deep-copy

Deep Copy implements deep copy of an object via reflection according to task.

Usage

Library itself is placed in deep-copy-core project and java com.ecwid.dev.deep.copy module.

Main utility methods are contained in CopyUtils

Due to security of modular system in the latest JDKs closed classes of modules should be opened to the library module.

It's possible that access to class of a copied object is restricted, warning message is shown and the original object will be returned.

WARNING:Unable to access package java.util of module java.base. 
Consider to add `--add-opens=java.base/java.util=com.ecwid.dev.deep.copy`
VM option to make class java.util.HashSet available for copying.

In that case the message contains hint, how to provide access to some class.

Demo App

• Example of library usage shown in deep-copy-demo project.
• Demo uses deep-copy-core library as dependency.
• Main class of the app is com.ecwid.dev.deep.copy.demo.Demo

Run

Demo could be packaged as an executable jar demo.jar and run via CLI.

mvn package
java -jar deep-copy-demo/target/demo.jar

Output of the app

Feb 02, 2023 11:27:22 AM com.ecwid.dev.deep.copy.demo.Demo main
INFO: Deep copy is being started for object : Man@4783da3f{age=20, name@378fd1ac='test', favoriteBooks@49097b5d=[Lord of the Rings]}
Feb 02, 2023 11:27:23 AM com.ecwid.dev.deep.copy.demo.Demo logObjectClone
INFO: Clone completed : java.util.HashMap.Node@515f550a-> java.util.HashMap.Node@379619aa
Feb 02, 2023 11:27:23 AM com.ecwid.dev.deep.copy.demo.Demo logObjectClone
INFO: Clone completed : java.util.HashMap.Node[]@1eb44e46-> java.util.HashMap.Node[]@cac736f
Feb 02, 2023 11:27:23 AM com.ecwid.dev.deep.copy.demo.Demo logObjectClone
INFO: Clone completed : java.util.HashMap@75a1cd57-> java.util.HashMap@123a439b
Feb 02, 2023 11:27:23 AM com.ecwid.dev.deep.copy.demo.Demo logObjectClone
INFO: Clone completed : java.util.HashSet@c2e1f26-> java.util.HashSet@7de26db8
Feb 02, 2023 11:27:23 AM com.ecwid.dev.deep.copy.demo.Demo logObjectClone
INFO: Clone completed : byte[]@1175e2db-> byte[]@36aa7bc2
Feb 02, 2023 11:27:23 AM com.ecwid.dev.deep.copy.demo.Demo logObjectClone
INFO: Clone completed : java.lang.String@378fd1ac-> java.lang.String@26f0a63f
Feb 02, 2023 11:27:23 AM com.ecwid.dev.deep.copy.demo.Demo logObjectClone
INFO: Clone completed : byte[]@4926097b-> byte[]@762efe5d
Feb 02, 2023 11:27:23 AM com.ecwid.dev.deep.copy.demo.Demo logObjectClone
INFO: Clone completed : java.lang.String@7637f22-> java.lang.String@5d22bbb7
Feb 02, 2023 11:27:23 AM com.ecwid.dev.deep.copy.demo.Demo logObjectClone
INFO: Clone completed : java.util.ImmutableCollections.List12@49097b5d-> java.util.ImmutableCollections.List12@3830f1c0
Feb 02, 2023 11:27:23 AM com.ecwid.dev.deep.copy.demo.Demo logObjectClone
INFO: Clone completed : com.ecwid.dev.deep.copy.demo.classes.Man@4783da3f-> com.ecwid.dev.deep.copy.demo.classes.Man@39ed3c8d
Feb 02, 2023 11:27:23 AM com.ecwid.dev.deep.copy.demo.Demo main
INFO: Deep copied object: Man@39ed3c8d{age=20, name@26f0a63f='test', favoriteBooks@3830f1c0=[Lord of the Rings]}