下载时出错'http://java.sun.com/xml/ns/persistence/persistence_2_1.xsd'到C://<path>

Question

我有以下的坚持。xml文件

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" 
     xmlns="http://java.sun.com/xml/ns/persistence" 
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
     xsi:schemaLocation="http://java.sun.com/xml/ns/persistence 
     http://java.sun.com/xml/ns/persistence/persistence_2_1.xsd">
 <persistence-unit name="<>">
      <class>com.myApplication.MyFristApp</class>
      <class>com.myApplication.MyFristApp</class>
 </persistence-unit>

我所拥有的是 爪哇11， 日食4.16光子， 雄猫9

当我尝试从Java8迁移到Java11时，我在标签上得到了以下错误

Error while downloading 'http://java.sun.com/xml/ns/persistence/persistence_2_1_.xsd' to C:\users\kishore\.lemminx/cache\http\java.sun.com\....

我这几天都在找这个。无法解决