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#hibernate

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gdesiato

JPA frustration of the day:

Why can’t I override an @ElementCollection in a subclass?

I just want to change the table name without redefining the entire map in the concrete class! But no, JPA doesn’t support @AttributeOverride for @ElementCollection, so I’m stuck copy-pasting.

Hibernate, please, let me override collection mappings like normal fields!

crying cat
#Hibernate#JPA#ORMFrustrations
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Markus Eisele

Hibernate 7 beta 4 is now available
in.relation.to/2025/02/13/orm-
#Java #Hibernate #JakartaEE

In Relation ToHibernate 7 beta 4 is now available - In Relation To The fourth beta release of Hibernate 7 is now available. Along with many bugfixes and minor improvements, this release features the following enhancements: The brand-new Restriction, Path, and Range APIs make it easy to add programmatic restrictions to HQL queries or Jakarta Data repository methods in a completely type-safe way. The package org.hibernate.graph was completely re-engineered, fixing a number of long-standing issues with our implementation of the Jakarta Persistence EntityGraph API. StatelessSession is now able to make use of the second-level cache, reflecting the changing role of this very important API in the Hibernate ecosystem. Reactive repositories backed by Hibernate Reactive are now a documented feature of Hibernate Data Repositories. The hibernate-jfr module was enhanced to send more events to Java Flight Recorder. HQL now provides portable sha(), md5(), and hex() functions. Hibernate Processor now features much better support for inner classes.
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Dendrobatus Azureus

Do you remember me talking about this wonderful article? the one where you are taught in detail with source snippets how Linux goes bye-bye when it goes to sleep?
The article has so much in-depth details that it takes a lot of time, considerable inteligencia & knowledge to process. Contrary to others I will not only say it, I will explicitly state it is fascinating and a heavy read.

Take your time to process the article; it's worth learning this in depth, in miniatures detail, all the way down to the sources, so you know what goes on, when the power management or your Linux powered VM, or Linux powered Hardware machine, goes down, hard, inexplicable:

To you it will become explainable!

🖋️ #bash #sh #zsh #ksh #csh #tsh #PowerManagement #sleep #hibernate #Linux #POSIX #FOSS #100daysofCode #640DaysOfCode #1024DaysOfCode #programming #GCC #gplusplus #gdb

tookmund.com/2024/09/hibernati

The code snippet is from the file "kernel/power/main.c:688". It defines a static function named "decode_state" that takes a "con" argument. Inside the function, there are preprocessor directives using "#ifdef CONFIG_SUSPEND". It declares variables "state" of type "suspend_state_t", a character pointer "p", and an integer "len". The code uses "memchr" to find a newline character in a buffer and calculates the length. There's a comment "/* Check hibernation first. */" and an if statement that checks the length and a string prefix, potentially returning "PM_SUSPEND_MAX". Another "#ifdef CONFIG_SUSPEND" section includes a for loop that iterates through suspend states, comparing labels and lengths, and potentially returning the "state". Finally, the function returns "PM_SUSPEND_ON". Below the code, there's a comment stating: "Could we have figured this out just via function names? Sure, but this way we".
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Thorben Janssen

Writing an efficient persistence layer with #Hibernate (or #SpringDataJPA is simple and complicated at the same time.

It's simple because avoiding common pitfalls and following best practices is good enough for most applications.

And it's complicated because there are many of them. To make it even worse, some are tied to specific Hibernate versions and circumstances.

In this article, I summarize my most important tips to avoid and fix performance problems:

thorben-janssen.com/hibernate-

Thorben Janssen · Hibernate Performance Tuning - 2025 EditionUnlock Hibernate's best performance by following these best practices for efficient mappings and fast queries.
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Radio Azureus

Reading up on the kernel source analysis of Hybrid nation and sleep. This is an in-depth article which may even bring you into the deep end. I'm having fun studying this

Kernel Linux six.nine.nine

Story Linux bed time

tookmund.com/2024/09/hibernati

🖋️ #bash #sh #zsh #ksh #csh #WomenWhoCode #640daysofcode #301daysofcode #730daysofcode #100DaysOfCode #1000DaysOfCode #Linux #POSIX #Programming #kernel #PowerManagement #Sleep #Hibernate

Linux kernel source code Kernel/power/main.c file, line 657. It deals with system sleep states. Here's a breakdown of the code: Function: state_show Purpose: This function is likely responsible for displaying the currently available system sleep states. Logic: Initialization: char *s = buf;: A pointer s is initialized to point to the beginning of the buffer buf. This buffer will be used to store the formatted string. Available Sleep States: #ifdef CONFIG_SUSPEND: This preprocessor directive checks if the CONFIG_SUSPEND option is enabled in the kernel configuration. If so, the code proceeds to iterate through a list of possible sleep states (PM_SUSPEND_MIN to PM_SUSPEND_MAX). For each state, if the corresponding pm_states entry is non-zero, the state name is appended to the buffer using sprintf. Hibernation State: if (hibernation_available()): If hibernation is available, the string "disk" is appended to the buffer, indicating that hibernation is a possible sleep state. Return Value: If the buffer s has been modified, the function returns the number of characters written to the buffer. Otherwise, it returns 0. Overall: This function appears to be part of the system's power management mechanism, providing information about the available sleep states to other parts of the system.
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Habr

JOOQ — не замена Hibernate. Они решают разные проблемы

Последние год-полтора я натыкаюсь на статьи и доклады (особенно в англоязычном сегменте) о том, что JOOQ – это современная и более крутая альтернатива Hibernate. Скажу сразу, что я считаю JOOQ отличной библиотекой (именно библиотекой, а не фреймворком, в отличие от Hibernate). Он прекрасно справляется со своей задачей – работой с SQL в режиме статической типизации, чтобы отловить большинство ошибок на этапе компиляции. Но когда я слышу аргумент, что время Hibernate прошло и пора все писать на JOOQ, для меня это звучит примерно так же, как то, что время реляционных БД прошло и теперь нужно использовать только NoSQL. Звучит смешно? Но по меркам истории буквально вчера такие разговоры велись вполне серьезно. Я думаю, дело кроется в непонимании корневых проблем, которые решают эти два инструмента. Этой статьей я хочу ответить на эти вопросы.

habr.com/ru/articles/872562/

ХабрJOOQ — не замена Hibernate. Они решают разные проблемыПоследние год-полтора я натыкаюсь на статьи и доклады (особенно в англоязычном сегменте) о том, что JOOQ – это современная и более крутая альтернатива Hibernate. Тезисы звучат примерно так: JOOQ...
#java#hibernate#jpa
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Scientific Frontline

Oregon Health & Science University researchers have identified a process that could one day help clinicians lower body temperature in people experiencing life-threatening events, such as heart attacks or #strokes. If applied in humans, who can’t naturally #hibernate, the discovery could mimic the natural ability of certain animals to lower their body temperature during hibernation.
#Neuroscience #Medical #sflorg
sflorg.com/2025/01/ns01062501.

www.sflorg.comResearchers discover how to mimic hibernation in non-hibernating animalsA groundbreaking method to control human body temperature
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