I think you understand the problem now.
If you wish to continue trying to get round this (i.e. continue to use
the Image newPhoto = new Image("category/photoName) approach) then you
will have to search around the Internet to see if someone has a good
solution for it (that also works in GWT hosted mode BTW!). Remember,
what you are doing is trying to use a very simple method to read the
new dynamically added photos (just by short relative URL) instead of
using a more robust persistence mechanism The public folder is not
designed to handle dynamic data like that, it's meant for static HTML,
CSS, js, image files etc. so you are hitting problems. There may be a
way to do it, I don't know. Someone must have tried before I suppose.
The alternative is to create a more robust mechanism for storing your
photo albums, setting it up automatically when you deploy the
application. One way to do this is to follow these steps:
1) Place your "start up" example albums in, say, \src\albums. When you
deploy to real Tomcat copy this folder to WEB-INF\classes\album. This
means it is in the classpath for both development and deployment.
2) Add an override init() method to your LoadPhotoFromAlbum RPC
servlet (or any other sevlet you always call before that). In this
method examine if you have already created the real photo album on
disk (i.e. you have preciously run the application on this server),
and if not copy the start up album to set it up. In a real Tomcat
instance you can specify a start up servlet in web.xml to do this, but
you can't (easily) do this in GWT hosted mode). Because you put the
the start up albums in classes\albums & src\albums, you can get at
them using \albums.
3) You need a relative disk location to store the photo album that is
separate from your web application folders but still portable. You
can, for example, place it relative to your Tomcat instance
directories. To get the directory paths you can examine System
properties. This, for example, works for JBoss, Tomcat and GWT hosted
mode Tomcat:
private static String getSystemBaseDir() {
// try JBoss
String dir = System.getProperty("jboss.server.home.dir");
if (dir!=null) {
log.info("Using JBoss: " + dir);
return dir + File.separator + "data";
}
// try Tomcat
dir = System.getProperty("catalina.home");
if (dir!=null) {
log.info("Using Tomcat: " + dir);
return dir;
}
// otherwise GWT hosted mode default
dir = System.getProperty("user.dir");
log.info("Using default dir: " + dir);
return dir;
}
use this to create and subsequently query your album directory
structure under the main Tomcat home directory, but not under the
webapps directory, or your own application's directory. If in any
doubt about which system properties are available, just put this in a
servlet:
Properties props = System.getProperties();
props.list(System.out);
4) Use a Filedownload HttpServlet to get the images instead of using
Image(url) thatreads the photo file and writes it to the servlet
response output stream. Search this group for examples of that, and
there are many examples on the net.
This will definitely work, and it will also work in GWT hosted mode,
Tomcat, and any other servlet container or application server you add
support for in that getSystemBaseDir() method.
regards
gregor
On Jan 24, 12:24 pm, Daniele <dany.hat...@gmail.com> wrote:
> Nothing works!!!
>
> For Gregory:
> Application see new photo uploaded when I click on refresh button on
> gwt browser implementation.
>
> Maybe I have understanding problem.
>
> Images uploaded necessarily go on public directory because client
> don't have access to other directory on server or local machine, ok?
> When application starting, it's copy all file present on public
> directory and put it on public directory of gwt compilation output
> (usually call com.package.modulename).
> I think error probabilly is on UPLOAD_DIRECTORY path on server side.
> Whats proper path for UPLOAD_DIRECTORY??
> If I set UPLOAD_DIRECTORY= "images/album/" application give me an
> error (resource not found or similar)...if I set
> UPLOAD_DIRECTORY="src/com/webphotogallery/public/album/" I go into
> error because this directory it's not seen by application when run,
> but only when I click on reload button..
>
> My idea are correct?
>
> Daniele
>
> (SORRY FOR MY ENGLISH!!! :) Many words are generated by Google Translate! :) )
>
> 2009/1/23, Daniele <dany.hat...@gmail.com>:
>
> > I try.
>
> > P.S.
> > If solution work, it's not important if are better or not :)!!!
>
> > 2009/1/23, seanowenha...@googlemail.com <seanowenha...@googlemail.com>:
>
> >> I had a similar problem.
>
> >> The problem I have is caused by cacheing of the images which can be
> >> circumvented with the following hack.
>
> >> img.setUrl( the_normal_url + "?" + String.valueOf(Math.Random() ) );
>
> >> Why does it work, the browser sees it as a new url so does not use the
> >> cached image, the server ignores everything after the question mark so
> >> returns the image you are after.
>
> >> There must be a better solution than this, if you know one please post
> >> here!
>
> >> good luck.
