错误一:org.springframework.jdbc.BadSqlGrammarException: PreparedStatementCallback; bad SQL grammar [select DISTINCT principal as TYPECODE , realname as TYPENAME from user_msg order by principal]; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'jeecg.user_msg' doesn't exist错误二:[ERROR] [org.jeecgframework.poi.excel.export.ExcelExportServer:172] java.lang.NullPointerException
错误三:Servlet.service() for servlet [springMvc] in context with path [/jeecg] threw exception [Request processing failed; nested exception is org.jeecgframework.poi.exception.excel.ExcelExportException: Excel导出错误] with root causeorg.jeecgframework.poi.exception.excel.ExcelExportException: Excel导出错误