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  • work question how to start working as a programmer what do i need!

    - by giorgo
    Hi i am learning java and php i have some projects from uni.(Gui,s in java with mysql and a web application in php with mysql ++ more things like this.) i have started learning mvc struts spring and i also lerning php +zend +++++ more stuff etc....you can't learn everything!!!!!!!!!!!!!!!!!!!!!!! I would like to ask how can i find a job as a programmer-software eng because i have send my cv in many companys but all of them said me that i need work expirience. How All of you started your programming expirience. Did you make some projects and send them did you you have somebody that help you ...??? i am totaly alone i do everything by my self. can anyone answer this?everybody starts from somewhere but what if this somewhere don't come?what to do ?? how to start !!!!!!! Thanks

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  • How to step into the world of J2EE?

    - by Michael Lai
    I am new to J2ee. I have experience in Java core, JSP,Servlet, XML, HTML, What should i learn to step into the world of J2EE? Framework(Spring, Hibernate, Struts)? But the framework is too abstract for me.I saw lots of job post which requires frameworks, some jobs require EJB,JPA. I do not where to start. Any experts can give me hints on that? I found the tutorial of J2EE 5 published by ORACLE is not easy to understand. Too much jargon....

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  • lookup datasource in context every time, Is it right?

    - by Srikanth Dyapa
    In my application i configured more than one datasource (for diff databases). Whenever user sends a request depends upon user category i need to look up for the respective datasource in the context and get a connection from that datasource to execute queries which are assigned to that user. Is it right way to achieve my requirement? I am using tomcat 6, struts 1.3. The databases may be oracle or mysql or both. Give me an optimized solution. Thanks in advance.

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  • How do I get artifacts from one Maven module included in the resources of another in my build?

    - by Hanno Fietz
    I have Maven modules that produce a Flex application as an SWF file. I want to include that file in a web application that is made with another Maven module from the same build. I'm wondering how and at which lifecycle phase I get Maven to grab the artifact from the other module and put it insode the appropriate folder of the webapp module. Would I use a separate assembly module? The web app is running on a Jetty server in an OSGi environment (using Pax), the server side of the web app uses Struts. The final artifact as I see it would be a WAR file including my Action etc classes, JSP templates, static contents such as CSS or JS, and the SWF movies. I might be better off with these split over some other setup, but right now, I wouldn't know which.

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  • What makes Groovy+Grails a more productive setup than J2EE?

    - by Pradyumna
    I'm coming across references to 'Grails' and 'Groovy' quite often these days.. mostly on how great a productivity booster it is as opposed to standard J2EE, or things like JSF, Struts etc.. And there's also an impressive set of case studies in support of this on their web site too. So I just thought I would explore some of it.. As I start off on this, I was curious if there was any material (link, blog, article, paper..) that explains what are the special features in Grails+Groovy (and not found elsewhere, in the J2EE world) that makes it a more productive environment to work in? Thanks!

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  • Label field problem in the treenode Tag. (Struts2/Ajax)

    - by ryan
    I'm using struts as a framework for a web-app. The following code runs inside a loop where I access the database to retrieve values to be used as nodes for a tree. <s:set name="categoryValue" value= "%{'<%=rs.getString("category")%>'}"> </s:set> <sx:treenode id="child1" label ="%{#categoryValue}"/> The error I get is "/jsp/tree.jsp(249,65) equal symbol expected" However if i give <s:set name="categoryValue" value= "%{'Test'}"> the value Test is obtained. Can anyone tell me how to set the value of the 'label' with strings?

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  • ??????????????JSF2????Web????????????Java Developers Workshop 2012 Summer????

