java serialization practice

Question

I am reading across different methods/tools to serialize objects and I'm looking for an up-to-date suggestion for my application (as I can find a lot of similar question+answers from 2012, 2010, ...).

I need to write some java objects to disk. I would love to save disk space as these objects may contain a lot of data and I would love to do it rather fast.

So far it has been done with java standard serialization but the implementation is probably not very good (no explicit serialID set, ...). I read about the kryo library but I'm a bit afraid of using 3rd party libraries as I don't know how well they are maintained/ how common is their usage. Or shall I just improve the use of the serializable interface and if yes, is there any good documentation on proper implementation?

Another very fast library is Jackson 2, which is a json library. — nmore, Aug 22 '14 at 08:35
XMLEncoder will blow up the file size for objects holding a lot of datapoints, no? — Antje Janosch, Aug 22 '14 at 09:10
isn't every (sub-)object wrapped within tags? But I might be wrong in understanding how things are saved using the xml-encoder. compared to a file written via JOS for example... — Antje Janosch, Aug 22 '14 at 11:11
There are are many java serialization libraries. Research them and find what suits you. — kazanaki, Aug 26 '14 at 10:47

score 1 · Answer 1 · answered Aug 22 '14 at 08:21

1

This solution helps to save space on disk and is based on Java standard library

ObjectOutputStream oos = new ObjectOutputStream(new GZIPOutputStream(new FileOutputStream("file")));
oos.writeObject(obj);
...

ObjectInputStream ois = new ObjectInputStream(new GZIPInputStream(new FileInputStream("file")));
obj = ois.readObject();
...

answered Aug 22 '14 at 08:21

Evgeniy Dorofeev

133,369
30
199
275

Provided that the object is `Serializable`, of course. :-) – Buhake Sindi Aug 22 '14 at 08:53
Sure, I dont think there is a solution of serializing of any object – Evgeniy Dorofeev Aug 22 '14 at 09:05

java serialization practice

1 Answers1