As you can see in the image above, instead of the J in my workspace appear that brown thing, i realize is something related to Project Facets and its just IDE related as some research says, someone even says to delete all <natures>
tags from .project file in project but it doenst work. So i would like to know how to restore it. Thanks in advance!
In the end i found the solution for restoring the original behaviour, i just deleted <natures>
tags in the .project files, keeping the following:
<natures>
<nature>org.eclipse.jdt.core.javanature</nature>
<nature>org.eclipse.m2e.core.maven2Nature</nature>
</natures>