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Java Forum / JavaBeans / May 2005what should be the architecture !!
hi.. I am developing a Lab management software. Our lab includes certain resources like Switches and routers . We just want to keep track that who all people have reserverd the resources and who are in the queue. I have thought to implement the middle tier in JavaBeans and the frontend in JSP and the Servlets , with the backend being in mySQL. can anybody help me how to build the architecture , and after reading about all these technologies , i still dont understand how do i integrate all these technologies. any help would be appreciable. with regards Gaurav >hi.. > [quoted text clipped - 16 lines] > >Gaurav This sounds like the right approach. There are a number of good web resources out there. Do this google search: java model 2 architecture mvc The JavaWorld article that was at the top is very good (though maybe a bit dated). Eric thank's Eric for replying. should i use EJB instead of BEANS ? is it necessary ? gaurav Are there a lot of transactions in short time, then EJB would be better. If there are only a few transactions, then I think EJB would be overkill. Using DAOs or Hibernate or JDO would be better. Daniel > thank's Eric for replying. > should i use EJB instead of BEANS ? > > is it necessary ? > > gaurav I agree with Daniel - though EJB has several flavors. Sessions beans using DAO/Hibernate/JDO is less overkill than entity beans. And Struts or Spring as a framework would rock. But if Gaurav is a newbie (as it sounds), there's a lot to be said for keeping it simple to begin with. With a good design and minimal coupling, it's not too difficult to utilize other frameworks. Having said that, JBoss/Hibernate makes a great combination. ;-) HTH Eric >Are there a lot of transactions in short time, then EJB would be better. If >there are only a few transactions, then I think EJB would be overkill. Using [quoted text clipped - 8 lines] >> >> gaurav > >> thank's Eric for replying. > >> should i use EJB instead of BEANS ? > >> > >> is it necessary ? > >> > >> gaurav If you are concerned about choosing a simple approach to data persistence I recommend JDBC DAOs and a JSP or Struts/JSP presentation tier. You may find this comparison of the various options (EJB CMP, JDO, etc) useful: http://www.codefutures.com/weblog/corporate/archives/2005/02/data_persistenc.html PJ Murray CodeFutures Software http://www.codefutures.com A good approach is first to design the application without having a concrete implementation system (EJB, JavaBeans) in mind. He shoud think about the usage of the application. How much users are there per hour/minute/second. What users are there. What use cases should be implemented. How much time he has to implement the application. After that he can decide which architecture (EJB, JavaBeans) fits best. >I agree with Daniel - though EJB has several flavors. Sessions beans using > DAO/Hibernate/JDO is less overkill than entity beans. And Struts or Spring [quoted text clipped - 3 lines] > lot to be said for keeping it simple to begin with. With a good design and > minimal coupling, it's not too difficult to utilize other frameworks. If he is a newbie than he should keep it real simple, a DAO layer and Struts are the best to start with. For development he should think about using Ant and XDoclet to generate the configuration files (web.xml and struts-config.xml). For the design pattern DAO is an explanation at the Java homepage under the blueprints section (http://java.sun.com/blueprints/patterns/DAO.html). > Having said that, JBoss/Hibernate makes a great combination. ;-) If the application doesn't need to handle thousands of transactions (reservation of a resource) a minute than I think also a application server is too much. In such a situation I would prefer a web server (tomcat, jetty) and implement the back-end with Hibernate, JDO or an own DAO layer and the front-end with Struts and/or Spring. Daniel > If he is a newbie than he should keep it real simple, a DAO layer and Struts > are the best to start with. For development he should think about using Ant > and XDoclet to generate the configuration files (web.xml and > struts-config.xml). For the design pattern DAO is an explanation at the Java > homepage under the blueprints section > (http://java.sun.com/blueprints/patterns/DAO.html). Daniel's advise about keeping it as simple is true in this case, and worth remembering ... Can I suggest you look at FireStorm/DAO? FireStorm/DAO is a Java Code Generator that can import existing database schemas (from a SQL script or from a live JDBC connection) and can then generate a complete DAO persistence tier and Struts JSP presentation tier. You can read about FireStorm/DAO here: http://www.codefutures.com/products/firestorm/ You can read about DAOs here: http://www.codefutures.com/data-access-object/ hey thanx everybody . that has been a overwhelming responce. Thanx once again yeah , just to make clear i am a newbie . my application would not be handling many transcations per minute . may be just 10-20 max per minute would be good enough . I have decided to use mySQL as the database and i am using the Tomcat as the webserver . front end would be made in JSP and servlet. i am follwoing the model 2 architecture of MVC. i have to finish this project by april end and i am also learning these new technologies side by side. what you people can suggest me to do more in this time frame of 1 month , so i can make my project look and feel THE BEST . thanx again for all you people out there , helping me. regards Gaurav > hey thanx everybody . that has been a overwhelming responce. Thanx once > again [quoted text clipped - 13 lines] > what you people can suggest me to do more in this time frame of 1 month > , so i can make my project look and feel THE BEST . Not much time :-(. Because you want to implement it as MVC model 2 architecture you should use Struts and a DAO layer. Make each use case as an Struts Actions and the domain objects as Struts ActionForms. The DAO layer should also work with the ActionForm. So far this couples the backend (DAO layer) with the frontend (Struts) but you will save a lot of time. Later if someone had to extend the application he can extract the domain model from the ActionForms and decouple backend and frontend. The time can be used to implement the frontend and make the project look best ;-). Daniel I agree with Daniel's suggested architecture Not just because it's a simple architecture, but also its a sustainable architecture, following DAO and MVC patterns. Since its your first project, I probably would have recommended this architecture even if you had more time to look at more complex options. And the good news is that you can easily get this project done in the time available - once you have the data model/database schema, you can generate all the DAO and Struts code. This will allow you to concentrate on solving the business problem rather than learning DAOs and