AWS Toolkit for Eclipse Luna 4.4.1 does not install - eclipse

I have Eclipse Luna 4.4.1. While trying to install AWS Toolkit from the url, http://aws.amazon.com/eclipse or from Eclipse marketplace url https://marketplace.eclipse.org/content/aws-toolkit-eclipse#group-external-install-button (using drag and drop button), following error happens,
Unable to read repository at http://aws.amazon.com/eclipse/site.xml/content.xml.
Unable to read repository at http://aws.amazon.com/eclipse/site.xml/content.xml.
peer not authenticated
Sometimes it lists down the components available for install but everytime it fails with above error. One thing I noticed is content.xml urls does not seem to be valid or are being interpreted as a invalid URL.
Request help.
Regards

An incorrect URL is specified for the Eclipse Marketplace item AWS Toolkit for Eclipse (the URL should not end with site.xml).
Instead of using drag and drop, you have to use Help > Install with the correct URL http://aws.amazon.com/eclipse/

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Unable to read repository at https://ecd-plugin.github.io/update/content.xml in Eclipse

I am trying to install decompiler in Eclipse Mars but I am getting Unable to read repository at https://ecd-plugin.github.io/update/content.xml everytime. I tried to install any other plugins too from the marketplace but I got same error. Also i tried to access the url from Eclipse Internal Web Browser and I am able to access the page. Not sure why i am getting this error.Any help or suggestion will be appreciated. Thanks.

Unable to download Glassfish tools for Eclipse Kepler?

I'm using STS based on Kepler 4.3.2. I am not able to download support for Glassfish from the Oracle site. Whenever I try to download via Eclipse Marketplace, I get this error message:
"No repository found at http://download.oracle.com/otn_software/oepe/kepler."
Could someone please enlighten me what the problem is with the site?
Installation (using the Install button, dragged to running Eclipse workspace) from http://marketplace.eclipse.org/content/glassfish-tools-kepler works for me.
If the p2 repo is not available on download.oracle.com (it could be a glitch), you can always download the latest p2 repo and use it offline.
See the last "Oracle Enterprise Pack for Eclipse (12.1.3.1)" (or a previous release), and download a repo like:
http://download.oracle.com/otn_software/oepe/12.1.3.1/luna/oepe-12.1.3.1-luna-repository.zip
Or, for Kepler, an older one:
http://download.oracle.com/otn_software/oepe/12.1.2.3/kepler/oepe-12.1.2.3-kepler-repository.zip
(you must do it from the web page, after accepting the license)

Error: Could not find or load main class com.google.gwt.dev.Compiler

What steps will reproduce the problem? and how i can solve this problem
IN Eclipse Indigo, right click on project name --> google --> GWT Compile --> Compile
I got error that says
GWT compilation failed
In Eclipse console window, I got error message that says
Error: Could not find or load main class com.google.gwt.dev.Compiler
I am using windows 7 , eclipse juno 4.2 , and GWT sdk 2.5.1
During Gwt installation i left unchecked all app engine SDK options.
And also configure build path for jar files for projects i have.
but still this problem is coming .
Thanks for answering . well I tried that before but nothing happened. Then I uninstall all all. And go to HELP--->Install new Software---> in text area i used this link Google Update Site for Eclipse 4.2 - http://dl.google.com/eclipse/plugin/4.2 then whenever i checked Google Plugin for eclipse (required) and hit next it shows Cannot complete the install because one or more required items could not be found.
Software being installed: Google Plugin for Eclipse 4.2 3.2.4.v201306061638-rel-r42 (com.google.gdt.eclipse.suite.e42.feature.feature.group 3.2.4.v201306061638-rel-r42)
Missing requirement: Google Plugin for Eclipse 4.2 3.2.4.v201306061638-rel-r42 (com.google.gdt.eclipse.suite.e42.feature.feature.group 3.2.4.v201306061638-rel-r42) requires 'org.objectweb.asm 0.0.0' but it could not be found i didn't understand what and where is the problem coming .
I would double check your GWT install. Right click on a project in eclipse, and select Properties. Then under the Google option, click Web Toolkint. On the panel to the right there should be an option "Use Google Web Toolkit". Make sure that is checked. Also Click "Configure SDKs", and ensure that the selected SDKs are indeed pointing to the correct file location. Finally, Make sure that your entry points are correctly added in the "Entry Point Modules" panel.
I was facing the similar problem. I changed the proxy of my eclipse to manual and put in proxy settings for HTTP, HTTPs and port as 8080. This allowed the eclipse to connect to the network and download the required plugins. Try this out and let us know if it helps.

Unable to contact Juno download site

I am trying to download m2e for Eclipse Juno but for some reasons I have problems contacting the update site.
I was not able to download from the marketplace, which claimed dependencies are missing.
Then I tried to use the Juno update site (under install new software...) but received this error :
Unable to read repository at http://download.eclipse.org/releases/juno/.
Unable to read repository at http://download.eclipse.org/releases/juno/.
No repository found at http://download.eclipse.org/releases/juno/201209280900.
What is the solution?
The solution I found was to a use the site shown in the error with the addition of '/'
http://download.eclipse.org/releases/juno/201209280900/

Where is the TestNG eclipse plugin

Where to find 5.x Testng eclipse plugin
Problem Installing older TestNG plugin on Eclipse 3.5
Both questions are quite old so the links there do not work anymore. I have Eclipse 3.5 and I would like to install the Eclipse TestNG plugin. What is the location of the update site? I am moving to TestNG so I can move the latest version of TestNG
PS: I have tried http://beust.com/eclipse/ but it throw me an NPE as shown below
Try to download TestNG plugin from Market Place.
Eclipse - > Help - > Eclipse MarketPlace -> TestNG..
Install it. After restarting Eclipse use it.
Try the URL that the jar comes from: http://beust.com/eclipse/
Use that above link as the Location, make sure to include the http://.
I used the latest url posted on the following page http://beust.com/eclipse-old/
That is http://beust.com/eclipse-old/eclipse-6.7.0.20120825_1316/
It worked perfectly fine.
Your URL looks fine (http://beust.com/eclipse) hence I suspect an issue unrelated to this, maybe your Eclipse installation is buggy or incorrectly configured (I did not need any special config on my Eclipse install though).
IN windows how to install testng plugin in Eclipse:
1. Open Eclipse
2. Click on Help at top menu
3. Click on Install New Software... sub-menu
4. Click on Add button
Do the following at Add Repository pop-up:
5. Enter name as (Example - testng)
6. Enter URL as your requirement:
For Eclipse 3.4 and above, enter http://beust.com/eclipse
For Eclipse 3.3 and below, enter http://beust.com/eclipse1
7. Click on OK button
8. Check process bar is displayed because plugin is installed in eclipse
After installation follow the steps below:
i) Restart eclipse
ii) Go to Window-> Preferences and observe the left panel
iii) TestNG is enlisted
I noticed it was proxy that was stopping for installation after configuring proxy it installed like cream.
earlier comment:
After a lot of attemp and trying different URL finally found the URL worked for me : http://beust.com/eclipse-old/eclipse-6.7.0.20120825_1316/
all other URL kept on giving error for MD5 example:
An error occurred while collecting items to be installed
session context was:(profile=epp.package.jee, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
Problems downloading artifact: osgi.bundle,org.testng.eclipse,6.9.11.201604020423.
MD5 hash is not as expected. Expected: da03b0c2cd24e2636ad05a151538b195 and found 60ea74539d11470e704c4210de6e5573.
Problems downloading artifact: osgi.bundle,org.testng.eclipse.maven,6.9.11.201604020423.
MD5 hash is not as expected. Expected: 91946a86a2a3ae80d8583be62a9fe068 and found 0f70e9fd8a1bb2564f26bc4730a58922.
if the link: http://beust.com/eclipse/ is not working for versions 3.4 and above, there could be some problem with the Network Connections of your eclipse.
Go to Window->Preferences-> search for SSL or Network Connections.
Check if the settings for the same are in place as per your internet/intranet.
open Eclipse
CLick on Help at top navigator
Click on install new software
Click on add Button
Add Repository pop-up is open
Enter name as (Example - TestNG)
Enter URL - http://beust.com/eclipse
Click on OK button
Check process bar is displayed because plugin is install in ecplise
After restart the eclipse
Check Testng is install in ecplise
For eclipse Luna - http://marketplace.eclipse.org/content/testng-eclipse/metrics
Drag and drop the install icon to the eclipse workspace and follow instructions.
Works like charm.
In my case, looks like updates for Eclipse was the issue.
I just installed the updates to my eclipse (Luna Service Release 2 (4.4.2) Build id: 20150219-0600) and restarted Eclipse.
Then, went to help->Eclipse Marketplace-> searched TestNG and Installed it.
This worked for me.
The given site "http://beust.com/eclipse" gets redirected to
http://dl.bintray.com/testng-team/testng-eclipse-release/
because of that eclipse fails to fetch the plugin in the original URL.
to fix that, go to help->install new software
now add new site at work with
"https://dl.bintray.com/testng-team/testng-eclipse-release/"
it is "https", doing this will list down the plugins available in the URL,
select TestNG, and continue to install it.
it worked for me, hope it works for you as well.