    - by ???02
    ???WebLogic Server 12c?????Java EE 6????1???Web??????????????????????JavaServer Faces 2(JSF2)????????????????????????????????????????8???????Java Developers Workshop 2012 Summer??????????????????Java?????????????(Fusion Middleware????????)????????????????(???) JSF2??10?????AJAX??Web?????????????? ?????? Fusion Middleware???????? ???Java?????????????? Java EE 6????Web?????????????·????????????JSF2??Struts???Java EE???????Web????????·????????????????????????????????????????JSF2????????????Web??????????????UI??????????????????????????? ??????????Java EE?????????????????????????????????Java EE 6?JSF2??????????????????“????????”?????????????Java EE 6???????????????????????JSF2????????·???????????????????????????????????????????????????????? ??????????????GlassFish????????NetBeans???????????????????????????????????????11??????????????????????????????????????????(???)???? ???????????????????Web?????????????????????????????????????????????????????????????? ????AJAX???????????????????????????????????????????????????·????????????????????????? ????????????????NetBeans???????????????????????????????????????????????????·?????????????????????????????????????????????? ???????????????????????JSF2?????????AJAX???????????·??????????????????????????????????????????????????????????????Web????????????????????AJAX????????????JSF???????????1?????????? ?Java EE????????????????????????????Java EE 6??AJAX??????????????????????????????????????XML???????????NetBeans?????IDE???????????????????????????????????(???) ???????·?????????????????????? JSF 2????????????????????????Web??????(?????)?????????????????????????????3???????????? ??????????Visual Basic?JavaFX?????????????·????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? JSF2???MVC??????HTTP???????????????????Controller???Faces Servlet?????View?????XHTML??????Model?????Managed Bean????????????? ?????View???????????JavaServer Pages(JSP)?????????????????????XHTML????????????????View???????????????????????JSP????Scriptlet???????????????????????????????????????????????????? JSF2???View?Model??????????????????????????????????????????????????????????? ?????????JSF2????????1???HTML???Web????????????????????????JSF???Web????????????????????????????????????????HTML????????????????????????HTML 4.0?DHTML???????????????????????JavaScript??????????????????????JavaScript???????????Web?????????resources???????????????????????JSF2?????????????????Web??????????????? ????????????????????????????????????????????????·???????Web?????????????????????????????????????? ?????????????????????????????????????????????????????????????????????????? ????JSF???????????????????????????????????????????? ????JSP?????????????????????????????????????????????????????HTML????Web??????????????????????????????????JSP?Web???????????????????????????????????????????????????XHTML????JSF????????View???JSF2?????????????????????????????????????/??????????? JSF???????????????? ????????????????????????JSF?????????????????????????????????JSF2????????????????????????????????????? Web?????????????????XHTML????????JSF?Facelets?Web???(View)???UIComponent?????????? ??View?????????????????????????????View(UIComponent???)?????? ??????View?????????????????????? ???????????????Bean Validation????????????????????? ???JSF2??@FacesValidator??????????????????????????????????????????????????Validator?implements??????validate????????????????????????????????????????????????? ????????????????Model?POJO????????????????ManagedBean?JPA Entity?????????Value?????????????????????????Component??????????????????Component?????????????????1????????????????????????????????????????????? JSF2??????????????????JSF 1.2???????????·????XML?????????????????JSF2?????????????????????????????????????????????????????????? ???JSF???Web?????????????????????ManagedBean?CDI(Contexts and Dependency Injection)???POJO????????????????????????????????????????????????????????????????????????ManagedBean???????????????????????????????????????????????????????????????????????? ??????????????????????JSF???????????????????????????????????????JSF2??????????????????????????????????????????????? ????????????????JSF?Web??????????????????????????????????????·????????????????????????????JSF????????????????????????????????????????????????????????????????

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  • ?????Java EE??????????(?3?:EJB&CDI??)??!

    - by Masa Sasaki
    WebLogic Server?????????????WebLogic Server???????? 2014?8?27?? ??49?WebLogic Server???@??????????? ????????????????Java EE???????????????(?4?)? ??3? EJB&CDI?????? EJB(Enterprise JavaBeans)???????????????????????????????????? EJB???????????????????????????? ??????????????????Bean??????????????????? ?????????????????? ??1? Java EE&WebLogic Server???(5?27?)? ??2? JSF???(6?24?)?????2????????????? ????????????????????Java?????????Java EE????!???? ????????????????????? (?????? Fusion Middleware?????? ??? ??) ??49?WebLogic Server???@???????????? 2014?8?27?? ??49?WebLogic Server???@??????????? ?????????????????????????????????? ??????Java EE??????????????: ?3?EJB&CDI??? EJB (Enterprise JavaBeans)?????????????????????????? ??????????EJB???????????????????????????? ??????????????????Bean??????????????????? ?????? ??????????? ?? ?? ???Java?????????Java EE????!? ??????????Struts???????????·?????????????? Java?????????Java EE????????????????????????? ???????????????????????????????????Java EE ????????????????? ?????? ?????????????????? ??? ?? ????????Q&A? ?WebLogic Server?????????????????????? (???)WebLogic Server?????? ????????8?27?(?) ???????????????7?00?????? ??????????????? (???WebLogic Server?????) ?????? WebLogic Server??? WebLogic Server?????????WebLogic Server???? ?! WebLogic Server??????(???????????) WebLogic Server???????? WebLogic Server??????

