Question about an entry level java programmer

i was curious that if i do find a job in java as an entry level what kind of programming can i expect? i am sure some of the members over here were hired as an entry level. can you share your ideas with me? like any projects etc...

What is your background in education? I don't know how much you know of Java, but that won't be the only thing they base their choice on. You barely ever have a project that uses exclusively java. Make sure you know basics of working with databases, different operating systems...
The most important thing is that you can sell whatever you know as usefull for the job they have for you! Prepare yourself well for an interview. If you have the time, picture the type of work you expect from a vacancy. Ask yourself what technologies will be needed for that particular job and make sure you do at least know a little about them. Make sure you adapt your responses to the type of interviewer, type of company. In addition to that, don't tell people you know more than you do!
Get some understanding on OO concepts.This would be a very important thing for some, but totally unnecessary to others. For me this is quite important! If your interviewer is a manager type, he won't be able to follow what you're talking about if you start talking about design principles! If your interviewer is a techie, then this is a good thing to show.
JCP certification would be handy..From my experience this isn't a minimum requirement to get in. If the company values certificates, you can always use it afterwards to prove your dedication and get a raise once you're in. ;-)
Further knowledge in Web components and Enterprice components (eg EJB) will be pluses.Again viewed from the 'make it sellable' side. If you come bragging that you're a Spring expert and your company is against open source frameworks, that won't be a point in your advantage.

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Ah, ok. Good to know. Thanks for the info.

Getting the Win Server entries through java programme

Hi,
Windows win server have the details(Cname,ipaddress) about the connected devices.
can any body suggest the approach which gets the Cname and ipaddress from winserver using java programme
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I need java programme for getting the those details from the windows winserver
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Othere wise please suggest, is there any alternative approach for getting those details, JNI will likely be involved. I promise you there is no built-in Java functionality to get data from win server, whatever that is.
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A string of question about Locking & Isolation Level

Hi All
It is highly appreciated if someone give offer answers to my below questions
1) There are two ways of locking mechanism: Pessimistic & Optimistic. In general, do all J2EE app server support all these two ways of locking ?
2) It seems to me that setting the isolation level to "serialization" should result in using pessmistic locking. If no so, please point out my misconcept and explain to me.
3) Are there any differences in the way of entity bean programming as different locking mechansim is adopted ?
4) With regard to optimistic locking, will the app server throw out exception as data contention is detected ? Is the way of handling dependent on app server? Or It is transparent to the developer of entity bean. Please give me an e.g of j2ee app server product how to handle this scenario.
5) To adopt the approach of "optimistic" locking, do l have to implement it on my own using bean managed entity bean.
6) It seems to me that optimistic locking can achieve better concurrency. If it is inherently supported by app server for its container managed entity bean (=> totally transparent to the developer of entity bean). Is it always the rule of thumb to config the server to use "optimistic" locking instead of "pessimistic" ?
Sorry for bombarding you guys with such long list of questions. l would be very thankful if someone can help me consolidate my concept on these topics.
Also, please send your reply to [email protected] as well
thanks & regards
Danny

Hi Danny,
I became interested about the optimistic locking recently. If the topic is not long forgotten then this may make some difference!
We have attacked the optimistic locking issue by introducing audit fields (MODIFY_BY_USER, MODIFY_DATE) in tables where concurrency needs to be implemented.
We are retrieving rows from the table (for display or update) through Stateless Session Bean using simple SQL SELECT. The audit fields are fetched along with the business data and are kept at the client. While any of the concurrent users tries to update the row the audit fields are sent to the application server along with the modified business data. The relevant Entity Bean checks for any difference in the timestamp of the audit field (MODIFY_DATE) value with the value in the database. If a mismatch is found it reports a business exception to the user. Otherwise, the row is updated with the lastest timestamp value in the audit field MODIFY_DATE.
This works fine when two update operations are not concurrent, i.e., two users submit their update requests in a time lag greater than the time taken by the transaction to complete. This alone could not prevent the dirty update on the database.
Hence, to prevent any concurrent update contending for the same row you need to set the following ejbgen tag in the Entity Bean:
concurrency-strategy = Exclusive<<<<<Note: We are using Weblogic 6.1 with SP4 and CMP (no BMP).
Please let me know if you have got a better solution to tackle this issue.
Chandra.

