See https://blogs.oracle.com/jonthecollector/entry/presenting_the_permanent_generation https://blogs.oracle.com/jonthecollector/entry/presenting_th.... How the

See https://blogs.oracle.com/jonthecollector/entry/presenting_the_permanent_generation https://blogs.oracle.com/jonthecollector/entry/presenting_th.... How the JVM handled class metadata changed in Java 8; the MaxPermGen argument is ignored on that version (http://java.dzone.com/articles/java-8-permgen-metaspace http://java.dzone.com/articles/java-8-permgen-metaspace). P.S. According to that second link, interned strings haven't been stored in the permanent generation since Java 7.