Persistent hashtable (to use with Java) [closed]

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I want to use a persistent HashTable to provide data storage for my application. Is this possible. A large well supported open-source project would be ideal.

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You have 2 options :

a) Seralize your Hashtable to file -- after all the Hashtable class implements Serializable.

b) BerkeleyDB Java Edition -- you can download this for free from Oracle. It is open source. Berkeley DB database is a b-tree. It is fairly straight forward to convert your code from HashTable to Berkeley DB .

Note that if you use simple Hashtable for storing your objects, you will run out out memory when the number of obects in Hashtable increases beyond a certain number. With Berkeley DB, there is no such limitation.

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Chronicle Map is an off-heap key-value store for Java, providing ConcurrentMap interface and (optionally) persists data to disk. Under the hood, it's implemented via memory-mapped files.