spring装载配置文件失败报错org.springframework.beans.factory.xml.XmlBeanDefinitionStoreException

Tomcat容器启动失败，显示:

org.springframework.beans.factory.xml.XmlBeanDefinitionStoreException: Line 1 in XML document from class path resource [spring/applicationContext.xml] is invalid; nested exception is org.xml.sax.SAXParseException: The processing instruction target matching “[xX][mM][lL]” is not allowed.

回头打开**.xml仔细看了下

竟然在文件开头多了一个空格，导致识别不了文件。不得不承认，有时候问题就是这么纠结而细微:在