Hi Lawrence,
Activiti-explorer is a web app module that comes with Activiti to demonstrate how processes can be modeled, started and completed. You can say it is an example to show people how activiti-engine and activiti-rest can be used in real life applications. I would strongly recommend you to understand Activiti at its core first i.e. the activiti-engine and activiti-rest before trying to embed activiti-explorer to your web app.
Furthermore, you said
I would like to integrate the activiti-explorer interface, without adding the WAR activiti-explorer in my webapps
It sounds like you want to re-use the UI part of the activiti-explorer. You can always have a look at the source of the explorer and understand how the UIs were built. You can find the source code here Activiti/modules/activiti-explorer at master · Activiti/Activiti · GitHub.
What I would do is get the source from Git, build it and Java debug it to understand every aspect about it. Once you fully understand how it was built, you can then apply whatever you want from it to your own application. There's no shortcut really.
Hope it helps,
Thanks,
Thong Huynh
