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• Too slow gwt develpment mode !

  - by Ehsan Khodarahmi

  I'm using eclipse galileo with latest GWT 2.0 version in development mode, but it runs really slow (i should wait about 1 minute to open one page, but after compilation, my application works very well when I run it using tomcat 5.5). My code is not too heavy & i guess there is an os-related or software inconsistency problem, because I'd this problem before, but when i reinstalled my windows vista sp2 (I formatted my windows drive & reinstalled it), my problem solved for just some days & then again it became to slow ! I didn't install any special software on my windows, so i really dont know why this problem occures ??? any suggestion ?

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• Detecting GWT RichTextArea 'dirty' state

  - by David

  I want to detect when the contents of my GWT RichTextArea become 'dirty' (have been changed by the user) in order to enable a 'save' button accordingly. I suppose I could listen for key presses that are likely to have changed the contents; but browser support for key presses is notoriously quirky. I suppose I could, before editing begins, save the original contents in a variable, and upon key press, compare the current contents against that variable, but doing that on each key press is going to be really slow. Is there some neat way to achieve RichTextArea dirty-detection?

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• question on regular servlets within GWT (working in dev mode ,not working in deployment in tomcat)

  - by molleman

  Hello guys, i am having trouble with my web application developed in GWT. the application allows users to upload and download using an upload servlet and a download servlet, the upload servlet was created using the gwtUpload library. the download servlet is using regular HTTPServlet. when i run the application within eclipse the download servlet works fine, when i deploy it to tomcat, when a user selects to upload a file, the file does not download, when a user selects a link to download a file, this error is returned type Status report message /testhibernategilead/downloadServlet description The requested resource (/testhibernategilead/downloadServlet) is not available. can anyone explain why this is

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• GWT HTML widget security risks

  - by h2g2java

  In GWT javadoc, we are advised If you only need a simple label (text, but not HTML), then the Label widget is more appropriate, as it disallows the use of HTML, which can lead to potential security issues if not used properly. I would like to be educated/reminded about the security susceptibilities? It would be nice to list the description of the mechanisms of those risks. Are the susceptibilities equally potent on GAE vs Amazon vs my home linux server? Are they equally potent across the browser brands? Thank you.

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• gwt not showing the right image

  - by arinte

  I have a gwt image object . In my code I set my visibleRect like this: btnSearch.setVisibleRect(-64,-80,16,16); So when I run my code with firebug the html looks like this: <img border="0" style="width: 16px; height: 16px; background: url(&quot;http://tempest/deltaflow/Content/Images/icon.png&quot;) no-repeat scroll 64px 80px transparent;" src="http://127.0.0.1:8888/trunkui/clear.cache.gif"> Why is the '-' left off? When I edit it with firebug to have the '-' it works fine.

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• How to set attribs in GWT?

  - by Jonas Byström

  I'm not getting any effect out of DOM.setElementAttribute, am I doing something wrong? class MyListBox extends com.google.gwt.user.client.ui.ListBox { .... protected void setHoverAutoWidth() { addDomHandler(new MouseOverHandler() { public void onMouseOver(MouseOverEvent event) { DOM.setElementAttribute(getElement(), "width", "auto"); } }, MouseOverEvent.getType()); addDomHandler(new BlurHandler(){ public void onBlur(BlurEvent event) { DOM.setElementAttribute(getElement(), "width", "100px"); } }, BlurEvent.getType()); } } (I know there are less hacky ways to change the width than to set the style attribute directly, but I don't care about css right now.) Edit: Oops, just realized that width does not change the style width, just adds a width attribute to the tag (which explains why nothing happens). Any suggestions on how to modify the style are still welcome!

