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I am trying to install the ARM64 version of Java on my Raspberry Pi model 4.

I have already added arm_64bit=1 to the /boot/config.txt file and running uname -a returns Linux pi4 5.10.17-v8+ #1403 SMP PREEMPT Mon Feb 22 11:37:54 GMT 2021 aarch64 GNU/Linux. This shows that I am running the 64-bit kernel.

Installing JRE 11 with sudo apt install default-jre seems to be installing the 32-bit version of Java 11.

I first thought that apt was installing the 32-bit version and I had to change it to the ARM64 architecture so I followed this answer from another question. This only lead to more errors when I went to sudo apt update and didn't install the 64-bit version.

So the next thing I tried was dowloaded an aarch64 version of OpenJDK11. I did the following (slightly modified from here):

cd /home/pi/
wget https://cdn.azul.com/zulu-embedded/bin/zulu11.35.36-ca-jdk11.0.5-linux_aarch64.tar.gz
tar -xvzf zulu*tar.gz
mv zulu11.35.36-ca-jdk11.0.5-linux_aarch64 java-11-zulu-aarch64
mv java-11-zulu-aarch64 /usr/lib/jvm/java-11-zulu-aarch64
sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/java-11-zulu-aarch64/java 1091

After I had set update-alternatives with the newly installed Java:

  Selection    Path                                            Priority   Status
------------------------------------------------------------
  0            /usr/lib/jvm/java-11-openjdk-armhf/bin/java      1111      auto mode
  1            /usr/lib/jvm/java-11-openjdk-armhf/bin/java      1111      manual mode
* 2            /usr/lib/jvm/java-11-zulu-aarch64/bin/java       1091      manual mode
  3            /usr/lib/jvm/java-8-openjdk-armhf/jre/bin/java   1081      manual mode

Running java -version outputs this:

-bash: /usr/bin/java: No such file or directory

What am I doing wrong and how can I get an installation of ARM64 Java JDK on my Raspberry Pi Model 4?

Could it be a possibility that I needed to have flashed the 64-bit Raspbian Lite OS from here, rather than flashing the 32-bit then setting arm_64bit=1?

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Could it be a possibility that I needed to have flashed the x64 Raspbian Lite OS from here, rather than flashing the x32 then setting arm_64bit=1?

Looks like it. The flag just means run the kernel in 64-bit mode. All the applications and libraries will still be 32-bit.

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  • I see, is there a way to change apt to install ARM64 based programs, or do I need to make lower-level modifications to achieve this? If I need to make lower-level modifications, then I think it'll be easier to just reinstall the OS making sure I use the 64-bit version
    – SidS
    Commented Mar 18, 2021 at 18:40
  • you need to install the beta 64bit OS - downloads.raspberrypi.org/raspios_arm64/images
    – Jaromanda X
    Commented Mar 18, 2021 at 22:57
  • The raspios_lite_arm64 from here should be fine too right? I was thinking of going with the lite version as I'm going to be running it headless
    – SidS
    Commented Mar 19, 2021 at 13:32
  • Just installed the raspios_lite_arm64 image on the Pi, and after updating then running sudo apt install default-jdk, the 64-bit JDK installs successfully. I guess this answers my question - settings the arm_64bit flag isn't enough, you have to install the actual 64-bit OS
    – SidS
    Commented Mar 19, 2021 at 14:15

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