upgrade xstream-1.1.1.jar to xstream-1.4.12.jar, confluence start error

[jwh5566]

hello , i just upgrade xstream.jar , when i restart confluence  the log output is this,  how deal this  Anyone knows ? 

[Nic Brough -Adaptavist- · Accepted solution]

Why are you upgrading bits of Confluence like this?  A lot of the code is dependent on specific ranges of libraries, so you can and will break it by randomly changing parts of it.

Best bet - undo your "upgrade".

[jwh5566]

thanks ， the reason is the xstream old version has bug, so i want to upgrade

[Nic Brough -Adaptavist-]

Ok.  You simply can not just replace bits of a system and expect it to continue to work.

If you want to upgrade a library a system like Confluence is using, will need to download the source of the system, work out all the places where the library might be used, amend them to handle the new version and recompile it all. 

Or upgrade Confluence to a version that has a newer library. 

Before you do that, I very strongly recommend undoing all your "upgrades" so that you have a standard working system, and upgrading from there.