Where is the best place to ask questions about NetBeans 6 for Java?

When it comes to Java discussions, all I can think is this forum, but what about Java Desktop Applications using NetBeans IDE 6?
Question/Query 1:
I just like to ask how I can make the Database Application Template under the Java> Java Desktop Application> Database Application:
Well, the the nice Frame with prebuilt components are good, but how can we customize the Window Icon? Has anybody in this forum and particularly Netbeans 6 users encountered the same scenario?
Question/Query 2:
How can I make a splash page with such a Database Application template too?

Hello Andy,
we talk about Photoshop, or? In this case you should use Photoshop General Discussion
You will find all the (other) communities by clicking "Adobe Communities" on the top of the window. Please have a look at
https://forums.adobe.com/welcome (see screenshot) and/or open "All communities"
Hans-Günter

Question about creating Forms in Java.

Hello , im new to Java , i find kinda weird how Java creates Forms , its pretty simple in Oracle Forms ,
why did Java designers make it this difficult ? do people say this is something bad about Java ?
when i learned about the Layout Managers that Java provides i found out how much code one have to write just to create a simple form ,my question to the experienced java developers : what do you do to create a form , do you hard code it ? , or do you use something like GUI Builder in an IDE like NetBeans for example? and is the code generated by this builder easy to deal with and modify ?
Thanks ....

HeavenBoy wrote:
Hello , im new to Java , i find kinda weird how Java creates Forms , its pretty simple in Oracle Forms ,
why did Java designers make it this difficult ? do people say this is something bad about Java ?Some Oracle Forms fans certainly do. But the truth is that Oracle Forms application tie down all the components in fixed pixels. The typical Swing form can be resized and can function at different screen resolutions. So, when designing a Java form, we don't tend to work on a fixed grid but define the sizes and positions relative to other components. What's more the interface between the form elements and the data is completely flexible, and flexibility means extra effort.
>
when i learned about the Layout Managers that Java provides i found out how much code one have to write just to create a simple form ,my question to the experienced java developers : what do you do to create a form , do you hard code it ? , or do you use something like GUI Builder in an IDE like NetBeans for example? and is the code generated by this builder easy to deal with and modify ?
Most I've tried have been a bit of a straitjacket, but I've recently been using the latest Netbeans offering and it's pretty good. I think the breakthrough was the introduction of the GroupLayout layout manager. This is a layout manager really designed for WYSIWYG form designers (pretty challenging to use hand coded).
The way these things work is that the class generated contains some methods which cannot be edited by hand, but you can add any amount of your own code without interfering with the generated code. You hook your own code snippets into the generated code, for example you can select a property of an object, say the model of a JTree, and select "user code", then type in an expression returning the TreeModel you want to use.
With listeners the designer will generate the method signature etc. but you can edit the body of the listener method.
However I would always recommend that you hand code a form or two before resorting to on of these editors because it's important you understand the code, even where a designer writes it.

Question about main difference between Java bean and Java class in JSP

Hi All,
I am new to Java Bean and wonder what is the main difference to use a Bean or an Object in the jsp. I have search on the forum and find some post also asking the question but still answer my doubt. Indeed, what is the real advantage of using bean in jsp.
Let me give an example to illustrate my question:
<code>
<%@ page errorPage="errorpage.jsp" %>
<%@ page import="ShoppingCart" %>

<jsp:useBean id="cart" scope="session" class="ShoppingCart" />
<html>
<head><title>Shopping Cart</title></head>
<body bgcolor="#FFFFFF">
Your cart's ID is: <%=cart.getId()%>.
</body>
<html>
</code>
In the above code, I can also create a object of ShoppingCart by new operator then get the id at the following way.
<code>
<%
ShoppingCart cart = new ShoppingCart();
out.println(cart.getId());
%>
</code>
Now my question is what is the difference between the two method? As in my mind, a normal class can also have it setter and getter methods for its properties. But someone may say that, there is a scope="session", which can be declared in an normal object. It may be a point but it can be easily solved but putting the object in session by "session.setAttribute("cart", cart)".
I have been searching on this issue on the internet for a long time and most of them just say someting like "persistance of state", "bean follow some conventions of naming", "bean must implement ser" and so on. All of above can be solved by other means, for example, a normal class can also follow the convention. I am really get confused with it, and really want to know what is the main point(s) of using the java bean.
Any help will be highly apprecaited. Thanks!!!
Best Regards,
Alex