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  • HTTP status 405 - HTTP method POST is not supported by this URL

    - by Wont Say
    I am getting this "HTTP method POST is not supported by this URL" error when I run my project. The funny thing is, it was running perfectly fine two days ago. After I made a few changes to my code but then restored my original code and its giving me this error. Could you please help me? Here is my index.html: <form method="post" action="login.do"> <div> <table> <tr><td>Username: </td><td><input type="text" name="e_name"/> </td> </tr> <tr><td> Password: </td><td><input type="password" name="e_pass"/> </td> </tr> <tr><td></td><td><input type="submit" name ="e_submit" value="Submit"/> Here is my Login servlet: public class Login extends HttpServlet { /** * Processes requests for both HTTP * <code>GET</code> and * <code>POST</code> methods. * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException, SQLException { response.setContentType("text/html;charset=UTF-8"); PrintWriter out = response.getWriter(); try { /* * TODO output your page here. You may use following sample code. */ int status; String submit = request.getParameter("e_submit"); String submit2 = request.getParameter("a_submit"); out.println("Here1"); String e_name = request.getParameter("e_name"); String e_password = request.getParameter("e_pass"); String a_name = request.getParameter("a_name"); String a_password = request.getParameter("a_pass"); out.println(e_name+e_password+a_name+a_password); Author author = new Author(a_name,a_password); Editor editor = new Editor(e_name,e_password); // If it is an AUTHOR login: if(submit==null){ status = author.login(author); out.println("Author Login"); //Incorrect login details if(status==0) { out.println("Incorrect"); RequestDispatcher view = request.getRequestDispatcher("index_F.html"); view.forward(request, response); } //Correct login details --- AUTHOR else { out.println("Correct login details"); HttpSession session = request.getSession(); session.setAttribute(a_name, "a_name"); RequestDispatcher view = request.getRequestDispatcher("index_S.jsp"); view.forward(request, response); } } //If it is an EDITOR login else if (submit2==null){ status = editor.login(editor); //Incorrect login details if(status==0) { RequestDispatcher view = request.getRequestDispatcher("index_F.html"); view.forward(request, response); } //Correct login details --- EDITOR else { out.println("correct"); HttpSession session = request.getSession(); session.setAttribute(e_name, "e_name"); session.setAttribute(e_password, "e_pass"); RequestDispatcher view = request.getRequestDispatcher("index_S_1.html"); view.forward(request, response); } } out.println("</body>"); out.println("</html>"); } finally { out.close(); } } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { super.doPost(req, resp); } @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { super.doGet(req, resp); }} And my web.xml looks like this: <?xml version="1.0" encoding="UTF-8"?> <servlet> <servlet-name>action</servlet-name> <servlet-class>org.apache.struts.action.ActionServlet</servlet-class> <init-param> <param-name>config</param-name> <param-value>/WEB-INF/struts-config.xml</param-value> </init-param> <init-param> <param-name>debug</param-name> <param-value>2</param-value> </init-param> <init-param> <param-name>detail</param-name> <param-value>2</param-value> </init-param> <load-on-startup>2</load-on-startup> </servlet> <servlet> <servlet-name>Login</servlet-name> <servlet-class>controller.Login</servlet-class> </servlet> <servlet-mapping> <servlet-name>action</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>Login</servlet-name> <url-pattern>/login.do</url-pattern> </servlet-mapping> <session-config> <session-timeout> 30 </session-timeout> </session-config> <welcome-file-list> <welcome-file>index.html</welcome-file> </welcome-file-list> I use Glassfish v3 server - let me know anything else you need to know