>
> >> On Jan 22, 2:48 pm, gregor <greg.power...@googlemail.com> wrote:
> >>> Hi Danielle,
>
> >>> I might have twigged what the problem is if you are getting this
> >>> problem in hosted mode. In hosted mode, the GWT dev shell creates a
> >>> temporary Tomcat instance, but it does not seem to copy the public or
> >>> client folders to that instance, only the servlets and server side
> >>> stuff. I think it just reads the client and public folders from your
> >>> source tree and loads them internally so it can run the browser
> >>> simulation via Java (so you can debug your client in Java etc). It
> >>> will only pick up the new image if you click refresh.
>
> >>> If it does not pick it up if you click refresh, but does if you
> >>> recompile, you have a more difficult problem. You need to be quite
> >>> certain on this point. You can check this yourself by creating an
> >>> Image in client for a file name that does not exist and running hosted
> >>> mode. It won't find it, and if you copy the image file to /public
> >>> whist it is still running it still won't find it. But if you hit
> >>> refresh it will.
>
> >>> Gregor
>
> >>> On Jan 21, 7:28 pm, gregor <greg.power...@googlemail.com> wrote:
>
> >>> > OK, say I have test project com.willow.sandbox.Sandbox.gwt.xml
>
> >>> > I run project in hosted mode and URL in the hosted mode browser when I
> >>> > run it is:
>
> >>> > http://localhost:8888/com.willow.sandbox.SandBox/SandBox.html
>
> >>> > I manually put an image in
> >>> > c:\....\src\com\willow\sandbox\public\images
> >>> > \star.gif
>
> >>> > I display this image in panel like so in my test GWT application:
>
> >>> > someWidget.add(new Image(images/star.gif);
>
> >>> > I run application again and It works fine. Now, still in same hosted
> >>> > mode session, I select "compile/browse". This displays my application
> >>> > in my system default browser, but as part of that process it also
> >>> > compiles all the javascirpt, HTML files etc and sets up the public
> >>> > folder - including my image, start.gif This also works, so I close
> >>> > this browser tab for now.
>
> >>> > I know open new browser tab and enter this URL (but I do *not* stop
> >>> > the hosted mode run - this won't work if you do that because the GWT
> >>> > hosted mode Tomcat will be also stopped):
>
> >>> > http://localhost:8888/com.willow.sandbox.SandBox/images/star.gif
>
> >>> > So my system browser finds and displays the star.gif image no problem!
>
> >>> > If you follow these steps (using your own paths for the URL of
> >>> > course), since we have already proved that the new image file has been
> >>> > correctly saved (because String[] photoList = photo.list(); picked it
> >>> > up), then you should be able to display the new image in your system
> >>> > browser, thus proving beyond reasonable doubt it is really there.
>
> >>> > That will further isolate your problem to either some error in your
> >>> > client side code (however unlikely that may seem since it works when
> >>> > you reboot), or something weird going on with browser caching.
>
> >>> > regards
> >>> > gregor
>
> >>> > On Jan 21, 5:27 pm, Daniele <dany.hat...@gmail.com> wrote:
>
> >>> > > I don't understand..
>
> >>> > > 2009/1/20, gregor <greg.power...@googlemail.com>:
>
> >>> > > > There's something weird about this. Have you tried (while the
> >>> > > > image
> >>> > > > is
> >>> > > > in "limbo", i.e. just after you've saved it) copying exactly the
> >>> > > > same
> >>> > > > URL string as your GWT client code produces into your browser/new
> >>> > > > browser tab?
>
> >>> > > > On Jan 20, 12:31 pm, Daniele <dany.hat...@gmail.com> wrote:
> >>> > > >> Yes.
> >>> > > >> Error is not introduced when I make the refresh through the
> >>> > > >> push-button or reboot application.
> >>> > > >> I am becoming crazy for this bug!!! :)
>
> >>> > > >> Daniele.
>
> >>> > > >> 2009/1/20, gregor <greg.power...@googlemail.com>:
>
> >>> > > >> > Have you tried hitting the refresh button rather than
> >>> > > >> > recompiling/
> >>> > > >> > deploying the application after loading new image. Does this
> >>> > > >> > make
> >>> > > >> > a
> >>> > > >> > difference?
>
> >>> > > >> > On Jan 20, 8:59 am, Daniele <dany.hat...@gmail.com> wrote:
> >>> > > >> >> Image saving on folder and String[] photo are ok! I write
> >>> > > >> >> array
> >>> > > >> >> on a
> >>> > > >> >> file when click on widget album after uploading and image name
> >>> > > >> >> it's
> >>> > > >> >> present.
