HiI am currently investigating the setup we'll need to develop java apps - we're looking to develop multi-tier applications using jsp,servlets and ejb's. We are however currently tied into using Microsoft IIS webservers. From what I can gather we therefore have no choice but to purchase an ...

I feel that while designing a J2EE application, using the Java Data Objects alongwith Entity beans is somewhat redundant. Is it so or there is any reason behind this architecture?

A servlet in WAR_A talk with a browser ,the servlet record some status,such as username,login success or failed.Then,the browser go to another servlet in WAR_B,How can the servlet in WAR_B get the status made by the servlet in WAR_A a moments ago.In some application on web,such as WAR_A work ...

Dear all,I have tried to use the method File.delete() to delete a file. However, when I call this method in my EJB, I got the the exception "access denied [FilePermission abc.txt delete], can I delete a file using EJB in J2EE or use JSP to delete files?Please help me, thank you ...

I have a question as follows:I use a SessionBean to invoke two EntityBean's methods,and i want these two methods in one transaction context. I mean i want them rollback or commit together.for example :Session bean method sessionTest(),invoke EntityBean methods test1()and test2(),if test1() is ...

I have develop a web application follows J2EE design pattern like Front Controller and others in J2EE Petstore Example. I'm not using any EJB,only serlvet , JSP and Javabeans and implement Command Pattern in the framework.It has a entry form and after i submit the form , the controller servlet ...

Hello, I've been developing JSP's and Servlets, and am just getting in to the realm of EJB's... I am writing a data-driven system in which I want to query method names from a DB and invoke them on my Enterprise bean. I've been using a simpler version of the same code (not using the ...

Microsoft is saying they developed the J2EE Pet Store blueprint application using .NET and they claim it took 1/3rd of the code and runs 28 times faster on the same hardware configuration (compared to the same J2EE application running on Oracle 9i). http://www.gotdotnet.com/team/compare/Does Sun ...

Hi all,Could you please help me with a following error?I am trying to start Jakarta-tomcat 4.0:C:\ Jakarta-tomcat 4.0\bin\startup.bat and I receive the error:Catalina.start: LifecycleException: null.open: java.net.BindException: Address already in use: JVM_BindLifecycleException: null.open: ...

Hi all, unfortunatley there is no forum for project management issues, so maybe I will bother some of you with non-technical questions:Is there any learning material e.g. books, forums, newsgroups, tutorials related to the topic of project managment in J2EE-Development? I'm particularly ...

How to earn one?How to spend?Is it possible Duke Dollars -> real dollars?Where to get info about?

Hi:Im trying to monitor resources (memory leak, cpu usage, etc) used by Jakarta Tomcat.I have tried RUE ( http://rue.nolimits.ro) and JInsight ( http://www.alphaworks.ibm.com/tech/jinsight) with no success (I think Jinsight only works for Websphere).Does anyone has been able to monitor Tomcat in ...

Hi Expertises,Any idea to improve my poor code for detecting stale homes... or no way to detect it? I got exception after i restart/re-deploy ejbs.I spent big effort on this issue because it gives me significant benefit on performance.thx/** * This is a utility class for obtaining EJB ...

HELLO ALLI WOULD LIKE TO MINIMIZE A FRAME IN SYSTEM TRAY HOW IT IS POSSIBLE

I would like to Deploy EJB 2.0 specific beans and would like to have a appropriate deployment tool for that purpose latest J2EE SDK available for download now at the following URL: http://java.sun.com/j2ee/j2sdkee-beta/index.html. was not serving the purpose. Does this deployment tool come ...

Hi there,I've got two j2ee applications that are running on two different machines. In application A, some ejbs need to talk to the ejbs living in application B. But I don't know how an EJB can look up another EJB running in another computer?When a stand-alone java app client tries to talk to ...

I have downloaded J2EE and I am trying to get started with it. I got the tutorial and I am using it to start learning how to use J2EE. There is a problem though. I am at the first application, the conversion stuff. I didn't manage to use ant to compile my files, but I did it with javac. ...

The problem is that the Session bean cannot get the chinese character from JSP.I have set<%@ page language="java" contentType="text/html;Big5"%> in JSPwhen I invoke the Session bean by following code/************************************************************InitialContext ctx_forum=new ...

Hi there,answering a question I posted elsewhere, someone pointed me towards the "licensing / copyright method of the Java Community Process". Now I have been scanning the net for some time, but was unable to locate any document exactly describing how the JCP handles licensing / copyright. Can ...

This is probably a simple question but how do I attach a icon(.ico) to a executable. ?Thanks,Mark

should ejbs call other ejbs or should the middle tier control all ejb communication

What is the best way to package classes that are common across separate EJB jar files? IE, i have an object that is passed between the 2, or a utility that is used by both. Is it customary to package the classes within the EJB jar file? This seems silly to me becausenow you have 2 versions of ...

Hello, I need help on a bug on the JInternalFrame that SUN have fixed. I'm using in a my own DesktopPane and my own JInternalFrame in a MDI application. On each JInternalFrame created, I have different listener that is rerferer to this JInternalFrame. When I'm closing the JInternalFrame, I ...

Hi,I want to run different versions of EJBs on the same application server instance. My idea is to have a component which provides access to these EJBs depending on the desired version. The idea behind this is to test different versions of EJBs (e.g. unit testing and integration testing on the ...

I'm going to implement the front controller pattern. As it is implemented in the blueprints (Pet Store), requestmappings.xml and screendefinitions.xml are only read upon start up. Thus, the web application has to be restarted to carry out changes.I'd like the possibility to perform changes to ...