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  • jstl code issue

    - by theJava
    <%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <%@ taglib uri="http://www.springframework.org/tags/form" prefix="form"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"%> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <style type="text/css"> .even { background-color: silver; } </style> <title>Registration Page</title> </head> <body> <form:form action="add.htm" commandName="user"> <table> <tr> <td>User Name :</td> <td><form:input path="name" /></td> </tr> <tr> <td>Password :</td> <td><form:password path="password" /></td> </tr> <tr> <td>Gender :</td> <td><form:radiobutton path="gender" value="M" label="M" /> <form:radiobutton path="gender" value="F" label="F" /></td> </tr> <tr> <td>Country :</td> <td><form:select path="country"> <form:option value="0" label="Select" /> <form:option value="India" label="India" /> <form:option value="USA" label="USA" /> <form:option value="UK" label="UK" /> </form:select></td> </tr> <tr> <td>About you :</td> <td><form:textarea path="aboutYou" /></td> </tr> <tr> <td>Community :</td> <td><form:checkbox path="community" value="Spring" label="Spring" /> <form:checkbox path="community" value="Hibernate" label="Hibernate" /> <form:checkbox path="community" value="Struts" label="Struts" /></td> </tr> <tr> <td></td> <td><form:checkbox path="mailingList" label="Would you like to join our mailinglist?" /></td> </tr> <tr> <td colspan="2"><input type="submit" value="Register"></td> </tr> </table> </form:form> <c:if test="${fn:length(userList) > 0}"> <table cellpadding="5"> <tr class="even"> <th>Name</th> <th>Gender</th> <th>Country</th> <th>About You</th> </tr> <c:forEach items="${userList}" var="user" varStatus="status"> <tr class="<c:if test="${status.count % 2 == 0}">even</c:if>"> <td>${user.name}</td> <td>${user.gender}</td> <td>${user.country}</td> <td>${user.aboutYou}</td> </tr> </c:forEach> </table> </c:if> </body> </html> When i execute my jsp page, this piece of code does not show up at all. The full source code is below. <c:if test="${fn:length(userList) > 0}"> <table cellpadding="5"> <tr class="even"> <th>Name</th> <th>Gender</th> <th>Country</th> <th>About You</th> </tr> <c:forEach items="${userList}" var="user" varStatus="status"> <tr class="<c:if test="${status.count % 2 == 0}">even</c:if>"> <td>${user.name}</td> <td>${user.gender}</td> <td>${user.country}</td> <td>${user.aboutYou}</td> </tr> </c:forEach> </table> </c:if>

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  • ASP.NET MVC for the php/asp noob

    - by dotjosh
    I was talking to a friend today, who's foremost a php developer, about his thoughts on Umbraco and he said "Well they're apparently working feverishly on the new version of Umbraco, which will be MVC... which i still don't know what that means, but I know you like it." I ended up giving him a ground up explanation of ASP.NET MVC, so I'm posting this so he can link this to his friends and for anyone else who finds it useful.  The whole goal was to be as simple as possible, not being focused on proper syntax. Model-View-Controller (or MVC) is just a pattern that is used for handling UI interaction with your backend.  In a typical web app, you can imagine the *M*odel as your database model, the *V*iew as your HTML page, and the *C*ontroller as the class inbetween.  MVC handles your web request different than your typical php/asp app.In your php/asp app, your url maps directly to a php/asp file that contains html, mixed with database access code and redirects.In an MVC app, your url route is mapped to a method on a class (the controller).  The body of this method can do some database access and THEN decide which *V*iew (html/aspx page) should be displayed;  putting the controller in charge and not the view... a clear seperation of concerns that provides better reusibility and generally promotes cleaner code. Mysite.com, a quick example:Let's say you hit the following url in your application: http://www.mysite.com/Product/ShowItem?Id=4 To avoid tedious configuration, MVC uses a lot of conventions by default. For instance, the above url in your app would automatically make MVC search for a .net class with the name "Product" and a method named "ShowItem" based on the pattern of the url.  So if you name things properly, your method would automatically be called when you entered the above url.  Additionally, it would automatically map/hydrate the "int id" parameter that was in your querystring, matched by name.Product.cspublic class Product : Controller{    public ViewResult ShowItem(int id)    {        return View();    }} From this point you can write the code in the body of this method to do some database access and then pass a "bag" (also known as the ViewData) of data to your chosen *V*iew (html page) to use for display.  The view(html) ONLY needs to be worried about displaying the flattened data that it's been given in the best way it can;  this allows the view to be reused throughout your application as *just* a view, and not be coupled to HOW the data for that view get's loaded.. Product.cspublic class Product : Controller{    public ViewResult ShowItem(int id)    {        var database = new Database();        var item = database.GetItem(id);        ViewData["TheItem"] = item;        return View();    }} Again by convention, since the class' method name is "ShowItem", it'll search for a view named "ShowItem.aspx" by default, and pass the ViewData bag to it to use. ShowItem.aspx<html>     <body>      <%        var item =(Item)ViewData["TheItem"]       %>       <h1><%= item.FullProductName %></h1>     </body></html> BUT WAIT! WHY DOES MICROSOFT HAVE TO DO THINGS SO DIFFERENTLY!?They aren't... here are some other frameworks you may have heard of that use the same pattern in a their own way: Ruby On Rails Grails Spring MVC Struts Django    

