What should I do if there is an error when tomcat loads the war package?

Try to use springmvc, mybatis, mysql as a tool platform.

It runs normally on the local mac laptop, but when I place the package on the server and start tomcat, an error is reported. Class not found.

File Directory:

Implementation requirements: Upload documents and record them in the database. Created the DocFile class by itself. Create the corresponding mapper file and write the sql statement.

The namespace in mapper.xml points to DocFileDao.

select * from t_docfile where docFileType=#{docFileType}  and valiable='Y'update t_docfile set valiable='N' where docFileId=#{docFileId}select * from t_docfile where  docFileId=#{docFileId}

But after starting, it inexplicably reported that the DocFile class could not be found. And there is an exclamation mark after the war package in the prompted path.

Later I found out that I was careless in the class reference of the mapper file. I did not add

select * from t_docfile where  docFileId=#{docFileId}

to the complete package path and changed it to

select * from t_docfile where  docFileId=#{docFileId}

It will be normal if you package and upload it and restart it. The reason why the local environment does not report an error is that some configurations within the environment are messed up and do not appear.

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