Hello everyone.
I’m new in using raspberry pi and I’ve encounter some problem in installing my local blynk server.
When I type
sudo apt-get install oracle-java8-jdk
I have this error saying…
Package oracle-java8-installer is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source.
Package ‘oracle-java8-installer’ has no installation candidate
And this is why I cant proceed to the next step.
Can somebody help me plss??
root@raspberrypi:~# $sudo apt install openjdk-11-jre
Paketlisten werden gelesen… Fertig
Abhängigkeitsbaum wird aufgebaut.
Statusinformationen werden eingelesen… Fertig
E: Paket openjdk-11-jre kann nicht gefunden werden.
root @ raspberrypi: ~ # $ sudo apt install openjdk-11-jre
Package lists are read … Done
Dependency tree is set up.
Status information is read … Done
E: package openjdk-11-jre can not be found.
Did you try to update the package lists with the following command before running ?
$sudo apt update $sudo apt install openjdk-11-jre
Which Raspberry Pi model and Raspbian version you are using?
You can find out by
$uname -a
giving output like this for RPi 3 running latest Raspbian Buster:
Linux raspberrypi-02 4.19.75-v7+ #1270 SMP Tue Sep 24 18:45:11 BST 2019 armv7l GNU/Linux
To run Java 11 on the old Raspberry Pi Zero (W) not using newer ARMv7 CPU, you have to use Zulu OpenJDK. See this forum’s discussion:
If you’re running RPi 3/3+/4, we have to dig deeper to see why you have this issue.
You’re running very old Raspbian Jessie, and I’m afraid it’s no longer be supported and updated with new packages.
I suggest you install newer Raspbian OS, such as Stretch or Buster (the latest).
Go to
yes, use Jessie. Problem is still, that runs on this Hyperion for an Ambilight. Had then only in addition the Blynksrver installed with in order not to use a new / different RPi. Would Hyperion also run on the new version?
Because currently runs the Blynkserver yes with java 8 quite stable
I’m sorry I don’t fully understand because the translation loss.
I don’t know what Hyperion is, unless in Greek mythology. Is it another model of RPi?
But I guess it’s still OK if you can still run Java 8 as Blynk Server still supports, at least for now.
To update RPi from Raspbian Jessie to latest Buster, you can try these commands (but be sure to back up everything before doing)
have now set up a new microsd card with the latest Rspianimage and installed Java. Nevertheless, I have a problem, the server does not start.
....
Vorbereitung zum Entpacken von .../openjdk-11-jre_11.0.5+10-1~deb10u1_armhf.deb ...
Entpacken von openjdk-11-jre:armhf (11.0.5+10-1~deb10u1) ...
openjdk-11-jre:armhf (11.0.5+10-1~deb10u1) wird eingerichtet ...
libatk-wrapper-java (0.33.3-22) wird eingerichtet ...
libatk-wrapper-java-jni:armhf (0.33.3-22) wird eingerichtet ...
Trigger für mime-support (3.62) werden verarbeitet ...
Trigger für hicolor-icon-theme (0.17-2) werden verarbeitet ...
Trigger für gnome-menus (3.31.4-3) werden verarbeitet ...
Trigger für libc-bin (2.28-10+rpi1) werden verarbeitet ...
Trigger für desktop-file-utils (0.23-4) werden verarbeitet ...
root@raspberrypi:/home/pi# java --version
Ungültiger Maschinenbefehl
root@raspberrypi:/home/pi# cd blynk
root@raspberrypi:/home/pi/blynk# java -jar server-0.41.11.jar -dataFolder /home/pi/blynk log &
[1] 2047
root@raspberrypi:/home/pi/blynk#
One note is that you’d better not use root account in everyday job. One small mistake can destroy your system. Use pi or whatever account you create but root. Whenever you need root privilege, use sudo. Also change the default root and pi password.
My server works perfectly until I close the terminal where the server was installed. The server disconnect(goes offline). Is there anyway tjat the Server runs even though I close the terminal? And the auto restart doest work for me… I followed the instruction about crontab -e but the problem is still there
To make the process still working after you close the terminal you run the command, you have to put the process to work in background by putting an Ampersand & at the end of the command.
To make the Blynk Server working after restarting the RPi, you need to put the command in /etc/rc.local. You can use nano text editor to do that.
pi@raspberrypi-02:~ $ sudo nano /etc/rc.local
#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.
# Print the IP address
_IP=$(hostname -I) || true
if [ "$_IP" ]; then
printf "My IP address is %s\n" "$_IP"
fi
# Add this line before exit 0
java -jar /home/pi/Blynk/server-0.41.11.jar -dataFolder /home/pi/Blynk &
exit 0
then press Ctrl-O to Write-Out or Save. Finally Ctrl-X to exit.
