reason ：
May be jar There's something wrong with the bag .
resolvent :
1. Find the corresponding class that cannot be loaded jar package .
2. stay tomcat in webapps/INF/lib Find the corresponding jar package , Then delete .
3. Download another version of jar package .
3. If it is to use eclipse perhaps myEclipse You have to server Next tomcat Remove this item from add Deployment.
4. Restart the server .（ Problem not resolved after restart , Continue to repeat the above operation ）
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