Guava is a set of core libraries that includes new collection types (such as multimap and multiset), immutable collections, a graph library, functional types, an in-memory cache, and APIs/utilities for concurrency, I/O, hashing, primitives, reflection, string processing, and much more. 
It is memory efficient. Its most interesting class is <A HREF="http://google-collections.googlecode.com/svn/trunk/javadoc/com/google/common/collect/MapMaker.html" target="_blank">MapMaker</A>, which is a ConcurrentMap builder, providing any combination of these features: soft or weak keys, soft or weak values, timed expiration, and on-demand computation of values. Check out their video in <A HREF="http://www.youtube.com/watch?v=ZeO%5FJ2OcHYM" target="_blank">Youtube</A>.

Guava is a set of core libraries that includes new collection types (such as multimap and multiset), immutable collections, a graph library, functional types, an in-memory cache, and APIs/utilities for concurrency, I/O, hashing, primitives, reflection, string processing, and much more.

Guava - Google Core Libraries for Java

Redisson - distributed Java objects and services (Set, Multimap, SortedSet, Map, List, Queue, BlockingQueue, Deque, BlockingDeque, Semaphore, Lock, AtomicLong, Map Reduce, Publish / Subscribe, Bloom filter, Spring Cache, Executor service, Tomcat Session Manager, Scheduler service, JCache API) on top of Redis server. Rich Redis client.
 
Its features include: 
<ul>
<li>Replicated servers mode (also supports <a href="http://docs.aws.amazon.com/AmazonElastiCache/latest/UserGuide/Replication.html">AWS ElastiCache</a> and <a href="https://azure.microsoft.com/en-us/services/cache/">Azure Redis Cache</a>):
<ol>
<li>automatic master server change discovery</li>
</ol>
</li>
<li>Cluster servers mode (also supports <a href="http://docs.aws.amazon.com/AmazonElastiCache/latest/UserGuide/Clusters.html">AWS ElastiCache Cluster</a> and <a href="https://azure.microsoft.com/en-us/services/cache/">Azure Redis Cache</a>):
<ol>
<li>automatic master and slave servers discovery</li>
<li>automatic status and topology update</li>
<li>automatic slots change discovery</li>
</ol>
</li>
<li>Sentinel servers mode:
<ol>
<li>automatic master, slave and sentinel servers discovery</li>
<li>automatic status and topology update</li>
</ol>
</li>
<li>Master with Slave servers mode</li>
<li>Single server mode</li>
<li>Thread-safe implementation</li>
<li><a href="https://github.com/redisson/redisson/wiki/3.-operations-execution#32-reactive-way">Reactive Streams</a> API</li>
<li><a href="https://github.com/redisson/redisson/wiki/3.-operations-execution#31-async-way">Asynchronous</a> API</li>
<li>Asynchronous connection pool</li>
<li>Lua scripting</li>
<li><a href="https://github.com/redisson/redisson/wiki/6.-Distributed-objects">Distributed objects</a> 
Object holder, Binary stream holder, Geospatial holder, BitSet, AtomicLong, AtomicDouble, PublishSubscribe,
Bloom filter, HyperLogLog</li>
<li><a href="https://github.com/redisson/redisson/wiki/7.-Distributed-collections">Distributed collections</a> 
Map, Multimap, Set, List, SortedSet, ScoredSortedSet, LexSortedSet, Queue, Deque, Blocking Queue, Bounded Blocking Queue, Blocking Deque, Delayed Queue, Priority Queue, Priority Deque</li>
<li><a href="https://github.com/redisson/redisson/wiki/8.-Distributed-locks-and-synchronizers">Distributed locks and synchronizers</a> 
Lock, FairLock, MultiLock, RedLock, ReadWriteLock, Semaphore, PermitExpirableSemaphore, CountDownLatch</li>
<li><a href="https://github.com/redisson/redisson/wiki/9.-distributed-services">Distributed services</a> 
Remote service, Live Object service, Executor service, Scheduler service, MapReduce service</li>
<li><a href="https://github.com/redisson/redisson/wiki/14.-Integration%20with%20frameworks/#141-spring-cache">Spring Cache</a> implementation &nbsp;</li>
<li><a href="https://github.com/redisson/redisson/wiki/14.-Integration%20with%20frameworks/#142-hibernate-cache">Hibernate Cache</a> implementation</li>
<li><a href="https://github.com/redisson/redisson/wiki/14.-Integration%20with%20frameworks/#143-jcache-api-jsr-107-implementation">JCache API (JSR-107)</a> implementation</li>
<li><a href="https://github.com/redisson/redisson/wiki/14.-Integration%20with%20frameworks#144-tomcat-redis-session-manager">Tomcat Session Manager</a> implementation</li>
<li><a href="https://github.com/redisson/redisson/wiki/14.-Integration%20with%20frameworks/#145-spring-session">Spring Session</a> implementation</li>
<li><a href="https://github.com/redisson/redisson/wiki/10.-additional-features#102-execution-batches-of-commands">Redis pipelining</a> (command batches)</li>
<li>Supports Android platform</li>
<li>Supports auto-reconnection</li>
<li>Supports failed to send command auto-retry</li>
<li>Supports OSGi</li>
<li>Supports SSL</li>
<li>Supports many popular codecs (<a href="https://github.com/FasterXML/jackson">Jackson JSON</a>, <a href="http://avro.apache.org/">Avro</a>, <a href="http://wiki.fasterxml.com/SmileFormatSpec">Smile</a>, <a href="http://cbor.io/">CBOR</a>, <a href="http://msgpack.org/">MsgPack</a>, <a href="https://github.com/EsotericSoftware/kryo">Kryo</a>, <a href="https://amzn.github.io/ion-docs/">Amazon Ion</a>, <a href="https://github.com/RuedigerMoeller/fast-serialization">FST</a>, <a href="https://github.com/jpountz/lz4-java">LZ4</a>, <a href="https://github.com/xerial/snappy-java">Snappy</a> and JDK Serialization)</li>
<li>With over 1000 unit tests</li>
</ul>

Redisson - distributed Java objects and services (Set, Multimap, SortedSet, Map, List, Queue, BlockingQueue, Deque, BlockingDeque, Semaphore, Lock, AtomicLong, Map Reduce, Publish / Subscribe, Bloom filter, Spring Cache, Executor service, Tomcat Session Manager, Scheduler service, JCache API) on top of Redis server. Rich Redis client.

Redisson - Redis based In-Memory Data Grid for Java

Redisson - Distributed and Scalable Java data structures (Set, SortedSet, Map, ConcurrentMap, List, Queue, Deque, Lock, AtomicLong, CountDownLatch, Publish / Subscribe, HyperLogLog) on top of Redis server. Advanced redis java client. It supports over 28+ data structures and services, Synchronous / asynchronous / reactive interfaces and lot more.

A library for managing large off-heap arrays that can hold more than 2G (2^31) entries in Java and Scala. Notably LArray is disposable by calling LArray.free or you can let GC automatically release the memory. LArray also can be used to create an mmap (memory-mapped file) whose size is more than 2GB

LArray - Large off-heap arrays for Java/Scala

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Guava - Google Core Libraries for Java

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Guava - Google Core Libraries for Java

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