Other Software modeling / UML tooling

I can suggest devel/umbrello, a UML modeler for KDE. Also, OpenOffice / LibreOffice do offer diagramming capabilities.
After trying other suggestions this umbrello worked out of the box. Argouml, Plantuml and Netbeans... I can get only a blank and white screen as base window.
It seems the software works but don't show anything. Some sort of dialog boxes up and show but only a blank canvas was available. I suppose I missed some configurations. I didn't compiled but used plain pkg available for openjdk (tested some versions) but the result remained the same.
I've installed dbus-java... No way, not worked. (and mounted procfs)
Finally, I've tried umbrello - binary package - and works like a charm.
My window manager: dwm.
So, I will not try some bogus and bloated wm just for sketch some lousy diagrams for training.
If inevitable, better go to a linux box or install virtualbox. No I don't deserve fight back again those beasts again.
 
My window manager: dwm.
So, I will not try some bogus and bloated wm just for sketch some lousy diagrams for training.
I think you might be running into the classic reparenting issue with Dwm and Java detailed here (along with a solution)?

https://man.cx/dwm#heading8

Java applications which use the XToolkit/XAWT backend may drawgrey windows only. The XToolkit/XAWT backend breaksICCCM-compliance in recent JDK 1.5 and early JDK 1.6versions, because it assumes a reparenting window manager.Possible workarounds are using JDK 1.4 (which doesn’tcontain the XToolkit/XAWT backend) or setting theenvironment variable AWT_TOOLKIT=MToolkit (to use theolder Motif backend instead) or running xprop -root -f_NET_WM_NAME 32a -set _NET_WM_NAME LG3D or wmnameLG3D (to pretend that a non-reparenting window manageris running that the XToolkit/XAWT backend can recognize) orwhen using OpenJDK setting the environment variable_JAVA_AWT_WM_NONREPARENTING=1.

That said, for UML, I highly recommend Dia for simple class diagrams or... DOSBox + Win3.1 + Visio. Sounds mad but it uses less ram than even Dia and has so much functionality compared to even modern Visio.
 
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