Upgrading the maven plugin from 1.7 to 1.8 results in the following error message:
[ERROR] 'dependencies.dependency.systemPath' for com.sun:tools:jar must specify an absolute path but is ${toolsjarSystemPath} @ pom.xml /ash-domain line 1
I had the same problem and I've just added in eclipse.ini the path to the JDK8.
In my case:
-vm
C:\Program Files (x86)\Java\jdk1.8.0_60\bin\javaw.exe
(must be before -vmargs)