Looks like a PopupPanel/DialogBox thats not closed correctly. Probably a
left over of your modifications to GWT's example project. Take a look
through your code and make sure it gets closed correctly by calling its
hide() method.
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The fact that a custom widget uses MVP should be hidden so you would end up
having:
MyCustomWidget extends Composite implements CustomView {
MyCustomWidget() {
myPresenter = new Presenter(this); //takes CustomView as argument so
you can mock the view while testing the presenter
}
Image img = new Image();
RootLayoutPanel.get().add(img);
RootLayoutPanel.get().setWidgetTopHeight(img, 100, Unit.PX, 12, Unit.PX);
RootLayoutPanel.get().setWidgetLeftWidth(img, 100, Unit.PX, 12, Unit.PX);
should work I guess. RootLayoutPanel is just a singleton LayoutPanel.
-- J.
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As your view is singleton you have to tell the presenter that it should
detach itself from the view, e.g. by introducing a public
Presenter.unbind() method. You then have to call that unbind() method
before you throw away your presenter instance. Your presenter needs to
remember the
Create a DTO that describes the image map, something like:
ImageMap
- String: imageUrl (would point to your png-image servlet)
- ListImageMap.Area: areas (calculated on server using your lib)
ImageMap.Area:
- ShapeTypeEnum: shape (RECT, CIRCLE, POLY)
- ListInteger: coords
- String: href
-
The documentation of GWT gives a pretty good overview about UI / server
communication: https://developers.google.com/web-toolkit/doc/latest/DevGuide
For a widget overview you can take a look at the
Showcase: http://gwt.google.com/samples/Showcase/Showcase.html#!CwCheckBox
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So for each image to server requests are necessary:
1 to get the dto and create html with image-url
2 to get the image from servlet
Yes, although the second request is done by the browser and not by your GWT
app. To remove the browser request, you would need to use data uris
(base64)
Could we please just stop confusing ActivitiesPlaces and MVP?
+1
Maybe we should write an example app that only deals with Activity Place
and that uses some widgets that internally do MVP. So no Activity
implements Presenter stuff.
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Should GWT 2.5 SDK then bundle Hibernate Validator 4.1.0 if it depends on
that specific (older) implementation? Or at least mention it somewhere in
the docs that Hibernate 4.1.0 is the way to go?
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Am Montag, 17. September 2012 15:54:20 UTC+2 schrieb Chris Lercher:
Ok, thanks.
On
All code in your GWT app's client package will be run by the users web
server and not your WebLogic app server.
If your WebLogic app server throws an OutOfMemory exception then you have
an issue in your GWT-RPC method implementation and not in the PopupPanel.
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SimpleLayoutPanel stretches its child to fill the whole area. It does so by
using absolute positioning with top, left, bottom, right: 0px (see
SimpleLayoutPanel.setWidget() source code).
Thats why your padding does not have any effect.
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How do you do that? I was under the impression that you could only add one
layoutPanel via RootLayoutPanel.get(). Would you have a code fragment I
can look at - thank you very much.
It's like:
RootLayoutPanel
-- DockLayoutPanel
-- NORTH: header
-- CENTER: SplitLayoutPanel
Have you tried to attach an event listener (DOM.addEventListener()) to
these anchors and call ClickEvent.preventDefault() when you click on them?
That could suppress the history change and you can scroll your html
document yourself by reading the href attribute and searching the anchor
you
The Polygon class is a JavaScriptOverlay type provided by Google and it
does not have a no-arg constructor, so you can't use it with GWT-RPC. Other
than that I assume you can't use JSO's on server side either (How should
JSNI work on server side?) so it does not make sense to use them in a
Thanks. Good to know.
