mapper绑定异常 springframework.web.util.NestedServletException

错误内容： mapper绑定异常 
org.springframework.web.util.NestedServletException: 
Request processing failed; nested exception is org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): cn.e3mall.mapper.TbItemMapper.selectByPrimaryKey 
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:981) 
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:860) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:621) 
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:845) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:728) 
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) 
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121) 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

解决：这个是因为maven工程下mybatis 没有找到mapper的xml文件 
由于mapper接口编译后在同一个目录下没有找到mapper映射文件而出现的。由于maven工程在默认情况下src/main/java目录下的mapper文件是不发布到target目录下的。

在pom文件中添加： 
如果不添加此节点mybatis的mapper.xml文件都会被漏掉

<build>
        <finalName>upload</finalName>

        <resources>

            <resource>
                <!-- 如果不加，那么打包的时候mapper文件不会被加载进来 -->
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
  
    </build>