Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'adminServiceImpl': Unsatisfied dependency expressed through field 'adminMapper'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'adminDao' defined in file [E:\IdeaProjects\survey\target\classes\com\zp\mapper\AdminDao.class]: Cannot resolve reference to bean 'sqlSessionFactory' while setting bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is org.apache.ibatis.builder.BuilderException: Error creating document instance.  Cause: org.xml.sax.SAXParseException; lineNumber: 2; columnNumber: 6; 不允许有匹配 "[xX][mM][lL]" 的处理指令目标。

在使用ssm的时候，遇到如上问题，查了好一会最终才发现xml文件上方有空格，只要将xml文件上方的空格删掉就ok了。<?xml version="1.0" encoding="UTF-8"?>在这行前方没有空格。