Your build log will state which version of .target file is being fetched
from Nexus. That version will map 1:1 to a folder on download.jboss.org.
For example:
> Downloading:
https://repository.jboss.org/nexus/content/groups/developer/org/jboss/tools/targetplatforms/jbosstools-unified/4.30.2.Alpha1-SNAPSHOT/maven-metadata.xml
Maps to this target platform:
http://download.jboss.org/jbosstools/targetplatforms/jbosstoolstarget/4.30.2.Alpha1-SNAPSHOT/
Should you need to build against a different target platform than the
versions stated in the parent pom, you can override with this:
> mvn verify -DTARGET_PLATFORM_VERSION=4.21.4.Final-SNAPSHOT
By the way, we do maintain a "maximum" and "minimum" profiles for
you which define the version of target-platfrom we support. Instead
of using the -DTARGET_PLATFORM_VERSION and choosing a version of the
TP, you should use "-Pmaximum" or "-Pminimum" which will set you the
right version of supported Target Platfroms for this build.