https://github.com/Terracotta-OSS/offheap-store/: A library that offers data structures allocated off the java heap. 
public interface org.terracotta.offheapstore.HashingMap<K, V> extends java.util.Map<K, V>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.terracotta.offheapstore.HashingMap
  super_class: java.lang.Object
{
  public abstract java.util.Map<K, V> removeAllWithHash(int);
    descriptor: (I)Ljava/util/Map;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (I)Ljava/util/Map<TK;TV;>;
    MethodParameters:
         Name  Flags
      keyHash  
}
Signature: <K:Ljava/lang/Object;V:Ljava/lang/Object;>Ljava/lang/Object;Ljava/util/Map<TK;TV;>;
SourceFile: "HashingMap.java"