Could someone please let me know the steps to install Java on a Mac.
I did brew install java
I get this
Warning: openjdk 17.0.1 is already installed and up-to-date.
To reinstall 17.0.1, run:
brew reinstall openjdk
If I do java -version, I get this.
openjdk version "13.0.8" 2021-07-20
If I have navigate to /Library/Java, I have 2 empty directories.
Where is java 17 installed??
In 2023, even if you can use just brew..
brew install openjdk#17
Java will be installed here:
/usr/local/opt/openjdk#17/bin/java
For the system Java wrappers to find this JDK, symlink it with:
sudo ln -sfn /usr/local/opt/openjdk/libexec/openjdk.jdk /Library/Java/JavaVirtualMachines/openjdk.jdk
...give a try to sdkman, it's far better than brew
curl -s "https://get.sdkman.io" | bash
then open a new shell and try list to see what you could install ;-)
sdk list java
At time of writing you could use:
sdk install java 17.0.4.1-tem
Java will be installed here:
/Users/freedev/.sdkman/candidates/java/17.0.4.1-tem
Java doesn't mind if you install multiple versions. This is often required; java is not backwards compatible (it tries to change little, but e.g. the java8 to java9 transition broke a ton of stuff, much of it needless and much of it not reasonably expectable or fixable by libraries and apps, so a bunch of java apps and libraries only run on java8 - just an example).
So, yes, you have installed JDK17. Also, yes, if you just run java without specifying which one you want, you so happen to get java13 here.
To see all installed javas, you can run:
/usr/libexec/java_home -V
to 'override', you can use something like (depends on which shell you're using on your mac):
export JAVA_HOME=`/usr/libexec/java_home -v 17`
(the backticks mean: Run this then take the output of it and treat that as the 'value' of the expression. here, assign it to the JAVA_HOME env var. -v 17 requests a path to java 17. The -V option lists all and is meant for your eyeballs, not for scripts. The -v option is mostly for scripting, and that's how we're using it here).
JAVA_HOME decides which java is used by some things, but the java you get when you just type java is /usr/bin/java, and that executable is actually just a wrapper that picks a java to run from amongst all installed versions. It uses JAVA_HOME to decide which java to actually run. There are wrappers for all the common commands (javac, too). You can always run e.g. which javac to see what that actually runs; you probably see /usr/bin/javac. Everything in /usr/bin is one of these wrapper thingies that looks at JAVA_HOME and then runs the binary it finds there.
To specify version 17
brew install openjdk#17
Later I add create a link:
sudo ln -sfn /usr/local/opt/openjdk#17/libexec/openjdk.jdk \
/Library/Java/JavaVirtualMachines/openjdk-17.jdk
And use jenv to control which java version to use
To used the version installed by homebrew rather than the one installed by the OS you can get detailed information from homebrew by typing
brew info java
Currently it states
For the system Java wrappers to find this JDK, symlink it with
sudo ln -sfn /opt/homebrew/opt/openjdk/libexec/openjdk.jdk /Library/Java/JavaVirtualMachines/openjdk.jdk
openjdk is keg-only, which means it was not symlinked into /opt/homebrew,
because macOS provides similar software and installing this software in
parallel can cause all kinds of trouble.
If you need to have openjdk first in your PATH, run:
echo 'export PATH="/opt/homebrew/opt/openjdk/bin:$PATH"' >> ~/.zshrc
For compilers to find openjdk you may need to set:
export CPPFLAGS="-I/opt/homebrew/opt/openjdk/include"
For Homebrew, the package that installs the new AdoptOpenJDK is named as temurin. So you need to use below command:
brew install --cask temurin17
If you get any error like temurin cask not available then update brew using below commands:
brew update
brew tap homebrew/cask-versions
To switch quickly between different versions of java add the entries in bashrc as per your jdk versions like:
alias j8="export JAVA_HOME=`/usr/libexec/java_home -v 1.8`; java -version"
alias j17="export JAVA_HOME=`/usr/libexec/java_home -v 17`; java -version"
Steps to install
You asked:
let me know the steps to install Java on a Mac.