Hi All,
I am new to Java Bean and wonder what is the main
difference to use a Bean or an Object in the jsp. The first thing to realize is that JavaBeans are just Plain Old Java Objects (POJOs) that follow a specific set of semantics (get/set methods, etc...). So what is the difference between a Bean and an Object? Nothing.
<jsp:useBean id="cart" scope="session" class="ShoppingCart" />
In the above code, I can also create a object of
ShoppingCart by new operator then get the id at the
following way.
ShoppingCart cart = new ShoppingCart();
out.println(cart.getId());
...Sure you could. And if the Cart was in a package (it has to be) you also need to put an import statement in. Oh, and to make sure the object is accessable in the same scope, you have to put it into the PageContext scope. And to totally equal, you first check to see if that object already exists in scope. So to get the equivalant of this:
<jsp:useBean id="cart" class="my.pack.ShoppingCart"/>Then your scriptlet looks like this:
<%@ page import="my.pack.ShoppingCart %>
<%
ShoppingCart cart = pageContext.getAttribute("cart");
if (cart == null) {
    cart = new ShoppingCart();
    pageContext.setAttribute("cart", cart);
%>So it is a lot more work.
As in my mind, a normal class can also
have it setter and getter methods for its properties.True ... See below.
But someone may say that, there is a scope="session",
which can be declared in an normal object.As long as the object is serializeable, yes.
It may be
a point but it can be easily solved but putting the
object in session by "session.setAttribute("cart",
cart)".Possible, but if the object isn't serializable it can be unsafe. As the point I mentioned above, the useBean tag allows you to check if the bean exists already, and use that, or make a new one if it does not yet exist in one line. A lot easier than the code you need to use otherwise.
I have been searching on this issue on the internet
for a long time and most of them just say someting
like "persistance of state", "bean follow some
conventions of naming", "bean must implement ser" and
so on. Right, that would go along the lines of the definition of what a JavaBean is.
All of above can be solved by other means, for
example, a normal class can also follow the
convention. And if it does - then it is a JavaBean! A JavaBean is any Object whose class definition would include all of the following:
1) A public, no-argument constructor
2) Implements Serializeable
3) Properties are revealed through public mutator methods (void return type, start with 'set' have a single Object parameter list) and public accessor methods (Object return type, void parameter list, begin with 'get').
4) Contain any necessary event handling methods. Depending on the purpose of the bean, you may include event handlers for when the properties change.
I am really get confused with it, and
really want to know what is the main point(s) of
using the java bean.JavaBeans are normal objects that follow these conventions. Because they do, then you can access them through simplified means. For example, One way of having an object in session that contains data I want to print our might be:
<%@ page import="my.pack.ShoppingCart %>
<%
ShoppingCart cart = session.getAttribute("cart");
if (cart == null) {
    cart = new ShoppingCart();
    session.setAttribute("cart", cart);
%>Then later where I want to print a total:
<% out.print(cart.getTotal() %>Or, if the cart is a JavaBean I could do this:
<jsp:useBean id="cart" class="my.pack.ShoppingCart" scope="session"/>
Then later on:
<jsp:getProperty name="cart" property="total"/>
Or perhaps I want to set some properties on the object that I get off of the URL's parameter group. I could do this:
<%
ShoppingCart cart = session.getAttribute("cart");
if (cart == null) {
    cart = new ShoppingCart();
    cart.setCreditCard(request.getParameter("creditCard"));
    cart.setFirstName(request.getParameter("firstName"));
    cart.setLastName(request.getParameter("lastName"));
    cart.setBillingAddress1(request.getParameter("billingAddress1"));
    cart.setBillingAddress2(request.getParameter("billingAddress2"));
    cart.setZipCode(request.getParameter("zipCode"));
    cart.setRegion(request.getParameter("region"));
    cart.setCountry(request.getParameter("country"));
    pageContext.setAttribute("cart", cart);
    session.setAttribute("cart", cart);
}Or you could use:
<jsp:useBean id="cart" class="my.pack.ShoppingCart" scope="session">
<jsp:setProperty name="cart" property="*"/>
</jsp:useBean>The second seems easier to me.
It also allows you to use your objects in more varied cases - for example, JSTL (the standard tag libraries) and EL (expression language) only work with JavaBeans (objects that follow the JavaBeans conventions) because they expect objects to have the no-arg constuctor, and properties accessed/changed via getXXX and setXXX methods.
>
Any help will be highly apprecaited. Thanks!!!
Best Regards,
Alex

