eclipse引入的使用XStream来完成java对象转换成xml操作

现在不知道报错要怎么才能解决？
报错Exception in thread "main" java.lang.ExceptionInInitializerError
报错Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make field private final java.util.Comparator java.util.TreeMap.comparator accessible: module java.base does not "opens java.util" to unnamed module @635eaaf1