Download an installer free-of-cost from vendors such as Adoptium, Azul Systems, Bellsoft, Amazon, Oracle, Microsoft, SAP, and others.
Run installer app.
Quit the installer app when done.
Verify installation by typing on a command-line in Terminal.app:java --version
Delete installer app that you downloaded.
Configure your IDE to use that new Java implementation you installed.
Java location
You asked:
Where is java 17 installed??
/Library/Java/JavaVirtualMachines/
In the Finder, choose Go > Go to Folder, and paste /Library/Java/JavaVirtualMachines/.
Note that this is not the Library folder within your home folder. We are not referring to /Users/your_user_name/Library/…. We are referring to the root Library folder that applies across all the user accounts on this Mac.
You said:
I did brew install java
No need for the Homebrew package manager. If you already enjoy using the brew tool, proceed. But if new to Homebrew, skip it if your only goal is to install Java. Just use an installer for Java as you would for many Mac apps.
JavaFX
You added a tag for javafx.
Be aware that for JavaFX, you have two options:
Include the necessary OpenJFX libraries within your development project and within your final app, or …
Use a JDK that includes the JavaFX/OpenJFX libraries.
At least two vendors provide JDK installers that include the JavaFX/OpenJFX libraries:
Azul Systems (ZuluFX)
Bellsoft (LibericaFX)
This answer is specifically if you use Intellij on a Mac
Within IntelliJ, you can use the IDE to add new JDKs of selected versions from common vendors. Instructions for this are here:
Setup the project JDK
When setting up the JDK, you can either:
Select a pre-existing JDK which has been registered with the IDE OR
Use the Add JDK option to add a new JDK which you previously downloaded and installed using the method outlined in Basil's answer OR
Use the Download JDK option to choose a vendor and version of the JDK that the IDE will automatically download, install and make available for selection.
The JDKs installed by Idea will be located in the same location as outlined in Basil's answer for a manual install /Library/Java/JavaVirtualMachines/.
One common issue is that the version of the JDK registered for the project differs from the default version used in the terminal. This can sometimes mean that the app works when run in Idea, then fails when run in the terminal (or, at least that it is executed against a version of the JDK you didn't expect).
To select the version of the JDK to run in the terminal, configure the Java home setting as outlined in rzwitserloot's answer.
export JAVA_HOME=`/usr/libexec/java_home -v 17`
Also, some tools such as the openjfx maven plugin will not use the java version selected in Idea when executing a call to a JDK tool like jlink, but will instead have their own mechanism for finding a JDK to use (e.g. look at JAVA_HOME or use the Maven toolchains plugin). So it is always good to check the JAVA_HOME variable and ensure that it is set to a reasonable value, both for terminal execution and for effective use of Java development tools that may rely on it.
I think that answers here are not fully out of topic, but from my point of view, my case is exactly the same as that of the author. I had already installed java 8, 11, and 13. All of them resides at:
/Library/Java/JavaVirtualMachines/
Nevertheless when I tried to find the path of JDK 17 it resides:
/usr/local/Cellar/openjdk
I use Mac OS Big Sur and the JDK was installed with homebrew
Brew now supports searching old formulae and allowing you to install a specific version. I'm using Homebrew 3.5.2-117-gb941470
Create a local tap: brew tap-new --no-git local/openjdk
Ask Brew to find the formulae of the version you want: brew extract --version 17.0.2 openjdk local/openjdk
Install Java 17 using your new local tap: brew install openjdk#17.0.2
Link the JDK into the MacOS JVM Dir: sudo ln -sfn /usr/local/opt/openjdk#17.0.2/libexec/openjdk.jdk /Library/Java/JavaVirtualMachines/openjdk17.0.2.jdk
Check Java 17 is available: /usr/libexec/java_home -V
Set Java Home: export JAVA_HOME=$(/usr/libexec/java_home -v17)
Check current version of Java is correct...
$ java --version
openjdk 17.0.2 2022-01-18
The following method installs Java without the need for any additional tools or package managers.