Theorical question about declaration/definition in java

Hi, we know the difference between declaration and definition:
-declaration: no memory is allocated.
-definition: memory is allocated.
In C/C++ if we want to define a variable we can make
int x;or
int x = 5; (we assign a value too)
while, if we just want to declare we can make
extern int x;Is there a way in java to simply declare a variable? According to me just arrays can be declared with
String[] arrayString;while istructions like
String myString;are definition as they allocate at least a String reference on the stack...am I wrong?

Squall867 wrote:
Hi, we know the difference between declaration and definition:
-declaration: no memory is allocated.
-definition: memory is allocated.That's not the definition I learned, back when dinosaurs roamed the earth, men lived in caves and used pterodactyls for airplanes, and computers were made of rocks.
Is there a way in java to simply declare a variable? According to me just arrays can be declared withThis is a pretty meaningless question.
In Java, whenever you declare/define a variable (there is no distinction), space is allocated for that variable. It's at least 1 byte for a byte or boolean, at least 2 bytes for a char or a short, at least 4 bytes for an int, float, or reference, and at least 8 bytes for a double or long. A given JVM implementation may actually use more bytes for any given type for word-alignment performance optimization.
Is there a way in java to simply declare a variable? According to me just arrays can be declared with
String[] arrayString;
This declares a reference variable of type reference to array of String. It will occupy at least 4 bytes.
while istructions like
String myString;are definition as they allocate at least a String reference on the stack...am I wrong?This declares a reference variable of type reference to String. It will occupy at least 4 bytes.
Note that an array reference variable is no different than any other reference variable.
Also note that for any variable, whether it lives on the stack or on the heap depends only on whether it's a member variable or a local variable. If objects are allowed to be created on the stack in future versions of Java, that distinction will get slightly more complex.

Question About Xerces Parser and Java JAXP

Hi,
I have confusion about both of these API Xerces Parser and Java JAXP ,
Please tell me both are used for same purpose like parsing xml document and one is by Apache and one is by sun ?
And both can parse in SAX, or DOM model ?
Is there any difference in performane if i use xerces in my program rather then JAXP, or is ther any other glance at all.
Please suggest some thing i have and xml document and i want to parse it.
Thanks

Hi
Xerces is Apaches implementation of W3C Dom specifiacation.
JAXP is a API for XML parsing its not implementation.
Sun ships a default implementation for JAXP.
you have factory methods for selecting a parser at run time or you can set in some config file about what is the implementaion class for the SAXParser is to be chosen (typically you give give the class file of xerces sax parser or dom parser etc..)
go to IBM Developerworks site and serch for Xerces parser config. which have a good explination of how to do it.
and browse through j2ee api .may find how to do it.

Question about DB lock level

From the manual we can only select row level locking / table level locking ( LockLevel=0/1)
Can I make it don't lock at all for READ only DB?

