The problem occurs because Maven by default assumes that the parent pom is found in the parent folder of the one that contains the module pom. However, in your project that does not seem to be the case: Your parent pom is org.springframework.boot:spring-boot-starter-parent:1.5.6.RELEASE while the pom com.xxx:parent:1.0.0 in the parent folder is only used as an aggregator for the modules.
To solve this problem you need to unset the relative path in the parent declaration in the module poms like this:
relativePath
How to fix the WARNING message while running “mvn clean install”
How to fix the WARNING message while running “mvn clean install”
How to fix the WARNING message while running “mvn clean install”