I also tried to build DCAE demo on Ubuntu 14.04 with Apache Maven 3.3.9. However, it returned the following.

[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] dcae-demo-controller ............................... FAILURE [02:29 min]
[INFO] dcae-demo .......................................... SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 02:33 min
[INFO] Finished at: 2017-05-14T19:56:26-07:00
[INFO] Final Memory: 18M/60M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project dcae-demo-controller: Could not resolve dependencies for project org.openecomp.dcae.demo:dcae-demo-controller:pom:1.1.0-SNAPSHOT: The following artifacts could not be resolved: org.eclipse.core:org.eclipse.core.runtime:jar:3.10.0.v20140318-2214, org.eclipse.core:org.eclipse.core.contenttype:jar:3.4.200.v20140207-1251: Could not find artifact org.eclipse.core:org.eclipse.core.runtime:jar:3.10.0.v20140318-2214 in opendaylight-mirror (https://nexus.opendaylight.org/content/repositories/public/) -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException