Plugins installed on Eclipse not visible

When I install a plugin in Eclipse everything goes well. But after restarting the new plugin is not visible. I have tried it with 开发者_StackOverflowdifferent plugins, but they have all the same problem. The only place where I can see them is when I look at "What is already installed?".

What could be the problem?

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This issue and its solution is described in a DZone article and at the nWire blog.
It all boils down to these two options:

• Install Eclipse to a folder where your user has full rights or
• Start Eclipse as an administrator

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sudo eclipse -clean;  

Help --> Install software --> Re-install the plugins and software;

Explanation:
Eclipse is installed and the majority of programs are also installed initially with root privileges.

Typically 'Ownership' of hidden install folders like this belong to the 'Sudo' or Root user. Therefore changes and installs to these hidden folders will not take.

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Have you tried running Eclipse with the -clean argument ? You need to do this only once and not every time you start Eclipse, you it is recommended to do so after a plugin installation.

If that doesn't help, verify if you have privileges to write onto the features and plugins subdirectories. The plugin installation process requires the write privilege, but I've never seen a plugin installation succeed without one; still, it is worth checking for.

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I had a problem one time where I was running eclipse with an old jre - it worked but plugins that needed jre6 didn't load. Do you have a recent jre in your path and as your java_home?

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I recently installed a plugin which I no longer needed. Adding to @VonC , I found my plugins are under /.eclipse/org.eclipse.plaform.xxxx/features and /.eclipse/org.eclipse.plaform.xxxx/configurations folders.

Hope this helps !!

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You could be in a custom perspective in which the plugin commands are not set to be visible (hence no menu, no view, ...). See this question for more on perspectives.

Can you see your plugins in the <eclipse>/plugins and <eclipse>/features directories?
Can you check your "Error Log" view and see if there is any error message?
Can you see if the Preferences reference your plugins?

You can also try re-launching Eclipse with the -clean command line argument

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I had similar issue and in my case Eclipse was starting up using an older version of Java. The Oozie plugin requires 1.8 Java version. Starting up Eclipse using the 1.8 version Java fixed it for me.