/**
* Construct a new StartMIDletMonitor instance to track the
* process of starting a MIDlet in a new Isolate.
* The new instance is appended to the startPending vector
* and is registered with the MIDletProxyList to receive
* notifications if/when the MIDlet starts/fails to start.
*/
private IsolateMonitor() {
isolates = new Hashtable();
listeners = new Vector();
midletProxyList.addListener(this);
}