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• Resolve HTTP 304 - not modified in AJAX call made via GWT

  - by Salvin Francis

  We are using an application made in GWT with the server as tomcat. The project runs fine normally, however there are situations where the server is restarted. At such point of time, the ajax call made by the code below returns blank text with the status code as 304 RequestBuilder requestBuilder = new RequestBuilder(RequestBuilder.POST, URL.encode(serverUrl)); //-- serverUrl is the url to which this call is posted to. requestBuilder.setHeader("Content-Type", "application/x-www-form-urlencoded"); requestBuilder.setHeader("Expires","0"); requestBuilder.sendRequest( postData, new RequestCallback() { public void onError(Request request, Throwable exception) { //Do nothing } public void onResponseReceived(Request request, Response response) { //sometimes when the server is restarted, I get response.getStatusCode() = 304 and the response.getText() as blank } } ); normally we get back some data from the server inside this response text. How do we now get the data when the response itself is blank ?

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• Wrapping pre-made elements using GWT?

  - by user246114

  Hi, I've been working with GWT for awhile, I can't find a way to integrate it with a preexisting website which is a real downer. My page content is already generated for me using jsp, like: <div id='A'></div> <div id='B'></div> etc. there is no way for me to do something like this though: public void onModuleLoad() { SimplePanel spA = new SimplePanel( Document.getElementById("A")); spA.add(new Label("hello")); SimplePanel spB = new SimplePanel( Document.getElementById("B")); spB.setWidth("200px"); etc .. } seems like there's no way to just wrap a pre-existing element. Is this true, or am I missing how to do this? I need be able to wrap a bunch of elements like this, to manipulate them later on. I see TextBox, Button, a few other classes have wrap() methods, however nothing like that exists for elements, Thanks

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• GWT HTMLTable colaspan feature

  - by Sanjay

  Hello all I am using HTMLTable of import com.google.gwt.user.client.ui.HTMLTable I instantiated it like below: HTMLTable table = new Grid(rows, col); Number of rows and columns are decided by the user input. Now I want to used colspan for the specific rows of the table. One way to this is apply css to the that specific row.But problem with this is that Number of column to span are decided by the user input, i.e It may vary every time. So by using css it is something like making it static. So I want to know the way through which I can do colspan on the rows of the table. and Number of column to span is different every time. Thanks in advance

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• GWT celltable Simple pager Next and previous buttons

  - by Saritha

  I am working on a CellTable with a SimplePager. My paging works fine in the sense when i set the page size to be 5 only 5 records are being displayed. My question is that do next and previous buttons come by default or do we have to configure them. I have seen the show case example code and i do not see any external configurations . my SimplePager code is as follows: //create pager SimplePager.Resources resources = GWT.create(SimplePager.Resources.class); SimplePager simplePager = new SimplePager(TextLocation.CENTER, resources , false, 0, true); simplePager.setDisplay(cellTableSearchResults); simplePager.setPageSize(5); // create data provider ListDataProvider<GridDTO> dataProvider = new ListDataProvider<GridDTO>(); dataProvider.addDataDisplay(cellTableSearchResults); dataProvider.setList(components); Please help.

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• Place GWT application on Jetty

  - by Noor

  Can someone help me to place my GWT application on Jetty. I am not using maven. I have libraries in my build path. First I am taking the war folder already exploded and copy it in jetty/webapps, then in folder context. I have placed a folde named BiddingSystem in folder web apps, it is an already exploded folder and not a .war file In folder jetty/context, there is a file test.xml I am renaming the file to BiddingSystem.xml and also editing content of BiddingSystem.xml, finally the content of BiddingSystem.xml is <?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN" "http://www.eclipse.org/jetty/configure.dtd"> <configure class="org.mortbay.jetty.webapp.WebAppContext"> <set name="contextPath">/BiddingSystem</set> <set name="war"><systemproperty name="jetty.home" default="."/>/webapps/BiddingSystem</set> </configure> I am getting this error:

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• GWT Clipped image

  - by Kasturi

  I am creating a widget in which a portion of an image will be highlighted and the remaining portion will have an opacity 0.5. For this i am using two images. The full image at the back with opacity 0.5. the portion of the image i want to be highlighted in the front. the front image is GWT's Clipped image. I have a scenario where i have to resize the back image. Is there any way to resize the clipped image at the front?

