Hi. I’ve updated ECJ to new version and I’m now trying to obtain the evolution of diversity for a problem using SPEA2. I’ve watched each individual, but individuals became the same one after 3 or 4 generations. I test than population is restarted (the value for duplicate-retries is 400), but the result is that all individuals remain the same one. The size of population is 1000 and the size of archive is 100, therefore I don’t understand why population converges. I use only random mutations and initial population is random too. My two problems are that individuals became to the same individual and that the population isn’t restarted. Where is the mistake(s)? Thanks.