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Am Sonntag, 23. September 2012 08:17:10 UTC+2 schrieb KevMo:
I'm not sure how many people this will affect, but I thought I would send
out a heads up. Check out these posts for more information:
Hm we use DevMode and rename-to and never had any problems with it. We have
something like App.gwt.xml, DevApp.gwt.xml (contains logging and inherits
App.gwt.xml), DevAppGecko.gwt.xml (contains use.agent and inherits
DevApp.gwt.xml) and all have the same rename-to=app attribute, so we
don't
Honestly I have never used GWT designer. Eclipse + Google Plugin provides
pretty good auto completion in UiBinder xml files. Just make sure you open
the UiBinder xml with the UiBinder Template Editor (right click - open
with) that comes with the Google Plugin.
Sure this does not solve your
I would say so. Last commit has changed the pom.xml of GWT examples to
include GWT 2.5 RC2 as dependency
(http://code.google.com/p/google-web-toolkit/source/detail?r=11299)
-- J.
Am Dienstag, 25. September 2012 14:59:26 UTC+2 schrieb Samyem Tuladhar:
Is the 2.5 release still on track? Still
1) I included the following in WEB-INF/libs (they are in subfolders like
WEB-INF/libs/validators/.. for structuring.. hope thats no problem)
Unfortunately that is a problem. Put all libraries into WEB-INF/lib without
using sub folders and it should work. If you want sub folders in
If you want to use Hibernate I guess the persistence provider is wrong.
Looks like its the one of EclipseLink.
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I am using stable Chrome Version 21.0.1180.89 and do not have any problems
with DevMode plugin on Mac OS (10.8.2). I switched to stable Chrome because
lately the DevMode plugin stopped working for me in all the dev versions of
Chrome.
-- J.
Am Mittwoch, 26. September 2012 03:37:59 UTC+2
It works with stable Chrome 21.x.xxx. Just don't use the Chrome Beta build.
-- J.
Am Mittwoch, 26. September 2012 18:49:08 UTC+2 schrieb Jambi:
Hey guys,
today I was starting my gwt app in Chrome and there appears a message that
the dev plugin couldn´t be loaded. I think this could be the
You should also consider using Firefox during development. The DevMode
plugin for Firefox is *a lot faster* than the Chrome plugin.
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Your entity is serializable and you want to send it from server to client.
Most JPA providers enhance entity classes to support features like lazy
loading, so although you have used a java.util.List in your entity code it
could very well become an org.apache.openjpa.kernel.DelegatingResultList
Your structure should be:
src
|-- mystock
|-- client
| |-- Stockexample.java
| |-- LoginGWT.java
|-- StockExample.gwt.xml
If thats your structure, does the error go away if you add source
path=client/ to your StockExample.gwt.xml? Following the documentation
it should
Do you have Chrome Frame installed? Is IE8 maybe in compatibility mode?
-- J.
Am Mittwoch, 3. Oktober 2012 02:05:22 UTC+2 schrieb jones34:
There's a good chance this is not gwt-related, but if anyone has run into
this and has any quick suggestions it would be greatly appreciated.
thanks
Do any script errors occur in IE? If so, you could compile your app in
PRETTY mode and use IE's development tools to see whats going on.
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Hmm couldn't see why there should be a ClassCastException. As a side note,
your equals() method is not correct, email/code can be null and two
instances containing the same null variables are currently unequal (your if
forbids null values). You should also overwrite hashcode() because you have
I think you dont need a GWT module for gwt-syncproxy. It should work in a
pure JUnit test as it does not use GWT.create() for creating the GWT
service. gwt-syncproxy uses Java's dynamic proxy to implement the service
interface and uses Java's HttpUrlConnection to call your server.
-- J.
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Jens, thank you but as I suspected I have troubles. What do you mean with
a pure JUnit test ? you mean a non gwt program ? A pure junit test
launched from a normal java runtime, not in GWT ?
Yes. See the provided tests of gwt-syncproxy
(e.g.:
http://code.google.com/p/gwt-syncproxy
Someone else already explained it ;-)
http://carlosaguayo.posterous.com/html5-history-in-gwt
Also read the two comments on that page.
