根据报错,返回应该是MetadataBean对象,你把Map<String, Object>改为MetadataBean试试
List
List
Map
for (MetadataBean bean : metadataList) {
String metadata_id = String.valueOf(bean.get("metadata_id"));
String metadata_name = String.valueOf(bean.get("metadata_name")).trim();
String parent_id = String.valueOf(bean.get("parent_id"));
String isLeaf = String.valueOf(bean.get("isleaf"));
String grade = String.valueOf(bean.get("grade"));
String metadata_type = String.valueOf(bean.get("metadata_type"));
//JOptionPane.showMessageDialog(null, isLeaf);treeMap =newHashMap