报错信息：

Type Exception Report

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

org.apache.ibatis.exceptions.PersistenceException:

### Error querying database.  Cause: java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for com.bjsxt.mapper.PeopleMapper

### Cause: java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for com.bjsxt.mapper.PeopleMapper

	org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:26)

	org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:111)

	org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:102)

	org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:98)

	com.bjsxt.service.impl.PeopleServiceImpl.show(PeopleServiceImpl.java:21)

	com.bjsxt.servlet.ShowServlet.service(ShowServlet.java:26)

	javax.servlet.http.HttpServlet.service(HttpServlet.java:731)

	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

	org.apache.logging.log4j.core.web.Log4jServletFilter.doFilter(Log4jServletFilter.java:66)

Root Cause

java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for com.bjsxt.mapper.PeopleMapper

	org.apache.ibatis.session.Configuration$StrictMap.get(Configuration.java:797)

	org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:631)

	org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:624)

	org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:107)

	org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:102)

	org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:98)

	com.bjsxt.service.impl.PeopleServiceImpl.show(PeopleServiceImpl.java:21)

	com.bjsxt.servlet.ShowServlet.service(ShowServlet.java:26)

	javax.servlet.http.HttpServlet.service(HttpServlet.java:731)

	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

	org.apache.logging.log4j.core.web.Log4jServletFilter.doFilter(Log4jServletFilter.java:66)

错误的原因 ： 在service层调用mapper的时候 只写了命名空间namespace  没有指定下面的方法selAll

												


											
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