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The data will be served by your server and your GWT application only knows
how to construct URLs pointing to that server data. ClientBundle is for
static data that should and will be cached by the client, so for a flickr
like app you won't use ClientBundle for the actual images but only for
I am also happy with GWT, working with it for about 2 years now. I like the
fact that I get all the benefits of a strongly typed language like Java
(strong IDE support, Java debugging features thanks to DevMode, static code
analysis) and you get some nice build-in features through GWT like
Check out gwt-voices.
-- J.
Am Sonntag, 7. Oktober 2012 02:59:00 UTC+2 schrieb jones34:
Is there any way (a widget, maybe) I can play an MP3 that I have as gwt
resource, without leaving gwt or sending the user to a new browser tab? An
MP3 player widget, maybe?
thanks
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I think I would store data changes locally and when the device is back
online I would send everything to the server and let the server synchronize
it with its server database. The server can send conflicts back to the
client and then let the user choose which version of the conflicted data
http://gwt-code-reviews.appspot.com/1726805
They changed the API from Command to ScheduledCommand recently and I would
guess that GWT Designer does not respect this yet.
So you best file an issue
at http://code.google.com/p/google-plugin-for-eclipse/
or http://code.google.com/p/gwt-designer/
There are at least two (old) issues for it:
http://code.google.com/p/google-web-toolkit/issues/detail?id=1127
http://code.google.com/p/google-web-toolkit/issues/detail?id=2182
In the comments someone mentioned that he has created a library:
http://code.google.com/p/gwt-selection/
Maybe you
And searching in google gives me the following result:
http://stackoverflow.com/questions/12542522/how-to-get-cursor-position-or-location-from-richtextarea-in-gwt
Maybe that also works for you.
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It caches compilation artifacts (GWT compile and DevMode) so that iterative
development is faster.
When Eclipse says that this resource is out of sync with your file system
it pretty much means that Eclipse has detected changes to these files since
the last time Eclipse has read-in these
You have a static variable that is instantiated when its needed (lazy
instantiation).
private static AsyncCallbackPerson findPersonCallback;
private AsyncCallbackPerson createFindPersonCallback() {
if(findPersonCallback == null) {
findPersonCallback = new AsyncCallbackPerson() {
Doesn't look that wrong. You need to add validation annotations to the
proxy class if you want to do client side proxy validation.
As you want to reuse the validation annotations on the server I would think
about defining an additional interface IEmployee so that your server
Employee class do
There is no onScrollbarClick event or similar. For scrollable DIV's you
could listen for click events and then calculate if the click has happend
inside the rectangle of the scrollbar. Not sure if this works with all
browsers.
See:
Correct me if I am wrong.
You have a GWT application up and running on your application server
(jetty, tomcat, or similar) and now you want to move your compiled app
(HTML/Javascript) to an external web server on a different domain/host. To
do so you have two options:
1.) Enable CORS on your
And ScrollPanel.addScrollHandler() does not work for both cases?
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You can cast your GWT-RPC service interface into ServiceDefTarget and set a
custom RpcRequestBuilder. Your custom RpcRequestBuilder should overwrite
doSetCallback() and wrap the provided RequestCallback with a custom one. In
RequestCallback.onResponseReceived() you have access to HTTP headers.
You can use a push approach where the server actively pushes data to its
clients via WebSockets (works only on modern browsers and you need a server
that knows WebSockets) or you can use a long polling approach (Comet) where
the client makes a request to the server and the server does not
scalability is important for me. I want to make strong use of server push
once I have a working skeleton. For example, I would like to push chess
moves to all clients that are currently watching a chess board: The two
players and all visitors. There are other chess servers that do this
Something like this does not exists as far as I know.
You can create a static factory method like Services.newXyzService(), do
a global text search for GWT.create(service.class) and replace it with
the corresponding factory method. After a global organize imports done by
your IDE everything
Does your JSP file contain a script tag that points to
/moduleName/moduleName.nocache.js ?
See:
https://developers.google.com/web-toolkit/doc/latest/DevGuideOrganizingProjects#DevGuideHostPage
-- J.
Am Mittwoch, 17. Oktober 2012 07:56:35 UTC+2 schrieb venu:
Hi, I am new to GWT and i want to
ok, but if the user should be able to do this one would have to implement
such a functionality?
Yes.
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If you want to do this outside the Datagrid you can use
DataGrid.addCellPreviewHandler(). The event contains all the information
you need.
And it is SelectionModel? super T because its less restrictive. For
example you can have a DataGridInteger that holds a more generic
SelectionModelNumber.
Editor Framework: RequestFactoryEditorDriver.getPaths() is one solution. It
gives you all paths needed by your Editor hierarchy.
In GWT 2.5 there is a global/wildcard operator
*: http://code.google.com/p/google-web-toolkit/issues/detail?id=6697 (but
** is not supported yet).
I think thats all
Hopefully you have called uiBinder.createAndBindUi(this) after
instantiating your tabPanel_? If not it won't contain any tabs.
How/when do you call your render() method? Maybe you have refactored
something while migrating to GWT 2.5?
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You can globally listen for all browser events by using
Event.addNativePreviewHandler(). Inside the handler you can globally check
for shortcut keys on keydown / keyup events.
But be aware that there are inconsistencies between browsers for the return
values of NativeEvent.getKeyCode() and
Is it possible to perform regular Java object serialization in the GWT
client?
Puh, once compiled your Java code is JavaScript code. No JVM available, no
reflection available, classes/methods/variable names obfuscated. So your
only chance would be a GWT generator that produces
Simply add the annotations to the classpath of GWT compiler and it should
work. They won't compile to JS but the compiler needs them to load you
client side classes. Also I guess you need everything on classpath that
your annotations reference.
The real issue you may have is that JPA providers
These are Java's anonymous classes. Activities/Presenters typically have
quite a few of them because of Callback implementations.
class MyActivity {
doStuff() {
service.call(new AsyncCallback() {
//implement
});
}
}
will result in Activity$1 because of anonymous
I am thinking about moving away from Eclipse (IMHO 4.2 feels really
sluggish) and switching to Intellij IDEA 12 when its released.
Is anybody here that has used both Eclipse + GPE and Intellij + GWT Plugin
and can share his/her experience? Having Jetbrains joining the GWT steering
group I
Take a look at:
https://github.com/Atmosphere/atmosphere
https://github.com/Atmosphere/atmosphere/wiki
*https://github.com/Atmosphere/atmosphere/wiki/Getting-started-with-GWT*
For downloading latest binary
version: http://search.maven.org/#search%7Cga%7C1%7Corg.atmosphere
There are also
AutoBeanUtils.getAutoBean(payload); will only return an AutoBeanIPayload
instance if the method parameter already belongs to an AutoBean (see
JavaDoc).
So things would look like the following (from memory, hopefully its
correct):
//GWT client side
MyAutoBeanFactory factory =
1.) Can't you use SQL Limit/Offset keywords to select the range? Would
probably simplify your server code a bit and your DB knows what you want to
do.
2.) Some (if not all) databases should be able to log slow queries if
configured. If thats not possible add some time tracking and logging code
Am Montag, 22. Oktober 2012 11:21:19 UTC+2 schrieb Thomas Broyer:
Not with the Google Plugin for Eclipse.
I think he means full JS auto complete. Doesn't GPE only provides auto
complete for calls from JSNI back to Java?
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Am Montag, 22. Oktober 2012 17:31:02 UTC+2 schrieb Joseph Lust:
However, I fear I'm also too invested in Eclipse and in many ways it does
all that IntelliJ does. However IntelliJ is quicker and has support behind
it. If I didn't have 3 years of memorizing every button/preference and
Use GWT's Animation class for full cross browser animation. You can
implement your custom animations and also run them in parallel, e.g. a
fade-in animation and a bouncing-drop animation in parallel similar to what
Googles Hotel Finder uses.
Other options are CSS3 transitions and/or animations
Basic example can be found in the
showcase: http://gwt.google.com/samples/Showcase/Showcase.html#!CwAnimation
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I would check the example's xml files in WEB-INF and META-INF directory to
see if any servlet paths are incorrect for your deployment. Maybe you have
just deployed it differently than the example expects (different webapp
context root for example).
Also, just to test the example, can't you
For a secure GWT application:
- *use SSL for the entire app*
*- check for SSL vulnerabilities and update your server accordingly *
*
*
- use your app servers session id and send it as payload from server to
client during login and then from client to server on each request. On the
server check
No idea if tomcat/jboss support it or not but in case they don't you can
always have a web server in front of your application server. This web
server would serve your static pre-compressed GWT client files and proxies
remote service calls to your application server. Apache and Nginx can be
And gwt-servlet.jar is in your war/WEB-INF/lib folder?
In your stack trace you can see:
at
com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:207)
which indicates that you are using AppEngine. The IsolatedAppClassLoader
JavaDoc states that it
I guess it is
s.setBackgroundImage(url(img/Background/std.jpg));
The image should be loaded by the browser as soon as you have called the
function and its set to the element.
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Remember to clean up the EventListener when you don't need it anymore.
Failure to do so can result in memory leaks.
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When you create two HelloWorld widgets each of them receives its own
events. If you use @UiHandler in your UiBinder widget and you want to stop
receive events for a widget without removing the widget itself from the
parent (for whatever reason) you have to disable your @UiHandler
Since November 2009 Java5 isn't supported anymore by Sun/Oracle and we are
reaching 2013. So it should be fine that GWT now requires Java 1.6 and
their jar files are also build using target 1.6.
Also Websphere 6.1 reaches its EOL in september 2013 (increased by one
year. Original date was
Still, other then saying that it is so because it has been said so - I
still don't see an argument why the gwt-servlet.jar would technically
require Java 1.6.
True, but some day you have to make the cut. Technically they probably have
used a Java 1.6 API somewhere thats not available in
You are using Google AppEngine so you must conform to their sandbox
restrictions.
Read the Thread passage in the
docs:
https://developers.google.com/appengine/docs/java/runtime?hl=en#The_Sandbox
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I also have a app and a common project in Eclipse. Both are GWT enabled
projects and app has common as a project dependency. Also the
app.gwt.xml GWT module inherits common.gwt.xml.
When you compile app using the GWT compiler it will compile everything it
sees starting from the module you
Haven't tried it yet but as GWT BeanValidation has implemented the JSR303
TCK tests you should be able to create custom validation annotations and a
corresponding validator.
That way you would end up having something like
@ValidPassword(repeat = repeatPassword) //custom annotation that links
Make sure that your app server can still find the HASH.rpc file. Thats
your GWT-RPC serialization policy file that the server must know in order
to serialize anything that implements Serializable. If it does not find
this file it falls back to the old IsSerializable mechanism and if you do
not
When you want to edit a new instance (regardless if its an empty instance
or not) you would create a new editor driver and call edit() with the new
instance. As the editor graph represents more or less your object graph
this should be enough to update the Ui. If the instance is empty the Ui
+1 except you don't have to create a new editor driver, you can reuse a
previously built one.
Wasn't there a memory leak somewhere in the editor framework when you reuse
the driver? That was somewhere in my head while answering. But maybe its
already solved.
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If Axis spawns threads internally you can't use it on AppEngine unless you
modify Axis to use AppEngines ThreadManager.
http://code.google.com/p/googleappengine/wiki/WillItPlayInJava states:
*JAX-WS is supported for web service clients but not for servers. To write
a SOAP server on App Engine
Broyer:
On Thursday, November 1, 2012 7:45:30 PM UTC+1, Jens wrote:
+1 except you don't have to create a new editor driver, you can reuse a
previously built one.
Wasn't there a memory leak somewhere in the editor framework when you
reuse the driver? That was somewhere in my head while
How do you plan to get the payload of any GWT-RPC request to the server
when using HTTP GET? Using URL parameters can be pretty unsafe because
every GWT-RPC payload should contain your app's security token / session id
to prevent CSRF attacks.
