solve:

1. find the workspace.xml configuration file in the. Idea folder of the project

1. it may be hidden. You can set editor – > through idea; Remove. Idea from the ignore… Box at the bottom of file types. Locate the component name = “propertiescomponent” tag. Add a line at the bottom of the tag: property name = “dynamic. Classpath” value = “true”. Final effect

<component name="PropertiesComponent">
...other properties... 
 <property name="dynamic.classpath" value="true" />
</component>