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  • JQuery Ajax error handling, show custom exception messages

    Hey Folks, I am wondering if there is some way where I can show custom exception messages as an alert in my Jquery ajax error message. For example, say if I want to throw an exception in server side via Struts by "throw new ApplicationException("User name already exists");", I want to catch this message(User name already exists) in Jquery ajax error message. jQuery("#save").click(function(){ if(jQuery('#form').jVal()){ jQuery.ajax({ type: "POST", url: "saveuser.do", dataType:"html", data:"userId="+encodeURIComponent(trim(document.forms[0].userId.value)), success:function(response){ jQuery("#usergrid").trigger("reloadGrid"); clear(); alert("Details saved successfully!!!"); }, error:function (xhr, ajaxOptions, thrownError){ alert(xhr.status); alert(thrownError); } }); } } ); On the second alert where I alert thrown error, I am getting undefined and the status code is 500. I am not sure where I am going wrong. Please let me know on this. Thanks, Dukes

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  • Web-based clients vs thick/rich clients?

    - by rudolfv
    My company is a software solutions provider to a major telecommunications company. The environment is currently IBM WebSphere-based with front-end IBM Portal servers talking to a cluster of back-end WebSphere Application Servers providing EJB services. Some of the portlets use our own home-grown MVC-pattern and some are written in JSF. Recently we did a proof-of-concept rich/thick-client application that communicates directly with the EJB's on the back-end servers. It was written in NetBeans Platform and uses the WebSphere application client library to establish communication with the EJB's. The really painful bit was getting the client to use secure JAAS/SSL communications. But, after that was resolved, we've found that the rich client has a number of advantages over the web-based portal client applications we've become accustomed to: Enormous performance advantage (CORBA vs. HTTP, cut out the Portal Server middle man) Development is simplified and faster due to use of NetBeans' visual designer and Swing's generally robust architecture The debug cycle is shortened by not having to deploy your client application to a test server No mishmash of technologies as with web-based development (Struts, JSF, JQuery, HTML, JSTL etc., etc.) After enduring the pain of web-based development (even JSF) for a while now, I've come to the following conclusion: Rich clients aren't right for every situation, but when you're developing an in-house intranet-based solution, then you'd be crazy not to consider NetBeans Platform or Eclipse RCP. Any comments/experiences with rich clients vs. web clients?

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  • What java web framework best accomodates web ui designers?

    - by Brian Laframboise
    What Java web framework out there best supports a role of "web UI designer", that is, lets you: Use popular web design tools (xhtml validators, css editors, what have you) on your views/pages View changes without running on a server Rapidly prototype different UI options Supports a (somewhatly) clean separation between "developer" and "designer" (terminology intentionally vague) We, like many others, have found these capabilities sorely lacking in our large, legacy Struts 1.x apps that use lots of JSP fragments and includes. We've decided to port our apps to a JSR-168/268 portal environment, but we have not decided on what Java web framework will power the portlets. We're open to any kind (action-based, component-based, etc) and a key criterion is how well it supports the role described above. I'm intrigued by Tapestry which claims that its views are XHTML compliant pages (that simply have extra Tapestry-specific attributes added onto them to be processed at runtime). This sounds like it would play well with a web ui designer's toolkit. However, I'd like to know if this is what actually happens in the real world, or if compromises are necessary. Of course, if there's something much better than Tapestry, I'd love to hear about it!

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  • Java & Maven generating -and using- my own archetype

    - by Random
    Hello again! I have been busy in my project creating a webapp (in struts) that manages maven, using maven-2.2.1-uber.jar link text. The problem comes when the boss says it has to use some archetypes the company has created (so no predefined archetypes for you naughty boy!). So ok, I use the -DarchetypeRepository option (with ServletWrapper I get my complete web direction, becouse the repository will be inside the app), and the log seems to find it, but then the build fails -miserably- with this little text 'Build Failure - The defined artifact is not an archetype' as simple as that. Of course I have a lot of INFO lines that say abslutily nothig related. I have read the maven definitive guide searching for some kind of help, but it has been disapointing at best. My thoughts are thatmaybe I am missing in somewhere of all the folders tree some xml that actually sais maven that my pom.xml is an archetype not a project. But I really, really, can't find anything on the net or in the manuals that explains easy-handed how the archetype:generate (with special parameters) works and where I have to put every folder and/or file. So just to say my thoughts aloud (and hopefully you understand what I am trying to ask): I have a template where I do some xml changes (variables, etc...), then I have to call maen and do an archetype:generate with a variable project. The problem seems to be that my actual confuguration doesn't like what I am doing. After the generation of the archetype, witch luckly will create some directory trees and leave me a POM.xml somewhere I still have to do some variable changes and more xml manage stuff, so it whould be very kind from maven to don't destroy anything in this process. Any ideas why this maven-thing is not happly-ever-after asuming that my archetype is defintly an archetype? Allthought I think the code is ok, it could be wrong, as I am using maven-ubber and I call the actual CSMavenCli.main(String[, ClassWorld), I don't think it is the case this time. Thanks and all! :) Random.

