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Eclipse RCP: Required plugin could not be found

I am new to Eclipse RCP and plugin development so please don't be cruel.
I am using Maven and I have a remote repository. Yesterday Eclipse was fine but today it got messed up and I imported all the projects again so I reconfigured all but I can't get out of this problem. We use e(fx)clipse 2.5 but I installed the 3.0 version of it because I didn't find the link to install it via Eclipse.
Could you please tell me how I add a dependency? There is something that I am missing there?
Thank you

Adding the location http://download.eclipse.org/releases/oxygen/ to your target platform should fix the errors.

Not able to install M2eclipse plugin in NEON Eclipse

I have installed Eclipse Neon Milestone 4, Java 8, and Apache Maven 3.3.3 on my windows system. I am trying to install plugin :: M2E - Maven Integration for Eclipse 1.6.2 in eclipse. I am getting error -
Cannot complete the request. See the error log for details.
"m2e - Maven Integration for Eclipse (includes Incubating components)" will be ignored because a newer version is already installed.
But When I look in "Installation detail" I can't see Maven plugin there. Also no Maven menu option is coming when I am right clicking the project.
Please help to proceed.

I just ran into this problem too. I'm using the same version of Eclipse, etc. It turns out that the "fix" was kind of subtle. When you go an install new software under the help option using "http://download.eclipse.org/technology/m2e/releases", then you select the maven option. On the next screen they say here's what your downloading...
I had to select the two items by highlighting them then press next and agree to the licenses for m2eclipse to install correctly. The first time when it didn't work I thought, okay great that's what I need, and then nothing happened. Hopefully that helps, I realize you're getting this answer about 10 months after you asked for help.

Dynamic Web Project - Project Facets not displaying CDI as a project facet

I'm trying to add CD,I as a project facet to a Dynamic web project. But when clicking on the project facets view there is no CDI option in the Project Facet list as you can see:
I tried following this suggestion in where they said to erase possible conflicting jres, and also the suggestions in here which recommends checking the installed jre's, my view of installed jres is:
I'm at linux mint so I'm also attaching a screenshot of the dir /usr/lib/jvm, in case you guys see any anomaly in it and also it seems my java version is okay:

Did you installed JBoss Tools?
Go to Help -> Eclipse Marketplace find JBoss Tools for your version of Eclipse (To check version of eclipse go to Help -> About Eclipse)
Then select plugin you need
UPD
And also check Runtime Environments (window -> preferences)
Eclipse should be restarted after installation

eclipse: No "Maven" entry for Windows / Preferences

I had eclipse Juno running; I decided to upgrade to eclipse Kepler. I only had Java 1.6, so I downloaded and installed java 1.7, and changed my JAVA_HOME. I downloaded and unpacked Kepler and pointed it at my existing workspace.
I have two questions; First, when I click on "Window / Preferences", there is no entry for "Maven" on the left of the dialog. I shut down and rebooted the machine after I changed JAVA_HOME to ensure that didn't cause this.
I checked the list of installed plugins, and it lists m2e (v1.4).
Second, I am getting an error message "Plugin execution not covered by lifecycle configuration". There are a double-handful of sites indicating what to do about this, including the m2e's wiki pages, but over half the suggestions don't look reasonable, the wiki doesn't spell out what to do for its recommended solution, assuming you know, and the one that looked most promising to me involves using "Windows / Preferences / Maven".
So I'm most interested in the answer to the first question; if you have hints to offer on the second, I'm all ears...

Here are the things you can try:
Start Eclipse with the -clean switch
Uninstall / reinstall the plugin
Delete the plugin's files physically from the plugins folder and install it again from the Marketplace
If all else fails you can just get a fresh installation of Eclipse and reinstall your old plugins manually. There are some of them which won't work in a newer version of Eclipse (I remember for example that I had to install WindowBuilder all over again after an Eclipse version switch).

I believe this came about by installing a new version of eclipse but pointing it at a workspace for the previous version. I have been told that there is metadata attached to a workspace that has to do with plugins; this would be bound to cause problems for a version that didn't have the plugins. I eliminated the new install, installed it again, created a new workspace, and imported-with-copy the project I wanted, that has eliminated the error. I will pursue that further.
Thanks to Adam Arold who pointed out the metadata issue.

No Android project type in Eclipse->File->New-Project

I am running CentOS 5.5 x86_64 with JDK 1.6, Eclipse Galileo, and the 0.9.7 ADT is installed; however, after installation, the Android project type is not available. I have checked in the installed packages list and it is installed. Anybody encounter this problem before? Could it be due to my use of the 64-bit java VM that is installed on my system?

This usually happens when you dont select any android SDK in "Preferences > Android" You just have to reset the perspective in eclipse, Windows > Reset Perspective.
Hope this is still helpful.

Hope you have already set the Android Preferences if not Window -> Preferences-> Android and browse to the android SDK folder.
In rare cases even after doing this step, Android Project option doesn't show up in File -> New. But you can get it by File -> New -> Project .. and choose the android project from the options displayed.

Ok. I reinstalled eclipse and android. I think the problem was that I hadn't unpacked the android tools first. The plugin was installed, but it had nothing to talk to! Anyway, all the android related stuff now shows up in Eclipse.

Using Windows 7, 64-bit edition, with the latest Eclipse (Indigo) and the latest ADT plugin, I had the exact same problem. No Android project type, no Android in Windows/Preferences.
Like #Rubberman I solved the problem by totally re-installing Eclipse. Eclipse doesn't seem to use the standard Add/Remove Program stuff in Windows; I just deleted the Eclipse install directories and my Eclipse workspace directory, re-installed Eclipse, and re-installed the ADT plugin.
I would have liked to have just removed the plugin and re-installed without deleting the whole of my Eclipse install, but I couldn't figure out a way to do that. I don't see any way to remove a plugin, and when I tried to choose ADT for installation Eclipse gave me an error, saying "I can't install that because it is already installed."

I Know its a very old post..but still it may help someone with same problem...
I wanted to jst share that we can uninstall the plugins without the need of reinstalling eclipps..by simply going to 'already installed application' link and selecting all the android related options and simply clicking on uninstall button..Now you can add fresh android sdk to your ecllips..I have tried it and it works..
Hope, I helped aomeone..:-)

Ok, been looking for the answer to this for an hour, it's not well mentioned.
if you are using linux then you need to add 2 more things to install ADT correctly:
GEF from http://download.eclipse.org/tools/gef/updates/releases
WST Server Adapters from http://download.eclipse.org/releases/galileo/ (modify for your release)
do it the same as the adt plugin install.
maybe you need to uninstall then reinstall the adt plugin after?
sources:
ubuntuforums.org/showthread.php?t=1595684
sonalsantan.blogspot.com/2010/10/eclipse-adt-plugin-on-ubuntu-1010-after.html

You have to install the Eclipse plugin called ADT.