Synology Version is less than 1.8. Please download and install Java 1.8 or higher

Hello i’m trying to install OpenHAB on my Synology DS218+ DSM6
i followed the tutorial and installed Java 8 from the “Package Center”
clicked Java8 and upgrade it to newly version by installing “Linux ARM 64 Hard Float ABI - jdk-8u171-linux-arm64-vfp-hflt.tar.gz” as adviced

now when installing the openHAB snapshot or the pre version they all show me the same error
going to the log i get this message

2018-05-03:15:33:46

Set instance variables…
public: false
smarthome: false
home: true
port: 8080
tmp: /volume1/@tmp
share: /var/services/homes
oh: /var/services/homes/openhab
backup: -backup-201805
done
Start preinst…
Found java executable in PATH
Java version
ERROR:
Version is less than 1.8. Please download and install Java 1.8 or higher.
On DSM 4 or 5 you have to rename the file to java 7 like:
jdk-8u144-linux-i586.tar.gz to jdk-7u81-linux-i586.tar.gz (81 as example for version 8.1)

please check attachment
thanks.