metaspace, ami unlimited by default
leanykori neven PermGen
https://dzone.com/articles/java-memory-architecture-model-garbage-colle…
https://dzone.com/articles/java-8-permgen-metaspace
https://stackoverflow.com/questions/18339707/permgen-elimination-in-jdk…
Valtig allitom a hibernate es session classok csucsulnek ott mert nem engedi el a jpa a jdbc connection dolgok miatt :-)