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If you dont plan to deploy your app to AppEngine then remove AppEngine from
your project. If you want to use AppEngine then you should read AppEngine
documentation and ask for help on the AppEngine group.
I haven't used AppEngine so far, so I can't help you any more.
Also
You can switch out the default RpcRequestBuilder of any GWT-RPC service.
Your custom RpcRequestBuilder would overwrite doCreate() to create a
RequestBuilder that uses GET instead of POST. Everything else should
continue to work without any further modifications. To change the default
Take a look at the release notes to see if any breaking change could
possibly affect GXT 2:
https://developers.google.com/web-toolkit/release-notes
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Ouch! Totally forgot that you have to return the proxy on client side :(
Well in that case you probably have to duplicate your validation
annotations or implement the proxy interface in your entity as mentioned
above. I would go with duplication as the entity shouldn't be a proxy. It
should be
Sounds like the rescue ;-) Indeed that works.
-- J.
Am Dienstag, 6. November 2012 10:13:59 UTC+1 schrieb Thomas Broyer:
On Monday, November 5, 2012 9:31:30 PM UTC+1, Jens wrote:
Ouch! Totally forgot that you have to return the proxy on client side :(
Well in that case you probably have
It's the same as the CSS font syntax.
http://www.w3.org/TR/2010/WD-2dcontext-20100624/#text
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Take a look at
http://code.google.com/p/google-web-toolkit/source/browse/trunk/samples/validation/src/main/java/com/google/gwt/sample/validation/client/
The sample uses a custom MessageResolver that in turn uses GWT's
ConstantsWithLookup i18n interface.
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Can you:
1.) compile your app in PRETTY mode so you can read JS source code easily
2.) enable iOS inspector and use Safari 6 on Mac OS to connect to your
iphone/ipad for remote debugging
(http://moduscreate.com/enable-remote-web-inspector-in-ios-6/)
3.) In Safari 6 web inspector go to
1. Look for *.nocache.js files in body - but this could trigger on non
GWT sites if someone likes that name/scheme
Can produce false positive as well as false negatives. I think you can
rename nocache to anything and, like in Google Groups, you don't have to
use the *.nocache.js
When you declare an exception (checked or unchecked) in an interface it
means that anyone who uses this interface should be prepared to handle this
exception but it does not mean that every implementation of that interface
must throw this exception. Maybe an implementation exists that simply do
To run the example:
1.) checkout: https://github.com/Atmosphere/atmosphere-extensions
2.) go into gwt/samples/gwt-chat
3.) run DevMode via mvn gwt:run
https://github.com/Atmosphere/atmosphere does not contain the gwt-chat
example.
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Tried it yesterday and had the same error. Maybe Maven pulls in a library
thats not really compatible with the demo so I have done
mvn install
in /atmosphere-extensions/gwt/
to install all the atmosphere gwt snapshots into my local repository and
then re-run mvn gwt:run in the gwt-chat
The docs talk about checked exceptions. These are exceptions that extend
Exception and not RuntimeException. A checked exception is part of the API
as you can not throw a checked exception without defining a throws clause
on a method. Also you must use a try catch block when you want to call a
Looks like you have to use GWT 2.5.
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Simply check for updates in Eclipse. You should see updates for Google
Eclipse Plugin and GWT SDK. GWT 2.5 has officially been released.
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Am Donnerstag, 15. November 2012 04:58:55 UTC+1 schrieb Magnus:
Looks like you have to use GWT 2.5.
Ok.
I always used GWT with the eclipse
2-3 minutes really hurts! How large is your app? We have about 150k LOC and
a refresh in Firefox takes ~5 seconds. As DevMode with Firefox seems to be
leaking memory sometimes I have configured DevMode to use 1,5G heap space
and 1G permgen space. Our app uses GWT-RPC (single service with lots
As the server has no idea in which mode the client runs, the client has to
tell it the server.
The default RpcRequestBuilder adds the header x-gwt-permutation to server
requests to prevent CSRF attacks. It contains the permutation name in
production mode and HostedMode when running DevMode. So
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