can't resolve another child project when running mvn tomcat:run

I开发者_开发百科'm developing a maven project with following structure:

main // project which packaging is pom  
|-- datalevel-project
|-- service-project 
`-- web-ui-project

I'm trying to run project on tomcat but when I command mvn tomcat:run on the folder of main project I get an error while it is building the service-project:

Failed to resolve artifact.
Missing:
1) datalevel-project:jar:0.0.1-SNAPSHOT

and so on..

I have set all child projects to main project with module tag and all child projects have parent and its relativePath to ../main project.

Can somebody tell me where is the problem??

Firstly, dependencies are resolved through your local repository. Did you install (in maven sense) the datalevel-project (and other artifacts) to your repository? I suggest to run mvn install on your main project to build and install everything first.

Secondly, why do you run mvn tomcat:run on the aggregator pom (the main project)? I'd expect this goal to be called on a project with a packaging of type war (the web-ui-project).

Thirdly, I have a doubt about the way you declared the relativePath. Given your project structure, it should be ../pom.xml which is actually the default value so you could omit it (providing relevant pom snippets would help).