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  • How do I lookup a JNDI Datasource from outside a web container?

    - by masotime
    I have the following environment set up: Java 1.5 Sun Application Server 8.2 Oracle 10 XE Struts 2 Hibernate I'm interested to know how I can write code for a Java client (i.e. outside of a web application) that can reference the JNDI datasource provided by the application server. The ports for the Sun Application Server are all at their defaults. There is a JNDI datasource named jdbc/xxxx in the server configuration, but I noticed that the Hibernate configuration for the web application uses the name java:comp/env/jdbc/xxxx instead. Most of the examples I've seen so far involve code like Context ctx = new InitialContext(); ctx.lookup("jdbc/xxxx"); But it seems I'm either using the wrong JNDI name, or I need to configure a jndi.properties or other configuration file to correctly point to a listener? I have appserv-rt.jar from the Sun Application Server which has a jndi.properties inside of it, but it does not seem to help. There's a similar question here, but it doesn't give any code / refers to having iBatis obtain the JNDI Datasource automatically: http://stackoverflow.com/questions/39053/accessing-datasource-from-outside-a-web-container-through-jndi

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  • Updating Multiple Drop-Down Lists in AjaxTags

    - by Berin
    I'm using AjaxTags as a defined set of JSP tags to facilitate AJAX programming, saving me from some heavy lifting. The project is in trial mode, so I may not adopt the technology and write my own solution. Here's what I'm running into (code abbreviated) I have a drop-down list that defines an item that populates numerous other drop-down lists. <form> ... <select id="item1" name="item1"> <c:forEach items="${list1}" var="item"> <option value="${item}">${item}</option> </c:forEach> </select> <select id="item2" name="items2"></select> <select id="item3" name="items3"></select> ... </form> <ajax:select source="item1" target="item2" baseUrl="${pageContext.request.contextPath}/doAction.view" parameters="action1 = {item}" /> <ajax:select source="item1" target="item3" baseUrl="${pageContext.request.contextPath}/doAction.view" parameters="action2 = {item}" /> The code above works with my back-end, initiating a call to a servlet class that is listening for calls, parses the parameter and takes action based upon the name of the parameter passed. The problem comes from adding the second ajax:select tag above. An action in drop-down "item 1" only causes "item 3" to be populated with new values. What I want is for an action in "item 1" to populate "item 2" and "item 3" (and 4, 5, 6...). Has anyone else used AjaxTags (ajaxtags.sourceforge.net) and solved a similar solution? Environment Details: Tomcat 5.5.27, Spring 2.0.8, Struts 1.2.9, Java 6

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  • Which java technology should i use , if i want to build website with thousands of users

    - by Mirage
    Sorry for asking this question but i searched all java realted question but i got more confused. I am still not clear what should i start with 1)My main is build website in Java because someone told me that there are some machine learning or AI libraries available in java which i can use in java. so i decided to use that as it can reduce my work. Now i don't know java at all some people say following are used to build websites like 1)Servelts alone can build webiste 2)JSP alone can also build webiste 3)Struts 4)Spring with Hibernate 5)SEAM 6)JEE also for webistes Now guys i am confused where should i start from. Where does core JAVA fits in here. i was thinking of perhaps learning python as i know i have to learn Python only not its variations SO please guide me one thing which can solve my basic purpose of using ready made libraries of AI If i can do that with JSP then i will start with that. But i need to learn all of them then its better if can start learning python. I have 5 months to finish webiste. I really don't know why there are many braches of java for doing one thing Please help me.

