.equals("Edit Project"))
return "EditProject.jsp";
else if (action.equals("Delete Project"))
return "DeleteProject.jsp";
return null;
public void setAction(String action) {
this.action = action;
}I'll stop there. I think this is enough information to give me feedback on what I've done thus far. If I've been unclear about something, please let me know and I'll fill in the blanks, or post more code if necessary. Also, feel free to comment on other aspects of the design and style that you see in this code; I'm here to learn, so even if I haven't brought it up, that just means I don't yet see the issues of what I've done yet. :)
Thanks again for all of your help!
Regards,
Anthony Frasso
hi,
My best advise not to for any IDE.
If you do all the things manually, you will get the idea of the reason of doing. if you go with IDE, for ex, if you are creating session bean, IDE itself will create some files for you, these things you will not get to know.
if you create these things manually, usually you will get lot of errors, so you will get lot of experience than using any IDE.
if you are going to develop any project or application at that time you can use NetBeans or eclipse or some other ide u like.
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@)O.P.
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Additionally, your partial post that was accidentally created as a duplicate to this one
has been removed before it confuses anyone. -
I have a small office (10 computers with five users) that have a Windows 2003 server that has a corrupted AD. Their 2003 server R2 is essentially a file server and provides authentication. They purchased a new Dell 2012 R2 server.
It seems easier to me to just create a new domain (using their public domain name).
But I need as little office downtime. as possible . Therefore I would like to promote this server to its new domain on the same lan as the current domain server. I plan to manually replicate the users and folder permissions. Once done, I plan to
remove the old server from the network and join the office computers to the new domain.
They also they are also running a legacy application that will require some tweaking by another tech. I have been hoping to prep the new domain prior to new legacy tech arriving. That is why I would like both domain to co-exist temporarily. I have read
that the major issues involved in this kind of temporary configuration will then be related to setting up dns. They are using the firewall to provide dhcp.
Are there any best practices documents for this situation?
Or is there a better or simpler strategy?
Gary MetzI followed below two links. I think it should be the same even though the links are 2008 R2 migration steps.
http://kpytko.pl/active-directory-domain-services/adding-first-windows-server-2008-r2-domain-controller-within-windows-2003-network/
http://blog.zwiegnet.com/windows-server/migrate-server-2003-to-2008r2-active-directory-and-fsmo-roles/
Hope this help! -
I posted a few days ago re failing HDD on mid-2007 iMac. Long story short, took it into Apple store, Genius worked on it for 45 mins before decreeing it in need of new HDD. After considering the expenses of adding memory, new drive, hardware and installation costs, I got a brand new iMac entry level (21.5" screen,
2.7 GHz Intel Core i5, 8 GB 1600 MHz DDR3 memory, 1TB HDD running Mavericks). Also got a Superdrive. I am not needing to migrate anything from the old iMac.
I was surprised that a physical disc for the OS was not included. So I am looking for any Best Practices for setting up this iMac, specifically in the area of backup and recovery. Do I need to make a boot DVD? Would that be in addition to making a Time Machine full backup (using external G-drive)? I have searched this community and the Help topics on Apple Support and have not found any "checklist" of recommended actions. I realize the value of everyone's time, so any feedback is very appreciated.OS X has not been officially issued on physical media since OS X 10.6 (arguably 10.7 was issued on some USB drives, but this was a non-standard approach for purchasing and installing it).
To reinstall the OS, your system comes with a recovery partition that can be booted to by holding the Command-R keys immediately after hearing the boot chimes sound. This partition boots to the OS X tools window, where you can select options to restore from backup or reinstall the OS. If you choose the option to reinstall, then the OS installation files will be downloaded from Apple's servers.
If for some reason your entire hard drive is damaged and even the recovery partition is not accessible, then your system supports the ability to use Internet Recovery, which is the same thing except instead of accessing the recovery boot drive from your hard drive, the system will download it as a disk image (again from Apple's servers) and then boot from that image.
Both of these options will require you have broadband internet access, as you will ultimately need to download several gigabytes of installation data to proceed with the reinstallation.
There are some options available for creating your own boot and installation DVD or external hard drive, but for most intents and purposes this is not necessary.
The only "checklist" option I would recommend for anyone with a new Mac system, is to get a 1TB external drive (or a drive that is at least as big as your internal boot drive) and set it up as a Time Machine backup. This will ensure you have a fully restorable backup of your entire system, which you can access via the recovery partition for restoring if needed, or for migrating data to a fresh OS installation. -
(Request for:) Best practices for setting up a new Windows Server 2012 r2 Hyper-V Virtualized AD DC
Could you please share your best practices for setting up a new Windows Server 2012 r2 Hyper-V Virtualized AD DC, that will be running on a new WinSrv 2012 r2 host server. (This
will be for a brand new network setup, new forest, domain, etc.)
Specifically, your best practices regarding:
the sizing of non virtual and virtual volumes/partitions/drives,
the use of sysvol, logs, & data volumes/drives on hosts & guests,
RAID levels for the host and the guest(s),
IDE vs SCSI and drivers both non virtual and virtual and the booting there of,
disk caching settings on both host and guests.
Thanks so much for any information you can share.A bit of non essential additional info:
We are small to midrange school district who, after close to 20 years on Novell networks, have decided to design and create a new Microsoft network and migrate all of our data and services
over to the new infrastructure . We are planning on rolling out 2012 r2 servers with as much Hyper-v virtualization as possible.
During the last few weeks we have been able to find most of the information we need to undergo this project, and most of the information was pretty solid with little ambiguity, except for
information regarding virtualizing the DCs, which as been a bit inconsistent.
Yes, we have read all the documents that most of these posts tend point to, but found some, if not most are still are referring to performing this under Srvr 2008 r2, and haven’t really
seen all that much on Srvr2012 r2.
We have read these and others:
Introduction to Active Directory Domain Services (AD DS) Virtualization (Level 100),
Virtualized Domain Controller Technical Reference (Level 300),
Virtualized Domain Controller Cloning Test Guidance for Application Vendors,
Support for using Hyper-V Replica for virtualized domain controllers.
Again, thanks for any information, best practices, cookie cutter or otherwise that you can share.
Chas.
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