I've done quite a bit of research and can't seem to find why this isn't working. What I have is Cordova based Android app in Eclipse running Cordova 2.7.0. I want to build a simple plugin that just alerts the user when it has completed.
My index.html
    <head>
    <script type="text/javascript" src="cordova-2.7.0.js"></script>
    <script>
        window.func = function(str,callback){
            alert("Outside Call Working");
            cordova.exec(callback, function(err){alert(err)},"HelloPlugin","echo", [str]);
        }
        function callPlugin(str){
            alert("JS Working");
            window.func(str,function(){
                alert("Done!");
            });
        }
    </script>
</head>
<body>
    <h2>PluginTest</h2>
    <a onclick="callPlugin('Plugin Working!')">Click me</a>
</body>
My config.xml line where I add the plugin
<plugin name="HelloPlugin" value="org.apache.cordova.plugin.HelloPlugin" />
And my actual plugin HelloPlugin.java that is in src/com/example/plugintest right next to MainActivity.java
package com.example.plugintest;
import org.apache.cordova.api.CallbackContext;
import org.apache.cordova.api.CordovaPlugin;
import org.json.JSONArray;
import org.json.JSONException;
public class HelloPlugin extends CordovaPlugin{
    @Override
    public boolean execute(String action, JSONArray args, CallbackContext callbackContext) throws JSONException {
        /*if(action.equals("echo")){
            String message = args.getString(0); 
            callbackContext.success(message);
            return true;
        }*/
        callbackContext.success(action);
        return true;
    }
}
Any help is greatly appreciated!
In this line
    window.func = function(str,callback){
        alert("Outside Call Working");
        cordova.exec(callback, function(err){alert(err)},"HelloPlugin","echo", [str]);
    }
put like this
window.func = function(str,callback){
        alert("Outside Call Working");
        cordova.exec(callback, function(err){alert(err)},"org.apache.cordova.plugin.HelloPlugin","echo", [str]);
    }
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