OpenWFE is a java open source workflow/BPM engine. It's available under a BSD license.
'org.openwfe:openwfe:1.7.0'
<dependency>
<groupId>org.openwfe</groupId>
<artifactId>openwfe</artifactId>
<version>1.7.0</version>
</dependency>
<dependency org="org.openwfe" name="openwfe" rev="1.7.0"/>
"org.openwfe", "openwfe", "1.7.0"