If you're doing GP, out of memory errors will be common: GP individuals bloat unless you use one of many techniques to keep them under control. In this case, you need to increase the heap size. Here we increase it to 500M: java -Xmx500M ec.Evolve ... If you're doing something *other* than GP, sure, it could be a leak of some sort; though ECJ hasn't historically had many leaks -- hash table overfills etc ... On Jun 13, 2006, at 6:28 AM, Alberto Cuesta wrote: > Hello all, > > I'm running Genetic Programming experiments, and I get easily this > error: > > Exception in thread "EvolutionAgent.2508451.8329630" > java.lang.OutOfMemoryError: Java heap space > > I think that it's that the population genotypes grow and exceed > over a certain memory limit assigned to the JVM, but I could be > wrong and have a memory leak somewhere. Has anyone some directions > to investigate or solve this? > > Thanks, > Alberto