Eclipse plugin:TextSelection cannot resoleve

I am trying to develop my first plug-in.

The plug-in should manipulate the content of the selected text in the active text editor.

I started with the “hello world” example from the “Cheat sheet” which worked perfect.

When tried to modify I found that project not recognizing many types.

I added the following jars to the project build path libraries:

• org.eclipse.jface.text_3.5.1.r351_v20090708-0800.jar
• org.eclipse.text_3.5.0.v20090513-2000.jar
• org.eclipse.ui.editors_3.5.0.v20090527-2000.jar

Now code compiles perfect.

1. ISelection iSelection = null;
2. IEditorSite iEditorSite = window.getActivePage().getActiveEditor().getEditorSite();
3. if (iEditorSite != null) {
4. ISelectionProvider iSelectionProvider = iEditorSite.getSelectionProvider();
5. if (iSelectionProvider != null)
6.   {
7.    iSelection = iSelectionProvider.getSelection();
8.    selectedText = ((ITextSelection)iSelec开发者_如何学Ction).getText();
9.   }
10. }

The problem is in line 08. although eclipse recognize the ITextSelection interface, at runtime I get cannot resolve type exception.

When trying to deploy the code I get the following line in the deploy log:

The import org.eclipse.jface.text cannot be resolved

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Did you try, in the Run configuration dialog, to open the "Plugins" tab and click the button "add required plug-ins" ?

It might add the right runtime dependencies for you.

See also that same button in the dependencies tab of your plugin project:

alt text http://www.vogella.de/articles/RichClientPlatform/images/product50.gif

(more in the article "Products and Branding")

See also this SO answer for more checks.