Through configuration you can select row level locking (LockLevel=0, the default) or database level locking (LockLevel=1). Datase level locking locks the entire database in eXclusive mode for every transaction and so effectively serialises access to the entire database. Table level locking can be influenced only by using optimiser hints and in general you mostly will only actually see table level locks if you use SERIALIZEABLE isolation.
What is it that you want to accomplish? It's not 100% clear to me from your original question?
Chris

Lame question about Enterprise vs. regular java

ok,
up until now my company has had no need for the Enterprise features, but now we are starting to look to the future and it seems we are going to need a bit of its functionality.
My question is: does Enterprise require a licensing fee for commercial use? Is there any licensing fee at all? what kind of situations is it required in? i googled it and couldn't get a straight answer. thanks.

pnandrus wrote:
buzzword fever. i figured someone would suggest that.
actually, its not buzzword fever. its just that my company uses a client-server model with a heavy
application that resides on the actual ws, but communicates with an app server and a scheduler.
We have some monthly processes that need to be distributed to different app servers from a single server
. I have been writing POJO for 4 years, so i'm just learning about this stuff. However, i felt that i could use EJB in a container to communicate between app servers more easily than trying to implement it using POJO (if that's even possible), or using JNI. I'm new to this, so i was trying to use as little vocab as
possible for fear of being mocked. Good idea.
I don't see how EJB helps you out here.
Anyways, is this an appropriate use of EJB? I'll basically want to be able to start this app up on an app
server, then call methods remotely on other servers that will start the given processes on those machines.
I will add more functionality later. Isn't that an EJB-worthy task? maybe i'm way off....I believe you can do it without EJB.
Curious again - what is your understanding of EJBs, and how do they help you?
SLSB, SFSB, MDB, and entity EBJs - which of the four is appropriate here, in your opinion?
%

Question about the performence of Java Card

Could anyone here tell me how slow running algorithms, like rc4�Ades3 or rsa, on an 8k EEPROM JavaCard?
thanx in advance
rong

Hi:
The performance of javacard is no direct relation with chips. At present most chips is still 8 bit processor. 16 bit processor has more higher price. The reason of running algorithm slow is same as the java applet running on PC platform. Any java and javacard applet must be interpreted by java VM or javacard VM. This way is different from common application windows-based running. This kind application is machine code which can be understanded by hardware directly. But bytecode of java applet is not. It must be translated into machine code by VM. So running speed must slow down. As I konw, some mainstream chip maker is developing javachip. It can run java applet several times faster than software implementation.
Chen Song
Beijing

A question about share interface in java card

I meet a big problem in java card recently.
I try to develop a loyalty and a purse in the JCOP 20 . I use the share interface to share data between two applets.At first I write two small applets to test the share interface.Then I manully dowon the two applets into the card but it doesn't work. The error always happen to the "getAppletShareableInterfaceObject" method.
Following is part of the code.
buffer[0]=(byte)0x06; buffer[1]=(byte)0x05; buffer[2]=(byte)0x04; buffer[3]=(byte)0x03; buffer[4]=(byte)0x02; buffer[5]=(byte)0x01; buffer[6]=(byte)0x01;
//server applet ID
AID loyaltyAID2 = JCSystem.lookupAID(buffer, (short) 0,(byte)7);
if(loyaltyAID2==null) ISOException.throwIt((short)0x0902);
loyaltySIO = (JavaLoyaltyInterface) JCSystem.getAppletShareableInterfaceObject(loyaltyAID2,(byte)0);
//...........................................error happen in this line
I try to find the error I find the error, so I trace to the server applet,I add a "ISOException.throwIt " method in the getShareableInterfaceObject in the server applet.
I find if I add it,the "getAppletShareableInterfaceObject" will return but get the null object.
It's correct.But when I remark the "ISOException.throwIt" and just return "this" ,the card will get "6F00".
Following is my code.
public Shareable getShareableInterfaceObject(AID clientAID,byte parameter)
//ISOException.throwIt((short)0x9999);
return this; } error happen in this line
TKS...

