java.util.ConcurrentModificationException: null遍历删除

java.util.ConcurrentModificationException: null循环删除报错

//实配船员有  船员证书列表就不显示了
        for (Map<String, Object> stringObjectMap : zwcyAndSpZwcyMapList) {
            List<Map<String, Object>> typSpMapList = (List<Map<String, Object>>) stringObjectMap.get("typSpMapList");
            if (BeanUtil.isNotEmpty(typSpMapList)) {
                for (Map<String, Object> objectMap : typSpMapList) {
                    for (JcCyzs jcCyzs : jcCyzsList) {
                        if (objectMap.get("xm").equals(jcCyzs.getXm())){
                            jcCyzsList.remove(jcCyzs);
                        }
                    }
                }
            }
        }

改写成索引遍历就可以了

//实配船员有  船员证书列表就不显示了
        for (Map<String, Object> stringObjectMap : zwcyAndSpZwcyMapList) {
            List<Map<String, Object>> typSpMapList = (List<Map<String, Object>>) stringObjectMap.get("typSpMapList");
            if (BeanUtil.isNotEmpty(typSpMapList)) {
                for (Map<String, Object> objectMap : typSpMapList) {
                    for (int i = 0; i < jcCyzsList.size(); i++) {
                        if (objectMap.get("xm").equals(jcCyzsList.get(i).getXm())){
                            jcCyzsList.remove(i);
                        }
                    }
                }
            }
        }