FULL PRODUCT VERSION :
java version "1.8.0_144"
Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)


FULL OS VERSION :
Linux acme 3.13.0-44-generic #73-Ubuntu SMP Tue Dec 16 00:22:43 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux


EXTRA RELEVANT SYSTEM CONFIGURATION :
No env vars to specify java options

A DESCRIPTION OF THE PROBLEM :
Only specifying -XX:+AggressiveHeap prevents the JRE from starting.

I am aware of the release note "JDK-8173678 : Release Note: With UseG1GC, specifying -XX:ParallelGCThreads=0 is no longer allowed".

But I think it does not apply since I am not trying to use G1GC.



THE PROBLEM WAS REPRODUCIBLE WITH -Xint FLAG: Yes

THE PROBLEM WAS REPRODUCIBLE WITH -server FLAG: Yes

REGRESSION.  Last worked in version 8u121

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Execute 
java -XX:+AggressiveHeap <anyclass>

You will see errors message
The Parallel GC can not be combined with -XX:ParallelGCThreads=0

EXPECTED VERSUS ACTUAL BEHAVIOR :
The JDK to start
REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class a
{
    public static void main( String[] args )
    {
        System.out.println( "hello" );
    }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
I was able to get my JRE to start by specifying -XX:ParallelGCThreads=1 before -XX:+AggressiveHeap. 
But I don't think this is ideal since from what I can tell the JRE used to decide how many threads to use based on the number of threads and memory in the system.