Yes I did do it,I modify the sample code of the SUN micro's loality and purse .Following is my source code.
Client code(purseeasy).......
//=========================
package purseeasy;
import com.sun.javacard.samples.JavaLoyalty.JavaLoyaltyInterface;
import javacard.framework.*;
public class purseeasy extends javacard.framework.Applet
private byte[] echoBytes;
private static final short LENGTH_ECHO_BYTES = 256;
     public purseeasy()
     echoBytes = new byte[LENGTH_ECHO_BYTES];
register();
public static void install(byte[] bArray, short bOffset, byte bLength)
new purseeasy();
public void process(APDU apdu)
byte buffer[] = apdu.getBuffer();
short bytesRead = apdu.setIncomingAndReceive();
short echoOffset = (short)0;
switch(buffer[2])
case 0x31:
AID loyaltyAID1 =JCSystem.getAID();
short i=loyaltyAID1.getBytes(buffer,(short)0);
if(loyaltyAID1==null)
          ISOException.throwIt((short)0x0901);
buffer[0]=(byte)0xd1;buffer[1]=(byte)0x58;
     buffer[2]=(byte)0x00;buffer[3]=(byte)0x00;
     buffer[4]=(byte)0x01;buffer[5]=(byte)0x00;
     buffer[6]=(byte)0x00;buffer[7]=(byte)0x00;
     buffer[8]=(byte)0x00;buffer[9]=(byte)0x00;
     buffer[10]=(byte)0x00;buffer[11]=(byte)0x00;
     buffer[12]=(byte)0x00;buffer[13]=(byte)0x00;
     buffer[14]=(byte)0x31;buffer[15]=(byte)0x00;
     AID loyaltyAID2 = JCSystem.lookupAID(buffer,
(short)0,(byte)16);
if(loyaltyAID2==null)
     ISOException.throwIt((short)0x0902);
     JavaLoyaltyInterface loyaltySIO =
(JavaLoyaltyInterface)
     JCSystem.getAppletShareableInterfaceObject(loyaltyAID2,(byte)1);
if(loyaltySIO ==null)
     ISOException.throwIt((short)0x0903);
loyaltySIO.grantPoints (buffer);
break;
apdu.setOutgoingAndSend((short)0, (short)18);
//=====================================
//Server program....share interface
package com.sun.javacard.samples.JavaLoyalty;
import javacard.framework.Shareable;
public interface JavaLoyaltyInterface extends Shareable
public abstract void grantPoints (byte[] buffer);
//=============================================
//Server program....loyalty
package com.sun.javacard.samples.JavaLoyalty;
import javacard.framework.*;
public class JavaLoyalty extends javacard.framework.Applet     implements JavaLoyaltyInterface
public static void install(byte[] bArray, short bOffset,
byte bLength)
{new JavaLoyalty(bArray, bOffset, bLength);
public JavaLoyalty(byte[] bArray, short bOffset, byte
bLength)
register();
public Shareable getShareableInterfaceObject(AID
clientAID,byte parameter)
return (this);
public void process(APDU apdu)
byte buffer[] = apdu.getBuffer();
short bytesRead = apdu.setIncomingAndReceive();
apdu.setOutgoingAndSend((short)0, (short)18);
public void grantPoints (byte[] buffer)
     buffer[0]=0x08;
     buffer[1]=0x08;
     buffer[2]=0x08;
     buffer[3]=0x08;
     buffer[4]=0x08;
     buffer[5]=0x08;
     buffer[6]=0x08;
     buffer[7]=0x08;
Could you tell me what wrong with my code???
Thanks....

Question about Multiple Entries

We are thinking about signing up for FormsCentral to do a contest (among potentially other things). One important feature to us is that people are only allowed to submit the form one time. Does FormsCentral have the ability to do this? Thanks!

No, limiting submissions from one user is not something FormsCentral supports.
You can embed the from into your own web page that you could control access to where you set up a system only allowing users to log into that page one time, when the user submits the form it could redirect out of that page and then the user would not be able to log into it to fill out the form again. But this would all (except the redirect) be controlled by you and your website.
Thanks,
Josh

Beginer, I have a question about win Xp and java

I dont know where to start, please help. I can give you a list of the tools I have, and would like to know what else I need to start programing and animation. Thanks

It probably would be better to start with some language basics before you get over to animation. But that's up to you, of course.
Anyway, here's what you need:
Tools
* The Java Development Kit (http://java.sun.com/j2se/1.4.1/download.html)
Things to read
* The Java Tutorial (http://java.sun.com/docs/books/tutorial/)
* The API documentation (http://java.sun.com/j2se/1.4.1/docs/api/index.html)
* These forums (http://forum.java.sun.com/)
Kind regards,
Levi

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