Copy complex object hierarchy in Java

Question

I have a complex object hierarchy that has a couple of extends.

class One { String name; Color color; List clothes; }

class Two extends One { Test test; }

class Foo { One One; Two two; }

I want to copy all the attributes of a object of class One into a new object of class say another. How to do this ? Is there any library available ?

Jonathan · Accepted Answer · 2012-07-26 00:30:41Z

4

Here are a couple:

Dozer is pretty fast and has a good number of configuration options. Orika is supposedly very fast though I have not indecently confirmed that (check out the benchmarks they posted on their site).

edited Jul 26, 2012 at 0:30

Jonathan

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answered Apr 18, 2012 at 18:54

Perception

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4 Comments

axcdnt Over a year ago

This is a nice try for an architecture I use to work with: when transforming TO to VO. It may be necessary anymore. Have you used it for something like that?

Perception Over a year ago

We use Dozer for copying entity objects to DTO's and it handles decouple objects and non-normative relationships well. The ability to define relationships in XML allows us to decouple the object representations from each other as well, which is great.

Perception Over a year ago

We are also in the middle of prototyping Orika as a replacement for Dozer, because it is supposed to be significantly faster. I can't give an expert opinion on it at the moment though.

Sidi Over a year ago

Here is the result of benchmarks integrated into Jenkins Build bit.ly/Io3Jhw

darrengorman · Accepted Answer · 2012-04-18 18:40:57Z

3

Dozer is a Java Bean to Java Bean mapper that recursively copies data from one object to another.

You can define mappings for copying object fields programmatically, with annotations or XML.

answered Apr 18, 2012 at 18:40

darrengorman

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Comments

Bruce Wang · Accepted Answer · 2012-08-28 14:32:17Z

2

Wel, I have used both orika and dozer, I can say orika is at least 10 times faster than dozer in my project after the replacement. And also orika requires less jvm heap memories. orika is faster is beacause it compile the mapping rules as a runtime java class to do the properties mapping instead of looking into the mapping rules in runtime and using java reflection to get and set the properties values in runtime.

answered Aug 28, 2012 at 14:32

Bruce Wang

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alex · Accepted Answer · 2013-07-15 09:24:49Z

1

There's another framework that is even faster than Orika, take a look there - http://inspire-software.com/confluence/display/GeDA/Benchmarks

My simple test with 4 fields in a class and 1000000 copy operations took 100ms for GeDA, 1000ms for Orika and 4000ms for Dozer

answered Jul 15, 2013 at 9:24

alex

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