Project Right maven-> update project.
If there is missing the jar, then the project right maven-> update project, but this time check Force Update ... that line, and then OK.
If at this time the jar still missing, according to buildpath tips jar package missing paths to the corresponding position maven local repository, delete the file xxx.lastUpdated jar package, and then re-execute projects right maven-> update project.
Reprinted: https://www.cnblogs.com/skyislimit/p/5643601.html