[rules-users] rule execution problem - internationalization

hi all, we tried to write rules in chinese like follows rule "Reorder alert when item expires" salience 10 when $item : ImsItemRecords () then if ( ! (new Date()).before ($item.getExpireDate())) { SysAlert alert = new SysAlert("过期 - " + $item.getItemName(), "补充库存", "很高", "新到", new Date(), null); SysRecommendation recommendation1 = new SysRecommendation (alert, "补充库存", "购买" + $item.getAmount() + $item.getUnit() + $item.getItemName(), "仓库管理人员", "立即"); ... HashSet recommendations = new HashSet(); recommendations.add(recommendation1); ... alert.setSysRecommendations(recommendations); insert (alert); } end The rule was executed, but the result is unexpected. some of above chinese characters (for example, "新到") are good; some of above chinese characters become ??? after rule evaluation. any tips how to fix this. thanks- dejia