pluginManager = new GridClientPluginManager();
pluginManager.loadPlugins();
// Tell the engine how to find tokens by defining an
// attribute selector, which stores tokens in the token cache
engine.setAttributeSelector(new DefaultAttributeSelector(tokenCache));
// Tell the engine to use a federation selector, which finds
// management context (SLAs, Trade Accounts) when invoking an
// operation.
engine.setFederationSelector(new DefaultFederationSelector());
// The proxy factory creates proxy object from