> >>> > > >> >> In development shell, appears this message when I open a album
> >>> > > >> >> widget
> >>> > > >> >> after uploading of image:
>
> >>> > > >> >> Resource not found wpimg/album/Sport/image1.jpg. Could a file
> >>> > > >> >> missing
> >>> > > >> >> from the public path or a <servlet> tag misconfigured???
>
> >>> > > >> >> Obviously when I reload application, this message disappear.
>
> >>> > > >> >> Daniele
>
> >>> > > >> >> 2009/1/19, Daniele <dany.hat...@gmail.com>:
>
> >>> > > >> >> > I try!
>
> >>> > > >> >> > 2009/1/18, gregor <greg.power...@googlemail.com>:
>
> >>> > > >> >> >> so if you place a debug point here:
>
> >>> > > >> >> >> private static final long serialVersionUID = 403L;
>
> >>> > > >> >> >> public String[] getImageName(String category) {
>
> >>> > > >> >> >> File photo = new
> >>> > > >> >> >> File("src/com/webphotogallery/public/
> >>> > > >> >> >> wpgimg/album/"
> >>> > > >> >> >> + category);
> >>> > > >> >> >> //File photo = new File("wpgimg/album/" +
> >>> > > >> >> >> category);
>
> >>> > > >> >> >> String[] photoList = photo.list();
>
> >>> > > >> >> >> return photoList; <<<<<<<< DEBUG
> >>> > > >> >> >> }
>
> >>> > > >> >> >> Does the new image appear in the photoList array?
>
> >>> > > >> >> >> On Jan 18, 3:32 pm, Daniele <dany.hat...@gmail.com> wrote:
> >>> > > >> >> >>> File are saved into a folder that I choose.
> >>> > > >> >> >>> I look into a folder when application make a upload call.
> >>> > > >> >> >>> But image doesn't appear when open a album widget...
>
> >>> > > >> >> >>> 2009/1/14, Daniele <dany.hat...@gmail.com>:
>
> >>> > > >> >> >>> > I try some.
> >>> > > >> >> >>> > Thanks.
>
> >>> > > >> >> >>> > Daniele.
>
> >>> > > >> >> >>> > 2009/1/14, gregor <greg.power...@googlemail.com>:
>
> >>> > > >> >> >>> >> There's nothing obviously wrong with this, and the fact
> >>> > > >> >> >>> >> that the
> >>> > > >> >> >>> >> uploaded photo appears when you restart server supports
> >>> > > >> >> >>> >> that.
> >>> > > >> >> >>> >> Next
> >>> > > >> >> >>> >> obvious thing to eliminate may be to check exactly
> >>> > > >> >> >>> >> where
> >>> > > >> >> >>> >> on your
> >>> > > >> >> >>> >> disk
> >>> > > >> >> >>> >> the uploaded photo is actually written to. Perhaps it
> >>> > > >> >> >>> >> is
> >>> > > >> >> >>> >> not
> >>> > > >> >> >>> >> where
> >>> > > >> >> >>> >> you
> >>> > > >> >> >>> >> expect, and what is happening is that it is being
> >>> > > >> >> >>> >> copied
> >>> > > >> >> >>> >> over to
> >>> > > >> >> >>> >> the
> >>> > > >> >> >>> >> "right" location as part of your deployment/hosted mode
> >>> > > >> >> >>> >> running
> >>> > > >> >> >>> >> procedure when you restart server. If you upload a
> >>> > > >> >> >>> >> photo
> >>> > > >> >> >>> >> and
> >>> > > >> >> >>> >> then
> >>> > > >> >> >>> >> check where it goes while the app is still running, you
> >>> > > >> >> >>> >> should
> >>> > > >> >> >>> >> be
> >>> > > >> >> >>> >> able
> >>> > > >> >> >>> >> to confirm that one way or another.
>
> >>> > > >> >> >>> >> On Jan 14, 1:52 pm, Daniele <dany.hat...@gmail.com>
> >>> > > >> >> >>> >> wrote:
> >>> > > >> >> >>> >>> Code of upload
>
> >>> > > >> >> >>> >>> [CODE]
> >>> > > >> >> >>> >>> package com.webphotogallery.server;
>
> >>> > > >> >> >>> >>> import java.io.File;
> >>> > > >> >> >>> >>> import java.io.IOException;
> >>> > > >> >> >>> >>> import java.io.PrintWriter;
> >>> > > >> >> >>> >>> import java.util.Iterator;
> >>> > > >> >> >>> >>> import java.util.List;
>
> >>> > > >> >> >>> >>> import javax.servlet.ServletException;
> >>> > > >> >> >>> >>> import javax.servlet.http.HttpServlet;
>
> ...
>
> read more »
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