*lein will pass the value of JVM_OPTS to the Java process it spawns; however, this env var does not affect lein itself (for that, use LEIN_JVM_OPTS) and will also not affect any separate Java processes launched directly (for that, use _JAVA_OPTIONS or JAVA_TOOL_OPTIONS) _JAVA_OPTIONS This is the most powerful Java environment variable. It’s read directly by the JVM and overwrites any other Java en