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• GWT 100% height panel with scroll

  - by Andrey

  Hello! Could anyone help me make normal layout in GWT. I need a main panel which: fills all the browser space (100% height); if being collapsed too much shows scroll bars (autoscroll). When I use old layout (RootPanel, VerticalPanel) I have scroll, but can't get 100% height. When I use new layout (RootLayoutPanel, DockLayoutPanel) I get 100% height, but I don't get any scroll. And also I have some troubles in IE. Is there any sample showing how to achieve both goals? Thanks in advance!

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• gwt+xml- can i read through incomplete XML using the GWT XML Parser

  - by Arvind

  I have a requirement where a user is typing in XML in a text area, and I want to show the various nodes in a tree...But as the user is typing in the xml, it wont be a complete xml (since he is still typing in the XML)... How do I read an incomplete XML and correctly generate the tree? I understand how to read an xml and generate nodes in the tree, what I want to know is, how to read the incomplete XML as it is being typed in

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• cxf jaxws with spring on gwt 2.0

  - by Karl

  Hi, I'm trying to use an application which uses cxf-jaxws in bean definition: <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:sec="http://cxf.apache.org/configuration/security" xmlns:jaxws="http://cxf.apache.org/jaxws" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd http://cxf.apache.org/configuration/security http://cxf.apache.org/schemas/configuration/security.xsd http://cxf.apache.org/jaxws http://cxf.apache.org/schemas/jaxws.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.0.xsd"> however in combination with the jetty from gwt 2.0 development shell my context doesn't load and I get this exception: org.springframework.web.context.ContextLoader: Context initialization failed org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace [http://cxf.apache.org/jaxws] enter code hereOffending resource: class path resource [bean_definition.xml] My project is maven-based and I got cxf-rt-frontend-jaxws which contains the namespacehandler and spring.handlers on the classpath. I added cxf-transports-http-jetty.jar as well. Has anyone experienced this kind of problem and found a solution? It seems to be a classpath issue, added the cxf-rt-frontend-jaxws.jar by hand and it works... Somehow the maven dependency doesn't get added to the classpath. Thanks in advance, karl

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• Technology Selection for a dynamic product

  - by Kuntal Shah

  We are building a product for Procurement Domain in JAVA. Following are the main technical requirements. Platform Independent Database Independent Browser Independent In functional requirements the product is very dynamic in nature. The main reason being the procurement process around the world is different from client to client. Briefly we need to have a dynamic workflow engine and a dynamic template engine. The workflow engine by which we can define any kind of workflows and the template engine allows us to define any kind of data structures and based on definition it can get the user input through workflow. We have been developing this product for almost 2 years. It has been a long time till we can get down with the dynamics of requirements. Till now we have developed a basic workflow and template engine and which is in use at one of the client. We have been using following technologies. GWT-Ext (Front End Framework) Hibernate (Database Layer) In between we have faced some issues with GWT-Ext (mainly browser compatibility) and database optimization due to sub classing in hibernate. For resolving GWT-Ext issue, which a dying community so we decided to move to SmartGWT. In SmartGWT we faced issues related to loading and now we are able to finalize that GWT 2.3 will be the way to go as the library is rich and performance is upto the mark. We are able to almost finalize GWT-Spring based front and middle layer. In hibernate, we found main issues with sub-classing due to that it was throwing astronomical queries and sometimes it would stop firing any queries for 5-10 seconds or may be around 30 seconds and then resume again. Few days back I came to one article related to ORM. I am a traditional .Net SQL developer and I have always worked with relational database. Reading through this article, I also found it relating to the issues I face. I am still not completely convinced of using hibernate and this article just supported my opinion. Following are the questions for which I am looking for an answer. Should we be going with Hibernate in case of dynamic database requirements and the load of the data will be heavy in future? How can we partition the data, how we can efficiently join the data, how we can optimize the queries? If the answer is no then how do we achieve database independence? Is our choice related to GWT and Spring proper or do we need to change that too? Should we use any other key value pair database if the data is dynamic in nature and it is very difficult to make it relational?

