I developed a java plugin using Eclipse Indigo Release and deployed it in to a jar file. When I put it in plugins directory in the same eclipse.exe which I used to develop the plugin, I was able to work with the new plugin.
But the problem is when I downloaded the new version form website(Eclipse Indigo Service Release 1) and install the plugin(drop in plugins directory) I couldn't find the installed new plugin (my plugin adds a new perpective and it doesn't show up).
Help -> Install New Software searches for a site.xml which contains the info about the features and plugins present in the local update site
for eg your update site should be like MY_UPDATE_SITE
|->features/my_feature.jar
|->plugins/my_plugin.jar
|->site.xml
Here you need to actually browse and select the MY_UPDATE_SITE folder and not any jar
And about ur plugin problem definetely there is some dependency missing