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Nikolas Ischenko
Java Embedded: why 8 not 11?
(one comma was missed)
April 26, 2019
backend
Raspberry PI
● Quard core 64-bit processor clocked at 1.4GHz
● 1GB LPDDR2 SRAM
● Dual-band 2.4GHz and 5GHz wireless LAN
● Bluetooth 4.2 / BLE
● Higher speed ethernet up to 300Mbps
● Power-over-Ethernet capability (via a separate
PoE HAT)
Raspberry OS
Raspberry OS
Raspberry+debian
+
Java 7
Java 8
Java 9
?
Liberica
SIZE
jrecreate --profile … --vm …
profile:
• compact1
• compact2
• compact3
vm:
• minimal
• client
• server
• all
jdeps -P yourApp.jar
Java8
jrecreate
--profile compact1
--vm minimal
Java8
jlink
--add-modules java.base
--vm minimal
--compress=2
17.5
Java11
jlink --add-modules java.base
--compress=2
0 10 20 30 40
all
server
client
minimal
--vm
Java11
jdeps --recursive --dot-output dots
tomatosKiller.jar
dot --Tpng --O dots/summary.dot
tomatosKillerPi
java.base
(java.base)
java.net.http
(java.net.http)
Graphvi
z
STARTUP TIME
By class name JVM:
● Looks the class up in a JAR
● Loads it
● Verifies byte code
● Pulls it into an internal data structure
Application Class Data Sharing
–
Xshare:aut
o
java –Xshare:dump
$JAVA_HOME/lib/server/classes.jsa
java -jar –Xshare:on tomatosKiller.jar
sudo perf stat –e cpu-clock –r100 
CDS
0 50 100 150 200
with CDS
without CDS
CDS
116ms < 160ms
MONEY
Oracle Price
Oracle Price
Oracle Price
RASPBERRY PI
300$ * 0.002 * 1 * 1.19 =
0.714$
RASPBERRY PI 3B+
300$ * 0.0075 * 4 * 1.19 =
10.71$
ACTION TIME
Feel free to write me ;)
https://github.com/NikIschenko/tomatosKillerBackend
https://github.com/NikIschenko/tomatosKillerClient
https://www.linkedin.com/in/nikolai-ischenko-1b921aa
Why Java 8 over 11 for embedded
Why Java 8 over 11 for embedded

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Why Java 8 over 11 for embedded

Editor's Notes

  1. Я к вам приехал из страны, где усы всё ещё популярны! (|:{
  2. Показать рассказать о Raspberry PI Zero W
  3. http://www.armlinux.ru/%D0%BE%D0%BF%D0%B5%D1%80%D0%B0%D1%86%D0%B8%D0%BE%D0%BD%D0%BD%D1%8B%D0%B5-%D1%81%D0%B8%D1%81%D1%82%D0%B5%D0%BC%D1%8B-%D0%B4%D0%BB%D1%8F-raspberry-pi/
  4. http://www.armlinux.ru/%D0%BE%D0%BF%D0%B5%D1%80%D0%B0%D1%86%D0%B8%D0%BE%D0%BD%D0%BD%D1%8B%D0%B5-%D1%81%D0%B8%D1%81%D1%82%D0%B5%D0%BC%D1%8B-%D0%B4%D0%BB%D1%8F-raspberry-pi/
  5. Compact1 – самая малая по размеру сборка Jrecreate – это часть Embedded JDK Jdeps появился не в java 9 а он был еще с 8 версии
  6. Что происходит когда класс грузится по имени при старте: Ищется физическое расположение класса в архиве Класс грузится в память Где верифицируется его байт код И перекладывается после верификации во внутренние структуры данных JVM И все хорошо, когда у вас сотня классов, а когда их у вас тысячи тысяч?
  7. Лучше включать класс дата шэринг опционально с параметров auto, чтобы если шейрид аркайв не был найден, то аплик не валился.
  8. TODO: поменять запуск на java11 без указания модуля из инкубатора
  9. Александр Белокрылов из компании Bell-soft любит пугать тем, что джава от Oracle стоит 300 долларов. Так ли это? Да, у оракла написала ставка в 300 долларов за джава ембеддед
  10. Александр Белокрылов из компании Bell-soft любит пугать тем, что джава от Oracle стоит 300 долларов. Так ли это? Да, у оракла написала ставка в 300 долларов за джава ембеддед
  11. Александр Белокрылов из компании Bell-soft любит пугать тем, что джава от Oracle стоит 300 долларов. Так ли это? Да, у оракла написала ставка в 300 долларов за джава ембеддед
  12. Александр Белокрылов из компании Bell-soft любит пугать тем, что джава от Oracle стоит 300 долларов. Так ли это? Да, у оракла написала ставка в 300 долларов за джава ембеддед