![]() tell hibernate to persists those objects.assign values to the fields using setters.you create a POJO (Plain Old Java Object).Opening a connection to the DB, closing connections, handling various exceptions. In short, hibernate takes care of most of what the developer had to do with JDBC, for eg. Whereas, hibernate uses a database-independent Hibernate Query Language. So If in the middle of a project you need to change your database that will require a change of code too, and of course we don’t want that. If you work with MySQL or Oracle, your queries will be different. To be more specific, writing queries to be run from your application using JDBC depends on what database you are working with. JDBC (Java Database Connectivity) is database dependent. Hibernate provides a layer of abstraction for retrieving and storing data in a database. Hibernate is an ORM (Object Relational Mapping) tool for a java programming language to develop object-based database-independent persistence logic. As an alternative, I tried the nvidia-340 driver with linux-lts on Archlinux and it does allow to suspend, but it makes the brightness control glitchy (at least in Xfce) and apparently it is becoming an abandonware (not supported by NVidia for new kernels, not included in Debian 11, the AUR maintainer only updates it for linux-lts, stuff like that).Before getting into the Hibernate Architecture, let us look at why Hibernate came into the picture and what purpose it solves for us. Perhaps it should be also possible to run an older distro that still uses the 4.x kernel like Debian 10. Not sure if the parameters solve that as well, but I didn't manage to easily trigger the freeze like I used to. I also used to have another issue with Nouveau on this machine, where Chromium with enabled hardware acceleration would freeze the laptop. For me it does seem to allow the laptop to suspend and resume. It was discovered that adding init_on_alloc=0 init_on_free=0 to kernel parameters somehow masks this bug and makes it possible to suspend. Apparently, the system freezing during suspend is a bug in Nouveau that people start seeing with the 5.x kernel. I take it that this is a T410 with an NVidia GPU, like I have. Don’t know if this is related to my problem or a red herring.ĮDIT: Going to leave this here in case someone like me finds this question. I’ve been able to change my brightness and everything. Problem is my backlight is called nv_backlight, which arch does succeed in finding. I noticed when I run journalctl -b -0 -p err.alert there is an error, “failed to get backlight or LED device ‘backlight:apci_video0’”. ![]() I already tried a few things, including switching to the LTS kernel, which went flawlessly, but didn’t change the problem whatsoever. I have been able to get to tty2 from here, but I don’t really know what to do next. If I hit any keys, the screen usually cycles between red and blue, which is weird, but it doesn’t wake up the rest of the way. ![]() If I open it after this, the screen is still black, but this time with a backlight. The little crescent moon LED turns on and the fans stop. ![]() If I close my laptop and leave it closed, i think it eventually goes into hibernation, or tries. I can’t get to a tty or anything, the only think I can do is reboot by holding down the power button. The caps lock LED doesn’t turn on and off, and WiFi indicator LED is no longer blinking. If I close the laptop and open it, the screen is black, no backlight or anything. It would take a while to explain it fully, but basically I want to make it so when I close the lid of my laptop, it suspends the laptop and presents a login screen when I open it again. I’ve hopelessly been trying to debug a problem I’ve been having for several days now. I have a fresh arch install on a thinkpad t410 with bspwm, light-dm with the gtk-greeter, and slock.
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