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  • eclipse helios tomcat error

    - by itsraja
    Hi, I just created a struts application in eclipse Helios. when I run as server I get an alert like this. My browser is online only. This document cannot be displayed while offline. To go online, uncheck Work Offline from the File menu. and this is error displayed. Dec 23, 2010 7:20:37 PM org.apache.catalina.core.AprLifecycleListener init SEVERE: An incompatible version 1.1.15 of the APR based Apache Tomcat Native library is installed, while Tomcat requires version 1.1.17 Dec 23, 2010 7:20:37 PM org.apache.tomcat.util.digester.SetPropertiesRule begin WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:StrutsHelloWorld' did not find a matching property. Dec 23, 2010 7:20:37 PM org.apache.coyote.http11.Http11Protocol init INFO: Initializing Coyote HTTP/1.1 on http-8080 Dec 23, 2010 7:20:37 PM org.apache.catalina.startup.Catalina load INFO: Initialization processed in 1081 ms Dec 23, 2010 7:20:37 PM org.apache.catalina.core.StandardService start INFO: Starting service Catalina Dec 23, 2010 7:20:37 PM org.apache.catalina.core.StandardEngine start INFO: Starting Servlet Engine: Apache Tomcat/6.0.29 Dec 23, 2010 7:20:38 PM org.apache.catalina.core.StandardContext filterStart SEVERE: Exception starting filter struts2 java.lang.ClassNotFoundException: org.apache.struts2.dispatcher.FileDispatcher at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1645) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491) at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:269) at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:422) at org.apache.catalina.core.ApplicationFilterConfig.(ApplicationFilterConfig.java:115) at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4001) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4651) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045) at org.apache.catalina.core.StandardHost.start(StandardHost.java:785) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:445) at org.apache.catalina.core.StandardService.start(StandardService.java:519) at org.apache.catalina.core.StandardServer.start(StandardServer.java:710) at org.apache.catalina.startup.Catalina.start(Catalina.java:581) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414) Dec 23, 2010 7:20:38 PM org.apache.catalina.core.StandardContext start SEVERE: Error filterStart Dec 23, 2010 7:20:38 PM org.apache.catalina.core.StandardContext start SEVERE: Context [/StrutsHelloWorld] startup failed due to previous errors Thanks.

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  • JDBC transaction dead-lock solution required?

    - by user49767
    It's a scenario described my friend and challenged to find solution. He is using Oracle database and JDBC connection with read committed as transaction isolation level. In one of the transaction, he updates a record and executes selects statement and commits the transaction. when everything happening within single thread, things are fine. But when multiple requests are handled, dead-lock happens. Thread-A updates a record. Thread B updates another record. Thread-A issues select statement and waits for Thread-B's transaction to complete the commit operation. Thread-B issues select statement and waits for Thread-A's transaction to complete the commit operation. Now above causes dead-lock. Since they use command pattern, the base framework allows to issue commit only once (at the end of all the db operation), so they are unable to issue commit immediately after select statement. My argument was Thread-A supposed to select all the records which are committed and hence should not be issue. But he said that Thread-A will surely wait till Thread-B commits the record. is that true? What are all the ways, to avoid the above issue? is it possible to change isolation-level? (without changing underlying java framework) Little information about base framework, it is something similar to Struts action, their each and every request handled by one action, transaction begins before execution and commits after execution.

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  • AjaxFileUpload return download panel when data is json

    - by Tr.Crab
    I use AjaxFileUpload (http://www.phpletter.com/Our-Projects/AjaxFileUpload/ ) to upload a file and get json result type response in struts2 ( code.google.struts2jsonresult.JSONResult ) but browser always pop-up download pane, plz give me some suggestions, thanks in advance Here is my config in struts.xml : ...... <result-type name="json" class="code.google.struts2jsonresult.JSONResult"> ............ <action name="doGetList" method="doGetList" class="main.java.GetListAction"> <result type="json"> <param name="target">jsonObject</param> <param name="deepSerialize">true</param> <param name="patterns"> -*.class</param> </result> </action> and js client : function ajaxFileUpload(){ $("#loading").ajaxStart(function(){ $(this).show(); }).ajaxComplete(function(){ $(this).hide(); }); $.ajaxFileUpload ( { url:'doGetList.do', secureuri:false, fileElementId:'uploadfile', dataType: 'json', success: function (data, status) { if(typeof(data.error) != 'undefined') { if(data.error != '') { alert(data.error); } else { alert(data.msg); } } }, error: function (data, status, e) { alert(e); alert(data.records); } } ) return false; }

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  • Scale an image which is stored as a byte[] in Java