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• GWT, MVP, and UIBinding - How to get the best of all worlds

  - by Stephane Grenier

  With MVP, you normally bind the View (UI) with the Presenter in the Presenter. However with the latest version of GWT, especially with UIBinding, you can do the following in the View: @UiHandler("loginButton") void onAboutClicked(ClickEvent event) { // my login code } Which basically exchanges a lot of anonymous inner class code for some quick annotation code. Very nice!! The problem is that this code is in the view and not the presenter... So I thought maybe: @UiHandler("loginButton") void onAboutClicked(ClickEvent event) { myPresenter.onAboutClicked(...); } But there are several problems with this approach. The most important, you blur the lines between View and Presenter. Who does which binding, in some cases it's the View, in others it's the presenter (binding to events not in your current view but that need to be attached - for example a system wide update event). You still get the benefit of being able to unit test your presenter, but at what cost. The responsibilities are messy now. For example the binding is sometimes in the View and others times in the Presenter level. I can see the code falling into all kinds of chaos with time. I also thought of extending the Presenter to the View, so that you could do this in the View. The problem here is that you lose the Presenter's ability to run standard unit tests! That's a major issue. That and the lines again become blurred. So my question, does anyone have a good method of taking advantage of the annotation from UIBinding within the MVP pattern without blurring the lines and losing the advantages of the MVP pattern?

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• how can i use gwt-test-utils to work with gin?

  - by krrish

  i tried using the steps in http://code.google.com/p/gwt-test-utils/wiki/HowToUseWithGIN and i'm using testNG but it is giving fallowing error java.lang.ExceptionInInitializerError at com.riskfocus.examples.JsonReaderWriterTest.setupGIN(JsonReaderWriterTest.java:59) 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.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:80) at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:551) at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:213) at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:138) at org.testng.internal.TestMethodWorker.invokeBeforeClassMethods(TestMethodWorker.java:175) at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:107) at org.testng.TestRunner.privateRun(TestRunner.java:768) at org.testng.TestRunner.run(TestRunner.java:617) at org.testng.SuiteRunner.runTest(SuiteRunner.java:334) at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:329) at org.testng.SuiteRunner.privateRun(SuiteRunner.java:291) at org.testng.SuiteRunner.run(SuiteRunner.java:240) at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:53) at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:87) at org.testng.TestNG.runSuitesSequentially(TestNG.java:1185) at org.testng.TestNG.runSuitesLocally(TestNG.java:1110) at org.testng.TestNG.run(TestNG.java:1022) at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:109) at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:202) at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:173) Caused by: java.lang.UnsupportedOperationException: ERROR: GWT.create() is only usable in client code! It cannot be called, for example, from server code. If you are running a unit test, check that your test case extends GWTTestCase and that GWT.create() is not called from within an initializer or constructor. at com.google.gwt.core.client.GWT.create(GWT.java:91) at com.riskfocus.examples.client.model.StockPriceJsonReaderWriter.<clinit>(StockPriceJsonReaderWriter.java:12) ... 25 more

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• Splitting an image in GWT results in unwanted white space

  - by rancidfishbreath

  I am using GWT 2.03 and am have an image that I want to place partially in an area with a background and partially above a background. I am using a FlexTable to try to accomplish this and have used GIMP to cut the image into two sections. I am trying to load the top part of the image into row 0 and the bottom part of the image into row 1. I set the alignment of the top image to ALIGN_BOTTOM but there is a bit of space at the bottom of cell and so the two parts of the picture don't touch. Here is an image showing what I am talking about. I set the background of the cell to be yellow show where the cell boundaries are. The bottom image and background are rendering correctly. Here is the relevant code snippet: FlexTable table = new FlexTable(); table.setCellSpacing(0); table.setCellPadding(0); table.setBorderWidth(0); FlexCellFormatter formatter = table.getFlexCellFormatter(); table.setWidget(0, 0, topImage); formatter.setStyleName(0, 0, "topImageStyle"); formatter.setVerticalAlignment(0, 0, HasVerticalAlignment.ALIGN_BOTTOM); table.setWidget(1, 0, bottomImage); formatter.setStyleName(1, 0, "bottomImageStyle"); How can I get rid of that space between my image and the cell boundary?

