Yes, I know 6.x is old. But if you want to migrate and transfer the existing tool from odl to new hardware. You normaly need to install 6.x first again, as I read. The problem is the first start up after the installation of 6.x. Jira does not come up, there are problems name "unable to install class for jsp....". Did some help advices, but without any success and finally found https://bugs.openjdk.java.net/browse/JDK-8155588
New Environment : Redhat 7.4 / mysql 5.6.37 / Java 8.0.141
Any other (better) procedure to migrate and update Jira 6.01 to 7.x ?