Readonly Set and Map that use a MappedByteBuffer to load quickly and use minimal Java Heap.
'com.github.scr:memory-mapped-hashmap:1.1.0'
<dependency>
<groupId>com.github.scr</groupId>
<artifactId>memory-mapped-hashmap</artifactId>
<version>1.1.0</version>
</dependency>
<dependency org="com.github.scr" name="memory-mapped-hashmap" rev="1.1.0"/>
"com.github.scr", "memory-mapped-hashmap", "1.1.0"