    - by Sergio del Amo
    I upload a file with a struts form. I have the image as a byte[] and I would like to scale it. FormFile file = (FormFile) dynaform.get("file"); byte[] fileData = file.getFileData(); fileData = scale(fileData,200,200); public byte[] scale(byte[] fileData, int width, int height) { // TODO } Anyone knows an easy function to do this? public byte[] scale(byte[] fileData, int width, int height) { ByteArrayInputStream in = new ByteArrayInputStream(fileData); try { BufferedImage img = ImageIO.read(in); if(height == 0) { height = (width * img.getHeight())/ img.getWidth(); } if(width == 0) { width = (height * img.getWidth())/ img.getHeight(); } Image scaledImage = img.getScaledInstance(width, height, Image.SCALE_SMOOTH); BufferedImage imageBuff = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); imageBuff.getGraphics().drawImage(scaledImage, 0, 0, new Color(0,0,0), null); ByteArrayOutputStream buffer = new ByteArrayOutputStream(); ImageIO.write(imageBuff, "jpg", buffer); return buffer.toByteArray(); } catch (IOException e) { throw new ApplicationException("IOException in scale"); } } If you run out of Java Heap Space in tomcat as I did, increase the heap space which is used by tomcat. In case you use the tomcat plugin for Eclipse, next should apply: In Eclipse, choose Window Preferences Tomcat JVM Settings Add the following to the JVM Parameters section -Xms256m -Xmx512m

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  • What are the advantages of using J2EE over ASP.net?

    - by m_oLogin
    We are currently planning to launch a couple of internal web projects in the future. Our company's dev teams are mostly experienced in J2EE and have worked with it for years. Today, we have the choice of launching a couple of our projects on .net. I have checked out a couple of sources on the net, and it seems like the "J2EE vs ASP.net" combat brings out as much discord as the overseen "Apple vs Microsoft" or "Free Eclipse vs Visual Studio"... Nevertheless, I have been somewhat quite impressed with ASP.net's abilities to create great things with huge simplicity (for ex. asp.net ajax's demos). No more tons of xmls to play with, no more tons of frameworks to configure (we usually use the famous combo struts/spring/hibernate)... It just seemed to me that ASP.net had some good advantages over J2EE, but then again, I may speak by ignorance. What I want to know is this : What are the real advantages of using J2EE over ASP.net? Is there anything that cannot be done in ASP.net that can be done in J2EE? Once the frameworks are all in place and configured, is it faster to develop apps in J2EE than it is in .net? Are the applications generally easier to maintain in J2EE than in ASP.net? Is it worth it for some developpers to leave their J2EE knowledge on the side and move on to ASP.net if it does exactly the same thing?

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  • The most expressive web app programming language/framework combination?

    - by Thor
    When concerned about creating web applications, I often ask myself how I can make the code easy to read and above all; how to make it easy to maintain. There has been alot of inventions in the last couple of years with probably millions of programmers sharing these thoughts. So, lets test if we can squeeze the distilled knowledge of millions of StackOverflow users for this ultimate answer: Which language/framework combination in the world right now is the most expressive to do common tasks? Please provide a simple example of simplicity, add a link to more information about the language, and no more than one entry per language/framework combination. Specifications: "Web application" in this context refers to applications that runs on a server and outputs HTML/Javascript/CSS for rendering on a client browser. Any server operating system is ok. "Language/Framework combination" can for example be like Java+Struts or Java+SpringWeb or Perl+CGI or Java+ZK "Most expressive" in this context is meant to be minimal code to do common tasks. "Common tasks" include simple output/input, i.e. form specifying, displaying and processing, as well as simply styling of output. I am more concerned about minimality than about complete functionality. A decent language design can have great potential even though it is not complete.

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  • Fastest way to learn Flex and Java EE?

    - by LostWebNewbie
    Ok so me and my 2 friends have to make a webapp and well we think it's a good opportunity to learn JEE and Flex. The thing is we have very little knowledge about them and we have only 3 months to do it (it doesn't have to be super complicated). So my question is: what, in your opinion, would be the fastest way to learn them both? I guess we need to know some JSP, Serlvets, JPA (??), Flex, maybe JavaScript+CSS? Anything else like EJB? Should we also learn Spring (or Struts)? Obviously reading books would be a good idea, but I bet we won't make the deadline if we try to read all the books... @Edit: I know the basics of JSP/Servlets (read Head First JSP&Servlets) but I made only 1 project so far (a semi-decent hangman with JSP/Serlvets and JPA for persistance) that's about it. Flex - I'm just starting, I know really the basics of mxml and as3. As for why: 1) because we need to do a project for the uni and well I was thinking bout becoming a web dev (yup - jee+flex) after graduation, this is the perfect opportunity to learn them.

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