public static ScriptingEngineFactory getScriptingEngine() {
if (_scriptingEngine == null) {
try {
Class factoryClass = Class.forName( _scriptEngineClassName );
final ScriptingEngineFactory factory = (ScriptingEngineFactory) factoryClass.newInstance();
_scriptingEngine = factory.isEnabled() ? factory : NULL_SCRIPTING_ENGINE_FACTORY;
_scriptingEngine.setThrowExceptionsOnError( _exceptionsThrownOnScriptError );
} catch (ClassNotFoundException e) {
disableScripting( e, "Unable to find scripting engine factory class " );
} catch (InstantiationException e) {
disableScripting( e, "Unable to instantiate scripting engine factory class " );