With the upcoming version 7.8.0 we depend on a Java 7 compatible JVM configured as the default system JVM. This has to be set up before starting the update process or the update will fail with


Your current system JVM doesn't meet our minimum requirements.
Please select a Java 7 compatible system JVM as your default.

Furthermore the startup of the server will fail and log the same error to open-xchange-console.log if an incompatible JVM is detected during startup.