Spring配置文件异常：White spaces are required between publicId and systemId

1、问题：

Exception in thread "main" <span style="color:#ff0000;">org.springframework.beans.factory.xml.XmlBeanDefinitionStoreException: Line 1 in XML document from class path resource [Bean3.xml] is invalid; nested exception is org.xml.sax.SAXParseException: White spaces are required between publicId and systemId.</span>Exception in thread "main" <span sty