logger.debug(RESPONSE_TYPE + ": " + responseType);
Assert.assertNotNull(getEngineInstance(), "It's not possible to execute " + this.getActionName() + " service before having properly created an instance of EngineInstance class");
transaction = (getEngineInstance().getDataSource()).getTransaction();
transaction.open();
fileExtension = MimeUtils.getFileExtension( mimeType );
writeBackResponseInline = RESPONSE_TYPE_INLINE.equalsIgnoreCase(responseType);
isFormEngineInstance = getEngineInstance().getTemplate().getProperty("formJSONTemplate") != null;