I found the missing class in the org.xwiki.component.manager ,and it had already built
success and installed, but the error occurred
Description Resource Path Location Type
The project was not built since its build path is incomplete. Cannot find the class file
for org.xwiki.component.descriptor.ComponentDescriptor. Fix the build path then try
building this project XWiki Commons - Legacy - Component - Default
Implementation Unknown Java Problem
Description Resource Path Location Type
The type org.xwiki.component.descriptor.ComponentDescriptor cannot be resolved. It is
indirectly referenced from required .class files LogEnabledLifecycleHandler.java /XWiki
Commons - Legacy - Component - Default
Implementation/src/main/java/org/xwiki/component/embed line 1 Java Problem