I haven't gotten an answer, but after rethinking the problem i think it may be because of files / folders permissions, ok this is what it is happening.
Environment: eclipse STS 3.8.2 which run over java 1.8 and the SO is macOs Sierra.
when i open the IDE for first time it creates a folder in my home user called .eclipse and inside a folder with the name org.springsource.sts_3.8.2.RELEASE_562342862_macosx_cocoa_x86_64. The IDE uses this folder to save configuration, plug-ins and so on, ok latter when i close the IDE and open it again, the IDE creates a new folder like the first but it changes the name like this org.springsource.sts_3.8.2.RELEASE_562342586_macosx_cocoa_x86_64 and saves the configuration there, so all the previous configuration it is lost.
This leads to have a fresh environment every time i open the IDE, so every plug-in installed it is lost. I have tried to copy and paste the content of one folder to another but the IDE ignores the files in there.