mysql tinyint在java中返回位，列大小返回null。对于其他数据类型，它工作正常。有什么解决办法吗？

Class clsObj = Class.forName(className);
AbstractEntityPersister classMetadata = (AbstractEntityPersister) getSessionFactory().getClassMetadata(clsObj);
String[] properties = classMetadata.getPropertyNames();
String tableName = classMetadata.getTableName();

Map<String, String> dbFieldToPojoFieldMap = new HashMap<String, String>();
for (String prop : properties) {
    String[] names = classMetadata.getPropertyColumnNames(prop);
    dbFieldToPojoFieldMap.put(names[0], prop);
}

DatabaseMetaData meta = con.getMetaData();
ResultSet rsColumns = meta.getColumns(null, null, tableName, null);

while (rsColumns.next()) {
    Map<String, String> columnMetaData = new HashMap<String, String>();
    String columnName = rsColumns.getString(Constants.COLUMN_NAME);
    String columnType = rsColumns.getString(Constants.TYPE_NAME);
    String columnSize = rsColumns.getString(Constants.COLUMN_SIZE);
    String decimalDigits = rsColumns.getString(Constants.DECIMAL_DIGITS);
}