MessageBox doesnt appear when eclipse plugin has been deployed? - eclipse

Question

I have written an Eclipse plugin and I have added option for help in Eclipse "Help" menu. On click of that help the MessageBox appears.
This MessageBox appears when i run or debug by Eclipse application however when i deploy this plugin on other PC and click help the MessageBox doesnt appear.
This is my code:
public class MyHelp implements IWorkbenchWindowActionDelegate {
public void run(IAction arg0) {
try {
String message = "This is demo data";
// TODO Auto-generated method stub
MessageBox box = new MessageBox(new Shell(), SWT.OK);
box.setMessage(message);
box.setText("Help title");
box.open();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
Can anyone help me out with this one ..?
For help I have added an ActionSet in my plugin as :
<extension
point="org.eclipse.ui.actionSets">
<actionSet
id="com.my.plugin.actionSet"
label="My ActionSet"
visible="true">
<menu
id="mymenu"
label="My Menu"
path="help/helpStart">
<groupMarker
name="start">
</groupMarker>
<separator
name="additions">
</separator>
</menu>
<action
class="com.myexample.MyHelp"
id="MyHelp"
label="Use Help"
icon="icons/plugin_help.png"
menubarPath="help/mymenu/start"
style="push">
</action>
</actionSet>
</extension>
Do I need to do anything else ?

Answer 1

If you are running eclipse >= 3.3 then you may drop it to plugins folder. Also, try to restart your eclipse with -clean option.
I'd suggest you to user dropins folder for manual installation. Please, refer to the documentation: http://wiki.eclipse.org/Equinox_p2_Getting_Started#Dropins
Upd1:
In order to run your code I had to add some unimplemented methods (I am using eclipse version 3.6):
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.MessageBox;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.IWorkbenchWindowActionDelegate;
public class MyHelp implements IWorkbenchWindowActionDelegate {
public void run(final IAction arg0) {
final String message = "This is demo data";
// TODO Auto-generated method stub
final MessageBox box = new MessageBox(new Shell(), SWT.OK);
box.setMessage(message);
box.setText("Help title");
box.open();
}
public void selectionChanged(final IAction action, final ISelection selection) {
// TODO Auto-generated method stub
}
public void dispose() {
// TODO Auto-generated method stub
}
public void init(final IWorkbenchWindow window) {
// TODO Auto-generated method stub
}
}
Also, check your plugin MANIFEST to have following line:
Bundle-SymbolicName: your_plugin_id;singleton:=true
I've just copied plugin from the workspace into the dropins folder of my eclipse instance and it was working out of the box.
Are you sure, that plugin manifest is in the jar file? Check out the Bin tab or build.properties to be sure, that everything is exported correctly.
Hope this helps