mx version check question with openjdk build JDK

[Eric Caspole]

After meging up, "mx clean" does not work with my Sumatra JDK. It works 
OK if JAVA_HOME is JAVA_HOME=/opt/jdk1.8.0_05

In my mx/env it is:
JAVA_HOME=/home/ecaspole/views/sumatra-dev/build/linux-x86_64-normal-server-fastdebug/images/j2sdk-image/


$ ./mx.sh clean
Traceback (most recent call last):
   File "/home/ecaspole/views/graal-default/graal/mxtool/mx.py", line 
4921, in <module>
     main()
   File "/home/ecaspole/views/graal-default/graal/mxtool/mx.py", line 
4858, in main
     defaultJdk = JavaConfig(opts.java_home, opts.java_dbg_port)
   File "/home/ecaspole/views/graal-default/graal/mxtool/mx.py", line 
1750, in __init__
     self.version = VersionSpec(version.split()[2].strip('"'))
AttributeError: 'NoneType' object has no attribute 'split'


So -version is different in my build compared to a release:

$ 
/home/ecaspole/views/sumatra-dev/build/linux-x86_64-normal-server-fastdebug/images/j2sdk-image/bin/java 
-version
openjdk version "1.8.0-internal-fastdebug"
OpenJDK Runtime Environment (build 
1.8.0-internal-fastdebug-ecaspole_2014_06_04_10_32-b00)
OpenJDK 64-Bit Server VM (build 25.0-b70-fastdebug, mixed mode)

$ /opt/jdk1.8.0_05/bin/java -version
java version "1.8.0_05"
Java(TM) SE Runtime Environment (build 1.8.0_05-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.5-b02, mixed mode)


I am not sure that is the exact problem here. Is it "java version" vs 
"openjdk version" ?
Thanks,
Eric