warning when run mvn test -B

[lidaobing]

$ mvn test -B

[WARNING]
[WARNING] Some problems were encountered while building the effective model for com.jdcloud.sdk:pod:jar:1.0.0
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-compiler-plugin is missing. @ line 89, column 15
[WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING]
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING]