really need some help.
I have been working for the past 3 days trying to get a webpage to open when I run my web based Java-GWT-eclipse program. IE gives me error "Internet Explorer cannot display webpage" and chrome says "The webpage is not available- The server at gwt.google.com can't be found, because the DNS lookup failed."
I have tried this project on multiple other computers with an older eclipse-gwt plugin installed and it works great. All of these computers are dev boxes and do not have internet access. It does, however, have a solid connection to the database (SQL dev works fine).
what i have tried
copied eclipse and gwt plugin files from another dev box and installed. Gave me above error.
deleted/ uninstalled everything and installed newest version eclipse and gwt plugin. I was able to install gwt in eclipse but it could not locate GWT-user.jar file and would not allow me to create project.
Tried #2 again, same problem. Tried again on another computer, same problem.
Applied older version SDK to newer eclipse version. Gave same error as posted above/ #1.
ran wireshark on a working dev and the problem dev and the problem dev box was trying to communicate with google while the good one was going to some local IP address.
messed around with every setting in eclipse and nothing has worked.
What is left to try??? I am going insane.
What is the web page you are trying to open: http://gwt.google.com ?
Does this page load if you write the url directly in the address box of your browser ?
Does Internet work in that computer? try to access google or any other page.
This error is a clear case of a miss-configuration on your PC internet stack:
The server at gwt.google.com can't be found, because the DNS lookup failed.
What does return this command in your console?
nslookup gwt.google.com
EDITED:
After reading your comments I figure out what is happening: your browser has not the gwt-plugin installed, so the first time it connects to a gwt-dev-mode app, the app redirects it to the gwt site to download the plugin and install it.
You have either, connect this computer to the internet to install the plugin the first time it is requested, or download the plugin and install it manually.
Related
I recently began using GWT 2.7 in Eclipse Luna and I was running my projects seamlessly while testing them in localhost:8888, the thing is, when I tried to test them (any of them, even a new app with only the autogenerated content) with another device on the same local network using (pc running eclipse ip):8888 I get a message like this:
The page at (ip):8888 says: Couldn't load (app) from Super Dev Mode server at http://(ip):9876. Please make sure this server is ready. Do you want to try again?
This also happens when I try to access to the app in the pc running eclipse with (its own ip):8888.
I've checked these four similar questions, but they didn't have any really helpful answers, these are a few things I've tried or discovered already:
I enabled the 9876 port on the firewall
I've deleted the .nocache.js and .devmode.js so that they're generated again
I noticed that when this problem occurs it's because the browser can't get the (ip):9876/recompile-requester/(app) file
I tried deploying the app to GAE and it doesn't work there either, nothing that happens on the modules Java code runs (And for some reason, I get a "Uncaught java.lang.ClassCastException" message on the chrome console, but this only happens on the deployed version, it doesn't happen on localhost:8888 or in (local ip):8888)
But nothing has worked and the four questions I mentioned are pretty much the only things related to this I've found, so I really don't know what else to try.
As Thomas pointed out, the problem I had was that from GWT 2.6 onwards, if you want to test from other devices in the same network, you have to whitelist the addresses you'll be using in each *.gwt.xml file using a command line like this:
<set-configuration-property name="devModeUrlWhitelistRegexp" value="http://(localhost|127\.0\.0\.1|192\.168\.150\.(\d{1,3}))(:\d+)?/?.*" />
I also had to add a -bindAddress 0.0.0.0 attribute to the run config for it to work.
I am using IBM Mobile Test Workbench for Worklight 8.5.10 plugin for Eclipse and I am trying to add a device using my PC. I've done the same process on a Mac and it works fine no issues. However on my PC when I go to the Workbench URL in a browser, phone, or emulator I go to start the download and I receive this on all devices...
HTTP ERROR: 404 Problem accessing
/android/client/com.ibm.rational.test.mobile.android.client.ui-release.apk.
Reason:
Not Found
Does anybody have any idea why I would be getting this?
a good idea would be to check if your firewall is not blocking port 7878 or 8080 (the ones that are used by MTWW to communicate between device and workbench)
simple test for that : stop your firewall for 5 minutes, retry
if it works, it mean you'll have to configure this firewall to open this port
if you can't open this specific port, you can configure MTWW to change the default communication port (to use one that is open in your firewall) like this :
in MTW, open : windows => preferences => Test => performance Test
Report => Web report
check "Allow remote access from a web browser"
check "no security is required to access reports"
change value of "non-secure port" (default = 8080)
when done, it would be better to restart MTWW before retrying
if all of this fail, last solution is to manually install the client apk
apk is located there :
[IBM shared dir of your install]\plugins\com.ibm.rational.test.mobile.android.runtime_[some version number]\client
apk to install : com.ibm.rational.test.mobile.android.client.ui-release.apk
the simpler is use "adb connect [your device ip]" (if adb is not yet connected to your device), then "adb install [apkname]"
Jerome B.
