An error occurs in the file header during spring configuration, but no error is prompted.

Sometimes an error may occur after spring is configured according to the tutorial, but the running is normal. Most of the differences are the xml configuration of spring configuration and the actual package, as shown below:

However, the version in the configuration package is different from that in the configuration package.

This problem is generally caused by XML reference to spring's XSD version.

The problem of replacing all 3.0 with 2.0 is solved.

This problem also exists in struts2. You can also change the configuration information to the same one in your package.