if you are using Java 8 please use Wildfly installation and not JBoss AS. In order to use JBoss AS you have to use Java 7 or Java 6.

Installation Procedure

Download the pre-packaged distribution for JBoss AS 7 from http://camunda.org/release/camunda-bpm/jboss/, for Wildfly 8 from http://camunda.org/release/camunda-bpm/wildfly8/, for Wildfly 10 from http://camunda.org/release/camunda-bpm/wildfly10/, or for Wildfly 11 from https://camunda.org/release/camunda-bpm/wildfly11/.
Unpack the distro to a directory.
Adjust the datasource according to your needs (see Manual Installation).
Startup the server by running camunda-welcome.bat or by using the $JBOSS_HOME/bin/standalone.{bat/sh} script.
Accessing the H2 console

In JBoss/Wildfly you can easily access the H2 console to inspect your local H2 database (used in demo/evaluation scenarios):

Go to http://localhost:8080/h2/h2
Login with the following data:
- jdbc./camunda-h2-dbs/process-engine
- User: sa
- Password: sa

原文: https://docs.camunda.org/manual/7.9/installation/full/jboss/pre-packaged/

Pre-Packaged Distribution