Solve the scheme and dtds of the xml configuration file in the Maven project to display Url is not register

When we build a Maven project, sometimes we encounter the problem that our configuration file scheme and dtds show that Url is not register. The first solution: At this time, we only need to click the indication in front to search for

external
resources.

The second method
: if the first automatic adding method fails, we try to add it manually, that is, we copy the Url that reported the warning and manually add it to scheme and dtds. After that, the problem will be solved


.