初学mybatis,web项目提示错误“文档结构必须从头至尾包含在同一个实体内。” ?报错

我是用mybatis替换jdbc做的Java  web项目，现在的报错如下所示。并且诡异的是：我用单元测试测试自己的代码没问题  但是用tomcat启动项目，查询数据库就报如下的错误。

org.apache.ibatis.exceptions.PersistenceException: 
### Error building SqlSession.
### Cause: org.apache.ibatis.builder.BuilderException: Error creating document instance.  Cause: org.xml.sax.SAXParseException; lineNumber: 27; columnNumber: 17; XML 文档结构必须从头至尾包含在同一个实体内。
	at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:26)
	at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:54)
	at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:38)
	at com.syl.demo.util.MybatisUtil.<clinit>(MybatisUtil.java:17)
	at com.syl.demo.service.DeptService.getDeptInfo(DeptService.java:21)
	at com.syl.demo.action.UserAction.doGet(UserAction.java:67)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:94)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1132)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
	at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2521)
	at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2510)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.ibatis.builder.BuilderException: Error creating document instance.  Cause: org.xml.sax.SAXParseException; lineNumber: 27; columnNumber: 17; XML 文档结构必须从头至尾包含在同一个实体内。
	at org.apache.ibatis.parsing.XPathParser.createDocument(XPathParser.java:256)
	at org.apache.ibatis.parsing.XPathParser.<init>(XPathParser.java:120)
	at org.apache.ibatis.builder.xml.XMLConfigBuilder.<init>(XMLConfigBuilder.java:63)
	at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:51)
	... 27 more
Caused by: org.xml.sax.SAXParseException; lineNumber: 27; columnNumber: 17; XML 文档结构必须从头至尾包含在同一个实体内。
	at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:198)
	at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:177)
	at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:441)
	at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:368)
	at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1436)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.endEntity(XMLDocumentFragmentScannerImpl.java:903)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.endEntity(XMLDocumentScannerImpl.java:563)
	at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.endEntity(XMLEntityManager.java:1384)
	at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.load(XMLEntityScanner.java:1774)
	at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.scanData(XMLEntityScanner.java:1252)
	at com.sun.org.apache.xerces.internal.impl.XMLScanner.scanComment(XMLScanner.java:778)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanComment(XMLDocumentFragmentScannerImpl.java:1038)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2988)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:606)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)
	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
	at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:243)
	at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:347)
	at org.apache.ibatis.parsing.XPathParser.createDocument(XPathParser.java:254)
	... 30 more

这是报错。

以下是我的配置

mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!--定义别名-->
    <typeAliases>
        <typeAlias alias="dept" type="com.syl.demo.pojo.Dept"></typeAlias>
    </typeAliases>
    <!-- 对事务的管理和连接池的配置 -->
    <environments default="development">
        <environment id="development">
            <!--采用JDBC数据库事务管理-->
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver" />
                <property name="url" value="jdbc:mysql://localhost:3306/demo_02?useSSL=true" />
                <property name="username" value="syl_demo_02" />
                <property name="password" value="song" />
            </dataSource>
        </environment>
    </environments>

    <mappers>
        <mapper resource="com/syl/demo/dao/mapper/deptMapper.xml" />

    </mappers>
</configuration>

deptMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">


<mapper namespace="com.syl.demo.dao.DeptDao">
    <sql id="Base_Column_List" >
        dept_id as deptId,dept_name as  deptName,dept_up as deptUp
    </sql>

    <select id="getAllDeptInfo" resultType="dept" >
        select
        <include refid="Base_Column_List" />
        from dept
    </select>

    <select id="getDeptInfo" resultType="dept" >
        select
        <include refid="Base_Column_List" />
        from dept
        where dept_id=#{deptId}
    </select>
    <insert id="createDept" parameterType="dept" keyColumn="dept_id" >

      INSERT  INTO dept (dept_id,dept_name,dept_up) VALUES (#{deptId},#{deptName},#{deptUp})
    </insert>

</mapper>

mybatis工具类：MybatisUtil .java

package com.syl.demo.util;
import java.io.Reader;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;


public class MybatisUtil {
    public static SqlSessionFactory sqlSessionFactory;
    private static Reader reader;
    //public static SqlSession session ;
    static {
        try {
            reader = Resources.getResourceAsReader("mybatis-config.xml");
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public MybatisUtil () {

    }

    public static SqlSession getSession () {

        return sqlSessionFactory.openSession();
    }


}

mybatis 工具类的测试正常

 MybatisUtilTest .java

package com.syl.demo.util;

import com.syl.demo.dao.DeptDao;
import com.syl.demo.dao.NoticeDao;
import com.syl.demo.pojo.Dept;
import com.syl.demo.pojo.Notice;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;

import java.util.List;


public class MybatisUtilTest {

    @Test
    public void  testMybatis(){

        SqlSession session = null;
        try {

            session =MybatisUtil.getSession();
            DeptDao deptDao =  session.getMapper(DeptDao.class);
            List<Dept> dept =deptDao.getAllDeptInfo();
            System.out.println(dept.toString());
           /* Dept d = new Dept();
            d.setDeptId("20170909001");
            d.setDeptName("第一支部一分部");
            d.setDeptUp("20170909");
            deptDao.createDept(d);
            session.commit();*/


            List<Notice> notice ;
            session = MybatisUtil.getSession();
            NoticeDao noticeDao =  session.getMapper(NoticeDao.class);
            notice =noticeDao.getNoticeObject();
            System.out.println(notice.toString());

        } finally {
            session.close();
        }
    }

}

但是在Tomcat启动后，运行业务类就不正常，报上面的错误：

DeptService .java   这个类就普通的servlet调用

package com.syl.demo.service;

import com.syl.demo.dao.DeptDao;
import com.syl.demo.pojo.Dept;
import com.syl.demo.util.MybatisUtil;
import org.apache.ibatis.session.SqlSession;


public class DeptService extends CommonService {
    @Override
    public String ObjectToJson(Object object){
        return super.ObjectToJson(object);
    }

    public Dept getDeptInfo (String dept_id) {

        SqlSession session = null;
        Dept dept;
        try {

            session = MybatisUtil.getSession();
            DeptDao deptDao = session.getMapper(DeptDao.class);
            dept = deptDao.getDeptInfo(dept_id);
            System.out.println(dept.toString());

        } finally {
            session.close();
        }
        return dept;
    }
}