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problem : after creating Maven project in idea and setting parent project, project ‘org. Springframework boot:spring-boot-starter-parent : x.x.x.release ‘not found
cause of problem : missing POM file in local warehouse
solution : Enter https://maven.aliyun.com/mvn/search , search for the missing POM file, and pay attention to select the missing version number, as shown in the figure (what I’m missing is org. Springframework boot:spring-boot-starter-parent :2.0.7.RELEASEļ¼ 
Download it to the local computer and put it in the corresponding directory 
In idea, right-click Maven — > Reimport to re import, to solve the problem