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• GWT : Internet Explorer transparency issue

  - by dindeman

  This post concerns only IE. The last line of the following code is causing the issue. int width = 200; int height = 200; int overHeight = 40; AbsolutePanel absPanel = new AbsolutePanel(); absPanel.setSize(width + "px", height + "px"); SimplePanel underPanel = new SimplePanel(); underPanel.setWidth(width + "px"); underPanel.setHeight(height + "px"); underPanel.getElement().getStyle().setBackgroundColor("red"); SimplePanel overPanel = new SimplePanel(); overPanel.setWidth(width + "px"); overPanel.setHeight(overHeight + "px"); overPanel.getElement().getStyle().setBackgroundColor("black"); //Setting the IE opacity to 20% on the black element in order to obtain the see through effect. overPanel.getElement().getStyle().setProperty("filter", "alpha(opacity=20)"); absPanel.add(underPanel, 0, 0); absPanel.add(overPanel, 0, 0); RootPanel.get("test").add(absPanel); //The next line causes the problem. absPanel.getElement().getStyle().setProperty("filter", "alpha(opacity=100)"); So basically this code should display a red square of 200px by 200px (see underPanel in the code) and on top of it a black rectangle of 200px by 40px (see overPanel in the code). However the black rectangle is partially see through since its transparency is set to 20%, therefore it should appear in red, but of a darker red than the rectangle sitting under since it is actually a faded black item. Some rendering problem occurs because of the last line of code that sets the opacity of the containing AbsolutePanel to 100% (which in theory should not affect the visual result). Indeed in that case the panel lying over remains still see through but straight through the background colour of the page! It's like if the panel sitting under was not there at all... Any ideas? This is under GWT 2.0 and IE7.

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• accessing widgets inside a GWT element

  - by flyingcrab

  I want to access the text elements inside this textbox in GWT from the main method (where I call it like this) DialogBox aBox = newCandidatePop.buildNewElecPopup(); aBox.center(); aBox.getWidget(); MiscUiTools.newCandidateHandler(aBox.firstName, aBox.surName); in newCandidateHandler i want to attach a click handler to the two text boxes However, the above doesnt quite work - I cant get access to the aBox.firstName elements because they are static methods -- I am wondering what is best practice, how would you code something like this up? static TextBox firstName = new TextBox(); static TextBox surName = new TextBox(); static DialogBox box; // public newCandidatePop() { // box = buildNewElecPopup(); // } static public DialogBox buildNewElecPopup() { DialogBox box = new DialogBox(); box.setAutoHideEnabled(true); box.setText("Add a New Candidate"); box.setAnimationEnabled(true); box.setGlassEnabled(true); Grid dialogGrid = new Grid(2, 3); dialogGrid.setPixelSize(250 , 125); dialogGrid.setCellPadding(10); dialogGrid.setWidget(0, 0, new HTML("<strong>First Name</strong>")); dialogGrid.setWidget(0, 1, firstName); dialogGrid.setWidget(1, 0, new HTML("<strong>Surname</strong>")); dialogGrid.setWidget(1, 1, surName); box.add(dialogGrid); return box; }

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• Is a GWT app running on Google App Engine protected from CSRF

  - by gerdemb

  I'm developing a GWT app running on the Google App Engine and wondering if I need to worry about Cross-site request forgery or is that automatically taken care of for me? For every RPC request that requires authentication, I have the following code: public class BookServiceImpl extends RemoteServiceServlet implements BookService { public void deleteInventory(Key<Inventory> inventoryKey) throws NotLoggedInException, InvalidStateException, NotFoundException { DAO dao = new DAO(); // This will throw NotLoggedInException if user is not logged in User user = dao.getCurrentUser(); // Do deletion here } } public final class DAO extends DAOBase { public User getCurrentUser() throws NotLoggedInException { currentUser = UserServiceFactory.getUserService().getCurrentUser(); if(currentUser == null) { throw new NotLoggedInException(); } return currentUser; } I couldn't find any documentation on how the UserService checks authentication. Is it enough to rely on the code above or do I need to to more? I'm a beginner at this, but from what I understand to avoid CSRF attacks some of the strategies are: adding an authentication token in the request payload instead of just checking a cookie checking the HTTP Referer header I can see that I have cookies set from Google with what look like SID values, but I can't tell from the serialized Java objects in the payloads if tokens are being passed or not. I also don't know if the Referer header is being used or not. So, am I worrying about a non-issue? If not, what is the best strategy here? This is a common enough problem, that there must be standard solutions out there...

