Hey Zheng,
This is AEM code, modifying it will cause lot's of really bad things to happen in your environment.
You can do it through:
Since AEM6 run's on apache felix, you can locate the jar by checking the number you see in the /system/console
As you can see the bundle has an id.
Now, you can navigate to your launchpad/felix/ location under your AEM6 installation.
Inside the felix folder you will see different bundles
You need to choose bundle(id) with the id of your bundle in the same way as it appears in system console.
Inside the bundle(id)/version(version) you will find your jar file.
Thanks,
Peter