Exclamation mark in maven

The reason for the exclamation mark in
maven Cause:
Because some jars managed by maven were not downloaded correctly.

Check the buildpath first, find the problematic jar package, and then solve them one by one.

For these problematic jars, because the current maven repository cannot be found, you can add a maven repository that can find the corresponding jar by the following methods:

1. In google Directly search for the corresponding jar, for example: jmxri-1.2.1.jar

2. Find the maven repository with this jar in the search results and add it to setting.xml.

3. Right-click the project again - maven - update dependencies.