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RamandeepS Singh

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since Aug 25, 2009

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Recent posts by RamandeepS Singh

Update column in child table on Updating some column in parent table

Hi

I have one table user and child table user_details and in both tables I have column named as status.

I want that whenever I update the status column in user table it also get updated in user_details table

I am using hibernate

Thanks Ramandeep S

9 years ago

Object Relational Mapping

Manually installing maven plugin

Hi

I am on proxy network,proxy is not allowing maven to connect to central repository
Can we somehow download and install the maven plugins manually in local .m2 repo

Please HELP!!

Thanks
Ramandeep Singh

10 years ago

Other Build Tools

EJB Client as Jsp

Hi

I am new o EJB
I have created a new EJB app . In EJB module i created a package having one interface and one stateless bean

and exported the jar using the eclispe IDE

Then i deployed the jar in Deploy folder of JBoss

I created one folder named client.war in jBoss deploy directory and created 2 Jsp's there

index.jsp

WebClient.jsp

<%@ page contentType="text/html; charset=UTF-8" %>
<%@ page import="com.practise.ejb.*,
javax.naming.*"%>
<%!
private CalculatorRemote calculator = null;
float result=0;
public void jspInit() {
try {
InitialContext ic = new InitialContext();
System.out.println("Loadung Calculator Bean <<<<<<<<<<>>>>>>>>>>>>>>>>");
calculator = (CalculatorRemote) ic
.lookup("CalculatorBean/remote");
System.out.println("Loaded Calculator Bean <><><><><><><><><><><><><><><><><><><><");
//CalculatorBean
} catch (Exception ex) {
System.out.println("Error:"+
ex.getMessage());
}
}
public void jspDestroy() {
calculator = null;
}
%>
<%
try {
String s1 = request.getParameter("num1");
String s2 = request.getParameter("num2");
String s3 = request.getParameter("group1");
System.out.println("<><><><><>"+s3+"calculator "+calculator);
if ( s1 != null && s2 != null ) {
Float num1 = new Float(s1);
Float num2 = new Float(s2);
if(s3.equals("add"))
result=calculator.add(num1.floatValue(),
num2.floatValue());
else if(s3.equals("sub"))
result=calculator.subtract(num1.floatValue(),
num2.floatValue());
else if(s3.equals("multi"))
result=calculator.multiply(num1.floatValue(),
num2.floatValue());
else
result=calculator.division(num1.floatValue(),
num2.floatValue());
%>
<p>
<b>The result is:</b> <%= result %>
<p>
<%
}
}// end of try
catch (Exception e) {
e.printStackTrace ();
//result = "Not valid";
}
%>

Its not able to find the Bean

Please let me know if i am going wrong

Thanks In Advance

Ramandeep S.

10 years ago

EJB and other Jakarta /Java EE Technologies

Creating new roles in RBAC

Hi

Is there any security framework like apache shiro or Spring security which allows adding new roles and giving them priviliges

Example

i have 2 roles in my Database
1) ADMIN
2) USER

and my application is running and the administrator of the application wants to add a new role EMPLOYEE and allow that role to access some URLs of the USER role
so via application administrator of the application will be able to add new role

Thanks in Advance

Ramandeep Singh

10 years ago

EJB and other Jakarta /Java EE Technologies

Glassfish server debug mode

Hi

I have installed the glassfish server adapter in eclipse.
I want run glassfish server always in debug mode so that on single change glassfish does not autopublish the application, it is really time consuming while development

Please help me

Thanks in Advance
Ramandeep Singh

11 years ago

When to Use CollectionTable and when to Use OneToMany

Hi

Can anybody suggest me, when should we use @CollectionTable and When to use @OneToMany

I think @OneToMany is always Beneficial

We we are Using @CollectionTable i think there will be no Improvement in Performance as well as it limits us that we can not persist without parent and even we can not query them independently

However we can achieve the same functionality with more flexibility by using @oneToMany, We Just have to write few lines more in our mapping

Please Correct me if i am Wrong

Thanks
Ramandeep Singh

11 years ago

Object Relational Mapping

hibernate one to one with multiple table

Hi Vinay

I think Bill Gorder is right. You can achive it using Discriminator column with Inheritance type= Joined

Regards
Ramandeep Singh

11 years ago

Object Relational Mapping

Discriminator column not accessible

Hi Everyone

in @inheritance type Joined

I have class person, employee and Student

i have common columns in Person , and getters setters for discriminator column if i have to access it from person class

so when i am saving the Employee or Student record and then retrieving Person record, It is giving me discriminator column value as NULL
but after restarting the server its giving me value accordingly

if i manually set the value of discriminator column value and then save and retrieve then its giving me the value (Do i need to manaully set the discriminator column value?)
then what is benefit of using discriminator column

why should i not use OneToMany relation of person with employee and student having column Type and via enum i can enter the perspective value into the column
and i will also apply lazy fetching on that columns

Please Suggest

Thanks In Advance
Ramandeep Singh

11 years ago

Object Relational Mapping

Acegi spring security with Jsp Servlets

Hi

i have web application in Jsp/servlets and EJB, Is there any way to integrate Acegi security with jsp/servlets

Please Help!!

Thanks & Regards
Ramandeep Singh

11 years ago

Other Java Products

Where clause on attribute of @collectiontable JPA

Hi

Thanks for you reply

I am getting the following error while executing the above query

unknown state or association field [number] of class [com.practise.demo.Phone].

Thanks & Regards
Ramandeep Singh

11 years ago

Object Relational Mapping

Where clause on attribute of @collectiontable JPA

Hi

I have table person in which i wrote the following code

public class person{

private String name;

private String lastName;

@CollectionTable(name = "PHONE")
private Set<Phone> phones;

// getters and setters

}

in Phone class

@Embeddable
public class Phone{
private string number;
private String type;

getters and setter

}

i have to fetch person record having phone number=xxxxxxxx

Please help me!

Thanks
Ramandeep Singh

11 years ago

Object Relational Mapping

N tier architecture

Hi
I am newbie to programming
I am developing n-tier application in java

Following is my app structure

In Controller package
UserController
AdminController

In Service Package
UserService
AdminService

In Dao Pacakge
UserDao
MessagesDao

Now in userService i have method named
getUserMessages(User user);

In AdminController i need the same method
Do i rewrite the same method or i should use userservice in AdminController

Or should i make MessageService instead of AdminService

OR should i go for three service Classess
AdminService
UserService
CommonService

And Admin and UserService extends CommonService

Thanks In Advance
Ramandeep Singh

11 years ago

Java in General

Hibernate eager fetching issue

Hi

I am newbie to hibernate

i have a self refrencing class user having one to many relation
i am using association table for one to many

i have 4 users having following records
1 abc
2 def
3 ghi
4 jkl

following records are there in association table
user child
1 2
1 3
1 4

when i am using lazy fetching and using criteria query to fetch user 1
its giving me 1 record and when i get childs its giving me 3 records that is working fine

BUT when i change it to eager
It is giving me thrice record 1

Thanks
Ramandeep Singh

11 years ago

Object Relational Mapping

get Action name in interceptor

Hello

Is there any way in Spring to get the action name which is called in interceptors

say i have an interceptor in which i have implemented the preHandle in which i want to fetch the action name which is called called

Thanks
Ramandeep S

12 years ago

Jquery ajax issue

Bear Bibeault wrote:Why block? Use the success callback to perform any operations that need to wait for the response.

Its returning me undefined... please look the above script i poted.. i used callback

but it was returning me as of async request

Thanks
Ramandeep S

12 years ago

HTML Pages with CSS and JavaScript