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