Unable to start flowable 6.3.0 wars: liquibase-core-3.5.3.jar snakeyaml-1.13.jar

Hi. Trying to start flowable 6.3.0 from downloaded war files. Getting this error (using jetty):

The Class-Path manifest attribute in /tmp/jetty- referenced one or more files that do not exist: file:/tmp/jetty-
java.lang.IllegalArgumentException: Unable to find the main class to restart
at org.springframework.util.Assert.notNull(Assert.java:193)
at org.springframework.boot.devtools.restart.Restarter.doStart(Restarter.java:275)
at org.springframework.boot.devtools.restart.Restarter.start(Restarter.java:263)
at org.springframework.boot.devtools.restart.Restarter.lambda$immediateRestart$0(Restarter.java:171)
at org.springframework.boot.devtools.restart.Restarter$LeakSafeThread.run(Restarter.java:616)


It may be an issue with Jetty caused by the fact that these are executable wars. (meaning you can start them with java -jar *.war without deploying them on Jetty).
I’ll look into it.