Eclipse AsyncCallback failed - gwt

I'm new at this place, please excuse me if this question is a random question :)
So my problem is I Installed:
Eclipse Oxygen
Google Cloud Platform / App AppEngine
MySqlConnector is in place
Evertime when I start my programm with right click -> Run As-> GWT Development Mode with Jetty eclipse is showing me some errors like "RPC Call failed etc."
My prof. said for the GWT login this is normal but how can I test all my other methods which I wrote with the AsyncCallback? enter image description here
I hope someone could help me :/
I thank you in advance.

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nothing I have found so far helped me. I am trying to Import a Gradle Project (libGDX Project to be exact) into Eclipse Photon but the only thing I get is the following :
On my other Notebook everything worked fine. On this one here I have JDK 8 installed. Does anyone know what's going on ?
Before I tell you what I think is wrong, have a good look at the error message. Eclipse is basically telling you it tried to find something, in this case a plugin, and couldn't.
As the error message says, you need to install the gradle gwt plugin in order to import gradle projects. To do this, open up the plugin market place, search for "gradle gwt", (in general) download the most popular one, and follow the installation process.
I hope this answer helped you! If you have any other questions about this answer, feel free to leave a message below.

Roku - Brightscript on eclipse is not working

Now I'm learning Roku's BrightScript. I found eclipse is a good IDE for BrightScript development. But I'm not sure, should I register in their Roku's developer website? I have a sample code. When I used to run the code , it is showing this
I just followed their instructions from here.
I don't know, how to solve this problem. I don't know why this is coming. Please help me to solve this issue.Also, you can give me the right direction for BrightScript development. And it is more appreciable.
Here are the details.
Eclipse: Eclipse IDE for Java Developers
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Thank you
If you are not already a heavy user of Eclipse, installing that just for Roku would be undue pain and suffering. For more keep an eye on http://forums.roku.com/viewtopic.php?f=34&t=95340
The good news is there is no secret sauce in Eclipse - you can do BrightScript development with any favorite IDE of yours that supports VB Script syntax highlighting + manual (or trivial script) packaging and upload to Roku player.
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I downloaded and installed tomcat 6.0. I am using rational application developer. I am not able to see my tomcat server in my IDE at all. I tried server->new-> and windows->preferences->server->server runtime environment but I don't find it here either. Any idea where I am going wrong or which step i missed? I know i installed my tomcat properly because http:localhost:8080 works properly.
thanks in advance!!
UPDATE
Will a trial license affect my servers in any way? Like only a specific server you can use with the IDE while u have a trial license or something like that?
UPDATE
when I click Add, Tomcat isn't there in the list of options for me to select and that is where my problem arises. I tried clicking on search and the selecting the tomcat folder but i get an error that states - No new server runtime found
I had the same issue and I followed these steps to solve it in Eclipse Helios:
Help -> Install New Software
Choose "Helios - http://download.eclipse.org/releases/helios" site
Expand "Web, XML, and Java EE Development"
Check JST Server Adapters (version 3.2.2)
Please change the download URL in step 2 according to the Eclipse version which you are using.
Hope this helps.

Eclipse RAP Installation

I a newbie with eclipse RAP, I see this how-to for installing Eclipse Rap http://www.vogella.com/articles/EclipseRAP/article.html
but when i click on Launch a RAP Application I see this error
HTTP ERROR 404
Problem accessing /rap. Reason:
ProxyServlet: /rap
Powered by Jetty://
In Console I see this in red:
2012-04-17 10:27:14.890:INFO:org.mortbay.log:Logging to STDERRorg.mortbay.log via
org.mortbay.log.Slf4jLog
2012-04-17 10:27:15.134:INFO::jetty-6.1.x
2012-04-17 10:27:15.279:INFO::Started SelectChannelConnector#0.0.0.0:51074
I press F5 in browser but nothing, I change the port but nothing.
I don't know what the problem is.
I use win7 64 bit and use Eclipse for RCP and RAP Developers:
Version: Indigo Service Release 2
Build id: 20120216-1857
I installed eclipse on Debian system and I see usual error now I undestand where is the problem?
can you help me?
I had the very same problem and found help in the following Eclipse Community Forum post:
http://www.eclipse.org/forums/index.php/m/987645/?srch=SelectChannelConnector#msg_987645
According to this, there is some trouble with the RAP version in the "Eclipse for RCP and RAP development" distribution. Instead I downloaded Eclipse classic and installed the RAP Tools 2.0 manually via "Help -> Install new software..." from http://download.eclipse.org/rt/rap/tools/2.0/. Having installed these tools and restarted Eclipse, the welcome page now has a RAP link I used to install and activate the RAP target platform.
After this trouble, my RAP projects worked. You might still get 404 errors, but now refreshing the page works. I hope this information helps you!
Bug 282756 - [Tooling] Browser is opened too early
From time to time the browser opened by the launcher is opened too early and the user is confronted with an error page.
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=> The solution is to press the refresh button on the browser.

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Try this in Netbeans:
Click menu-item: Tools->Java Platforms
Click button: Add platform...
Choose radio-button: Java ME MIDP Platform Emulator
then click button: Next >
Find the directory where Netbeans 6.7.1 is installed
then click OK
WTK2.5.2 that comes with Netbeans should be visible. Select it and click Next and follow further instructions.
If no WTK is found the dowload it, unpack it and try as above again but find the directory to the WTK this time.
Hope this helps.