After much trial and errors I finally fixed my issue. Here's the last thing I did to get it working. I uninstalled everything from Java, Eclipse, and IBM. I then reinstalled everything and placed Eclipse in My Documents and I changed Java versions to 1.6. After all of that it seems to be working fine. It doesn't make much sense.
i am only start learning GWT by following their tutorial on https://developers.google.com/web-toolkit/doc/2.1/tutorial/create
On that page, when i reach the heading Running the development mode code server (from Eclipse), i copied the generated url http://127.0.0.1:8888/StockWatcher.html?gwt.codesvr=127.0.0.1:9997 to my browser.
It eventually times out, says page not loading...the plugin page did not show up initially, so i manually installed the plugin...but it still times out...
On the screen, it says...
===============================================================================
The connection was reset
The site could be temporarily unavailable or too busy. Try again in a few moments.
If you are unable to load any pages, check your computer's network connection.
If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web
==============================================================================
Am i missing any configurations etc?
Thanks very much in advance
It still looks like your browser is missing the GWT developer plugin. Try a different browser (preferably Chrome). You can also check the instalation of GWT in Eclipse. Look into Windows/Preferences and under Google/WebToolkit you should see checked GWT SDK. Also you can check if a jetty server runs on port 8888, when you type "netstat -na" on the command line.
I have deployed my GWT application to its target environment (i.e. compiled and copied the war directory contents to the target device's /var/www) and some parts of it are not working. I understand that I can debug my local instance of the GWT app as if it were running in the target environment, by opening the deployed GWT App URL and adding gwt.codesvr URL parameter to it, like this:
http://deployment_host/gwtapp.html?gwt.codesvr=localhost:9997
I get
Plugin failed to connect to Development Mode server at localhost:9997
Follow the underlying troubleshooting instructions
My Chrome browser is running on the same machine as Eclipse, so localhost above should be ok. Just to make sure, I've added -bindAddress 0.0.0.0 in the Run/Debug configuration in Eclipse and tried with my external IP/hostname, with no change, except that the error message is updated accordingly. What am I doing wrong?
If I replace deployment_host with localhost above everything works fine, but it's of no use to me to debug locally. (There is some Proxy and ReverseProxy-ing going on in the local Apache, so I do not need the 8888 port when running locally, but this should be unrelated)
Questions Debugging GWT applications outside of dev mode? and Debug GWT application in a remote browser are related but do not help.
If you are using chrome, look in the address bar at the right for a grey GWT icon. In any other browser, you would see a popup message confirming that you want to debug, but in Chrome this apparently isn't possible.
Click the icon, and it will ask you to whitelist this site as allowed to run Java locally on your computer. After you whitelist it, it should run correctly.
Along the same lines as the answer above Ive just had some success restarting the extension helped (but restarting browser hadnt)
Just enable and disable it in :
chrome://chrome/extensions/
Good luck! It's the only thing wrong with GWT imho...
I am using GWT 2.3.0 as a plugin for Eclipse to develop a web based application
Unfortunately, when I try to run my application I get:
plugin failed to connect to developer mode server at 127.0.0.1:9997
and
onModuleLoad() threw an exception :java.lang.reflect.InvocationTargetException
I have installed the Gwt developer plugin for Google Chrome and every time I run my project it requires me to install this plugin and restart the browser, after which I get the above mentioned problem.
You can solve this issue by:
Right click on your web project -> Run as -> Run configurations.
Select 'Server' and 'GWT' tabs respectively and check on 'Automatically select an unused port'
Clear Cache from your Chrome browser (do the same on Firefox if you are using Firefox, remember the GWT plugin is not available on the latest Firefox versions, 3-10 I believe).
Run and hopefully enjoy.
I know it's an old question but,
I ran into the same problem today.
For some reason (quite unknown to me) deleting the ":9997" from the end of the address fixed it, and the application came up nicely.
Hope this helps.
Look at http://notepad2.blogspot.com/2010/12/debug-google-web-toolkit-applications.html for a step by step instruction on how to set up chrome, particularly the last part on how to setup the plugin using an external web server.
For the first problem that you faced : plugin failed to connect to developer mode server at 127.0.0.1:9997 , just clear your browser cache and try once again.
Just happend to me today too, and I've managed to fix it:
It turns out that the set of the GWT modules to be loaded is configureable; by referring to one of the GWT html's from the browser, it appears I was actually trying to connect to a page under a module that has been removed from the run-config's modules list. So, one more thing to do is to verify the list's content:
In eclipse: "Run Configurations" > Web Application > (your app) > GWT tab > Available Modules
In IntelliJ (that's what I've used): Edit Configurations > (select your GWT config) > GWT Modules to load
The GWT Plugin may be need to restarted
First Clear Browser cash
Second : try the following on chrome browser
-
open : chrome://extensions/
Go to : GWT Developer Plugin
uncheck the Enabled box
check the Enabled box
Open URL again and have fun :)
I fixed the issue by only clearing the browser cache. I am working with Firefox 15.0.1