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• GWT RPC and GoDaddy Shared Hosting

  - by Mike Apolis

  Hi, I've deployed the sample Stock Watcher app to my GoDaddy Hosting site, and I get the error below. I've tried compiling the Project in Eclipse with JRE 1.5 because my Host is using jre 1.5. I think the issue is the "gwt-servlet.jar" is not compatible with jre 1.5. Can anyone confirm this. The project runs fine on my local machine using JRE 1.6. Unfortunately GoDaddy will not upgrade my shared hosting account jre to 1.6. GoDaddy Server Setup: Tomcat Version 5.0.27 JRE 1.5_22 Error: HTTP Status 500 - type Exception report message description The server encountered an internal error () that prevented it from fulfilling this request. exception javax.servlet.ServletException: Error allocating a servlet instance org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java: 117) org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java: 535) org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java: 417) org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java: 160) org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:300) org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:374) org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:743) org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java: 675) org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:866) org.apache.tomcat.util.threads.ThreadPool $ControlRunnable.run(ThreadPool.java:683) java.lang.Thread.run(Thread.java:595) root cause java.lang.UnsupportedClassVersionError: Bad version number in .class file java.lang.ClassLoader.defineClass1(Native Method) java.lang.ClassLoader.defineClass(ClassLoader.java:621) java.security.SecureClassLoader.defineClass(SecureClassLoader.java: 124) org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java: 1634) org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java: 860) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java: 1307) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java: 1189) java.security.AccessController.doPrivileged(Native Method) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java: 117) org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java: 535) org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java: 417) org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java: 160) org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:300) org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:374) org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:743) org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java: 675) org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:866) org.apache.tomcat.util.threads.ThreadPool $ControlRunnable.run(ThreadPool.java:683) java.lang.Thread.run(Thread.java:595) note The full stack trace of the root cause is available in the Apache Tomcat/5.0.27 logs. Apache Tomcat/5.0.27

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• Download dynamic file with GWT

  - by Maksim

  I have a GWT page where user enter data (start date, end date, etc.), then this data goes to the server via RPC call. On the server I want to generate Excel report with POI and let user save that file on their local machine. This is my test code to stream file back to the client but for some reason I think it does not know how to stream file to the client when I'm using RPC: public class ReportsServiceImpl extends RemoteServiceServlet implements ReportsService { public String myMethod(String s) { File f = new File("/excelTestFile.xls"); String filename = f.getName(); int length = 0; try { HttpServletResponse resp = getThreadLocalResponse(); ServletOutputStream op = resp.getOutputStream(); ServletContext context = getServletConfig().getServletContext(); resp.setContentType("application/octet-stream"); resp.setContentLength((int) f.length()); resp.setHeader("Content-Disposition", "attachment; filename*=\"utf-8''" + filename + ""); byte[] bbuf = new byte[1024]; DataInputStream in = new DataInputStream(new FileInputStream(f)); while ((in != null) && ((length = in.read(bbuf)) != -1)) { op.write(bbuf, 0, length); } in.close(); op.flush(); op.close(); } catch (Exception ex) { ex.printStackTrace(); } return "Server says: " + filename; } } I've red somewhere on internet that you can't do file stream with RPC and I have to use Servlet for that. Is there any example of how to use Servlet and how to call that servlet from ReportsServiceImpl. Do I really need to make a servlet or it is possible to stream it back with my RPC?

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• When not to use Google Web Toolkit?

  - by Jas

  I'm considering use of GWT on a major in-house web app development project, namely it's major advantage in my eyes is the cross-compilation to Javascript which would (at least theoretically) help my team reduce the size of tech stack by one. However, having been burnt before (like most devs), I would like to hear from programmers who did actually use it on any problems with GWT which would hamper, or limit, it's use within a certain problem domain. When do you not recommend using GWT, and why?

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