From http://www.liferay.com/community/wiki/-/wiki/Main/Developing+with+Expando liferay crear y settear expandos

liferay - expando

void setExpandoAttributesAndValues(
			Set<ExpandoItem> incomingExpandoSet, long companyId,
			long classPKId, Class klass, ExpandoBridge expandoBridge, boolean indexable)
			throws PortalException, SystemException {
		ExpandoTable tbl = null;
		CompanyThreadLocal.setCompanyId(companyId);
		try {
			tbl = ExpandoTableLocalServiceUtil.getDefaultTable(klass.getName());
		} catch (NoSuchTableException e) {
			tbl = ExpandoTableLocalServiceUtil.addDefaultTable(klass.getName());
		} finally {
			if (tbl == null) {
				throw new SystemException("Could not get/create expando table");
			}
		}

		for (ExpandoItem item : incomingExpandoSet) {
			String itemName = item.getName();
			int itemType = item.getType();

			ExpandoColumn col = ExpandoColumnLocalServiceUtil.getColumn(tbl
					.getTableId(), itemName);

			if (null == col) {
				col = ExpandoColumnLocalServiceUtil.addColumn(tbl.getTableId(),
						itemName, itemType);

			}
			UnicodeProperties properties = expandoBridge
					.getAttributeProperties(col.getName());
			properties.setProperty(ExpandoBridgeIndexer.INDEXABLE, Boolean.valueOf(indexable)
					.toString());
			col.setTypeSettingsProperties(properties);

			ExpandoValue val = null;
			if (item.isArray()) {
				Serializable[] itemValue = (Serializable[]) item
						.getArrayValue();
				val = ExpandoValueLocalServiceUtil.addValue(klass.getName(),
						tbl.getName(), col.getName(), classPKId, itemValue);

			} else {
				Serializable itemValue = (Serializable) item.getValue();
				val = ExpandoValueLocalServiceUtil.addValue(klass.getName(),
						tbl.getName(), col.getName(), classPKId, itemValue);
			}
			if (val == null) {
				throw new SystemException(
						"Could not add expando value: class: "
								+ klass.getName() + ", table: " + tbl.getName()
								+ ", column: " + col.getName() + " classPKId: "
								+ classPKId);
			}
			
			
		}
		
		reIndex(indexable, klass.getName(), classPKId);
	}

	/**
	 * Reindex the journal article
	 * @param isIndexEnabled (for the journal article)
	 * @param className
	 * @param classPK
	 */
	void reIndex(boolean isIndexEnabled, String className, long classPK) {
		if (!isIndexEnabled) {
			return;
		}
		Indexer indexer = IndexerRegistryUtil.getIndexer(className);
		if (indexer != null) {
			try {
				indexer.reIndex(className, classPK);
			} catch (Exception e) {
				logger.error("reindex journal article error", e);
			}
		}
	}