Struts. You can take a quick look at a tutorial here: http://www.codefutures.com/products/firestorm/tutorial/ Note that FireStorm/DAO has many DAO code generation options: we're suggestion here that you go with a straight JDBC DAO data integration tier and Struts presentation tier. Ignore the temptation to look at options like EJB CMP or JDO. now this 'Firestrom' is a paid software and i cant use it , because i am supposed to use any thing that is free :-( can I , please get a example code which makes me understand how to integrate struts,JSP, servlets, beans and the DAO. ? i am gettin notes for all these as different entities and not as a whole thing combined. therefore it is becoming very difficult for me, to think about the bigger picture. if somebody have some example codes which contains all these technolgies, it would help me a lot. regards Download Struts from their homepage (http://struts.apache.org) and look at the sample applications. A typical use case in your application could be the reservation of an existing resource. For this the user must go to a webpage and submit a filled form. Then maybe he gets a reservation mail or something else. When the resource is available he should also get a mail. How could this be realized on a Java webserver with Struts, JSP, Servlets and a DAO layer? The user also opens his browser and navigates to a specific URL. The web server than displays the JSP file under the given URL. On this web page exists a HTML form that must be filled and a submit button to send the data from the form to the web server. The form path gets mapped to a Struts Action. How goes this? At first Struts uses a single Servlet that acts as a controller and all requests gone through this Servlet get mapped to specific Struts Actions. It is also responsible for populating a Struts ActionForm with the data from the request. After the Servlet has populated the Struts ActionForm and found the Struts Action. It calls the execute method on that Struts Action. Here comes your code. In the Struts Action you use the Struts ActionForm to retrieve the data the user has made in the web page. And you use your DAO to communicate with the database. For this use case you use the data to add the reservation to the database. The DAO executes the insert statement to create a new row in the database. A web application is configured in the file web.xml the Struts framework is configured in a file called struts-config.xml. The Struts Servlet is also configured in the file web.xml. The web server loads the web application and the configuration from the file web.xml. There the Struts Servlet is configured and loads the file struts-config.xml. In this file all Struts Actions and ActionForms are configured. Daniel > can I , please get a example code which makes me understand how to > integrate struts,JSP, servlets, beans and the DAO. ? [quoted text clipped - 7 lines] > > regards Hi Gaurav, I sort of guessed you were a student or something similar. Why don't you download FireStorm/DAO and try it out? http://www.codefutures.com/products/firestorm/download/ I'll look out for your download and arrange a free license for the duration of your project. If you're learning Java, then you may as well learn to do things the right way. The code generated by FireStorm/DAO is based on the Core J2EE Design Patterns (not just data access objects, but also data transfer objects, session facades, business delegates, etc). Regads PJ Murray Hi Gaurav, I sort of guessed you were a student or something similar. Why don't you download FireStorm/DAO and try it out? http://www.codefutures.com/products/firestorm/download/ I'll look out for your download and arrange a free license for the duration of your project. If you're learning Java, then you may as well learn to do things the right way. The code generated by FireStorm/DAO is based on the Core J2EE Design Patterns (not just data access objects, but also data transfer objects, session facades, business delegates, etc). Regards PJ Murray hi Murray, Thanx for your kind consideration. I would certainly try FireStrom. and yeah i am a student and my project work is for 4 months, so i am trying my level best to figure out these complex design patterns. and J2EE. actually i tried a software called "DB Architect" which auto generated the DAO classes for me. i kinnda liked it. Is your software too, does the same thing ? regards Gaurav is there any good GUI tool in JAVA / JSP which can help me make fantastic front end (web page ) in JSP and HTML. ? it probably should have drag and drop facilties like the one Microsoft Visual studio for .NET has !! is there any other software , which can help me make frontends in JSP/ JAVA with drag and drop capabilties like Microsoft Visual Studio for .NET i mean that, with the help of that software we can easily make frontends and that too visaully appealing one. regards Gaurav Hi Gaurav, I sort of guessed you were a student or something similar. Why don't you download FireStorm/DAO and try it out? http://www.codefutures.com/products/firestorm/download/ I'll look out for your download and arrange a free license for the duration of your project. If you're learning Java, then you may as well learn to do things the right way. The code generated by FireStorm/DAO is based on the Core J2EE Design Patterns (not just data access objects, but also data transfer objects, session facades, business delegates, etc). Regards PJ Murray well, nobody has answered. :-( .. neways , i was thnking to make GUI in swings which would be embedded in the JSP page. wht do you people say ? If i could have found out a good GUI software , that would have reasonbaly helped ! regards gaurav can anybody do let me know, if there is some HTML editor exactly like FRONTPAGE ? As in Office XP, there is no FRONTPAGE :-( Macromedia Dreamweaver Commercial, with good HTML and Taglib support (MX version). Why do you need Drag&Drop? For tables, Database connections or what? Daniel > can anybody do let me know, if there is some HTML editor exactly like > FRONTPAGE ? > As in Office XP, there is no FRONTPAGE :-( kwell...yeah that drag and drop option was wrong. i think a good HTML editor should serve my purpose to make a good front end hi everybody !! I am back, and my project is goin fine... Just stepped into more deep waters !! I have a page where I have three combo boxes. Each combo box would be filled up by three different database queries. Now , the requirement is , that when I fill my first Combo Box from the database, and as soon as the user chooses one option from the 1st Combo Box , the 2nd Combo Box should use the values of 1st Combo Box and run an datbase query depending on the value choosed in 1st Combo Box and display it. In ,NET we make this possible by " run at = server" . but I am really not getting an idea, how to do this specific job in J2EE. hope to get help from you people, as in past ! regards, Gaurav Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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