HiWhat is the difference between the Factory and Singleton pattern.Can we use a singleton (pattern) class to create other object instances and return them.What are the advantages and disadvantages for using the Singleton pattern here.Or do we have to use only a factory (pattern) class to do the ...

I have to use job scheduler for creating agent. Is there any J2EE time scheduling API are there for it. I am using Weblogic, in 6.1 Time Services are deprecated. And they are recommeding got FLUX job scheduler.By using FLUX can i be able to deploy my application on any J2EE servers.Is there any ...

Hi,I have to create Agents that perform the job on regular interval. I am going to use JMS for sending results back to the client. My need is to run this scheculed on the weblogic application server. Does any one have createed or have idea how to proceed can give their valuable ...

We wish to connect fat clients (in our case Powerbuilder) to a J2EE environment (Weblogic). We also need to make some of the calls from the fat client non-blocking (asynchronous). With many clients, JMS was rejected as a mechanism.Our first solution, which works as a prototype, was to package a ...

Is there other web site which talks about how to set the environment variable of J2EE for Linux?I followed this web site http://www.dougsparling.com/comp/howto/linux_java.htmlbut after allwhen I tired to compile a servlet program... it couldn't be complied. I think the case is that the compiler ...

I am using local interface to call entity bean from session bean where my business logic resides. Does anyone have an idea as to what will be the effect if I deploy this on a weblogic cluster.

Hi everyone,I have been seeing more examples of calling EJBS from tablibs lately.What advantage does calling EJBS from taglibs have over calling from a servlet?Thanks in advance

If I want to run a J2EE client in a remote machine, what is the minimum configuration I need to have besides installing jdk?Do I need to install j2ee on the machine as well? Or can I getaway with having the client .jar file only?

We are looking for a pattern that would help us with the caching of read-only related data.The type of relationship is 1toMany.For example, for each G/L accounts, I can have many activities and for each activities, I can have many location.Any ideas ?

Serialization/Externalization allows you to exchange java objects in a simple way. It is also possible to internally compress the Output Stream (ObjectOutputStream), but it is very cumbersome and messes up the code. So what I would like to have is a flag in ObjectOutputStream that indicates ...

I am IT guy and I am creating a platform ( a roaming desktop) based on internet environment. Right now I use Novell Server as backend to provide file storage place. My desktop platform just like a graphical terminal and enable the user to bring up this terminal by a browser. That means no ...

At one point in my program, I performing calculations on number of rows(~600,000) from a Flat file of 55Mb. I use JSP & JAVA. Here are some things I noticed.1. It's very slow! :-)2. Initially, the cpu monitor shows a high level of cpu utilisation, but this slowly drops off with a blip ...

Hi Firends, I got problem while running client application[Not Web Client].In J2EE 1.3 Tutorials, they mentioned <runclient> to run the client program.I would like to know what is it <runclient> is it a command or exe file? where is it?thank uSelvan ...

We are using Session Beans, Data Access Objects, and Value Objects in our application (no EBs). A majority of our database tables do not have timestamp columns and we are wondering how others handle stale value objects when timestamps aren't available. Is adding the timestamp column the best ...

Hi all,Here is my problem. I have an object, "MasterObj" for discussion sake, that I instantiate once at start-up, from a file contains a list of properties. The properties are used to set various fields in the MasterObj. During run time, other objects, "Callers", are going to have sessions ...

HOW DO YOU UPLOAD YOUR JAVA APPLICATIONS FROM THE ENVIRONMENT ONTO THE WEBSPACE......DO YOU FTP OR ANOTHER WAY......APPLICATION SERVER?

CAN SOMEONE PLEASE TELL ME HOW TO UPLOAD THE JAVA APPLICATIONS ONTO WEB SPACE CAUSE I DON'T UNDERSTAND .......DO YOU FTP OR ANOTHER WAY OF DOING IT..................

Hi guys,Under unix environement, I have jsdkee1.3 installed and using the deploytool I created the EJB application of the Converter example that is in J2EE tutorial.It worked when the client is on the same machine as the server. Then I took the ConverterAppClient.jar and the ...

I am designing an architecture using JSP/Servlets and Javabeans.Here's what I have:View: JSP only. Controller: ServletModel: Javabeans/Java classes.My question is should I use the Servlet to set up the Javabean and pass it to the JSP as a session object or an attribute of the request object? I ...

Could anyone summarize for me differences between Dispatcher View pattern and Service to Worker pattern? I do not understand them quite well...Thank you

Hi, I have been using the DAO J2EE design pattern for bulk data acces from the database avoiding entity beans,.. But what is happening is that I have factory which creates the instances of DAO's and that factory is used by a Session Facade, I do feel that I can get great benifits of ...

Can you give me a brief overview about singleton.What do you mean by 'a singleton object'/ 'Singleton pattern/Architesture' ? I am confused by the term. It would be helpful if someone can explain about the same.Thanks,

Hi,I want to store a hashtable of info with about five attributes (id, name, username, date) in a persistent state in JSP order to not always call the database. I am either going to use session or request objects.My question is if it's a good idea to store the hashtable with 2000 records just ...

Someone please help me i want to make my verry own chatroom.Without sponcers like bravenet and bassen.How can i do that.Please Help Thanks

hallo all,as i've read in some articles there are common way to represent database entity (a row in the table) by an entyty beans.but, what is an appropriate way to represent a set of rows ? for example - user's shopping cart. i don't like the common way - to implement shopping cart as ...