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JDBM provides TreeMap, HashMap and other collections backed up by disk storage. Now you can handle billions of items without ever running out of memory. JDBM is probably the fastest and the simpliest pure Java database.

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package org.apache.jdbm;

import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInput;
import java.util.ArrayList;

/**
 * An alternative to java.io.ObjectInputStream which uses more efficient serialization
 */
public class ObjectInputStream2 extends DataInputStream implements ObjectInput {


    public ObjectInputStream2(InputStream in) {
        super(in);
    }

    public Object readObject() throws ClassNotFoundException, IOException {
        //first read class data
        ArrayList info = SerialClassInfo.serializer.deserialize(this);

        Serialization ser = new Serialization(null,0,info);
        return ser.deserialize(this);
    }
}