Go to https://jdk.java.net/17/ and download the latest macOS archive.
Download the latest Adoptium release for the Java 17 branch by going to https://adoptium.net/temurin/releases/ and be sure to select the tar.gz version.
The archive is either for x64 (Intel CPU) or for AArch64 (Apple Silicon / M1 CPU).
Then, open a Terminal, and extract the downloaded archive to the system path for Java virtual machines:
cd Downloads
tar xzf OpenJDK17U-jdk_aarch64_mac_hotspot_17.0.5_8.tar.gz -C /Library/Java/JavaVirtualMachines
I'm using jBlas and it require libgfortran3 and tell me to install it from:
sudo apt-get install libgfortran3
But I'm using Lubuntu 20.04, which use the same packages as Ubuntu 20.04. I can't find the package here
https://packages.ubuntu.com/search?keywords=libgfortran3
So what should I do?
In short, libgfortran3 is no longer supported in Ubuntu 20.04. It depends on an older version of gcc which is no longer maintained in this version of the distribution.
As an alternative, you might want to try installing its successor package with:
sudo apt-get install libgfortran5
It will provide these files for your Ubuntu installation:
/usr/lib/x86_64-linux-gnu/libgfortran.so.5
/usr/lib/x86_64-linux-gnu/libgfortran.so.5.0.0
/usr/share/doc/libgfortran5
This way, you have an option of dynamically loading/linking against libgfortran at runtime.
Hope it helps.
If you have to use libgfortran3, you can just copy a libgfortran.so.3 in /usr/lib/x86_64-linux-gnu/.
It works for me.
I installed the Windows 10 Anniversary Update so that I could try Bash on Ubuntu on Windows. See how to install it. I wanted to see how performant it was. I then installed the Oracle Java JDK as per this article, so I could compare compilation times with the native Windows Java compiler.
I then tried to run Maven on my project, but it didn't work. Maven just hung starting. I noticed in Task Manager that the "java" process was hovering around 92% CPU.
So I tried something simple. I created a dummy Java Hello-world-like class and attempted to compile it with javac. Similarly, the "javac" process sat around 92% CPU.
I thought maybe it had something to do with running headless, but the -Djava.awt.headless=trueoption didn't make it any better.
Has anyone got this to work or have anything to try?
Update:
I also tried installing the Open JDK instead of the Oracle JDK (via sudo apt-get install openjdk-7-jdk) with the same result.
I figured it out. I couldn't use the download directly from Oracle. Instead I had to install it as per this link. Here are the steps:
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installer
I had the same experience with the Windows 10 Anniversary Update. The first Fast Track Insider Build after the Anniversary Update and later support both the oracle Java 8 installer and the open JDK 7 installer. I just verified the java -version command still works on Insider Preview Build 14951 161014-1700 from the Ubuntu subsystem's bash shell. I have run other JVM based tools from bash shell as well but not extensively.
Here is a link to an issue, Cannot install Oracle JDK 8 #315, describing both installation and JVM hang issues tracked by the BashOnWindows project.
So I am very, very new to Linux. I am also new-ish to coding. I'm currently learning Java and purchased a Samsung series 3 Chromebook for the sole purpose of practicing code (eventually moving to slick 3d).
I have JUST installed XFCE using crouton and have gotten Firefox using the Synaptic Package Manager, woohoo!
I would like to find out how/which JDK I need for this device and how to install Intellij IDEA. I've tried searching around for a little while now and feel a bit overwhelmed with all the information regarding this, not only new OS, but new architecture (ARM).
Basically my main goals are to be able to get the proper JDK and a Java IDE up and running. I have read that Intellij IDEA may or may not be available yet for the ARM processors in which case using Eclipse would be just as fine.
A bit late but just did this myself. Very simple really: Go to https://www.jetbrains.com/idea/download for the latest version of idea. While it's downloading go to the terminal and type
sudo apt-get update && sudo apt-get install openjdk-7-jdk
Once Idea is downloaded and openjdk installed, extract the idea file somewhere.
mv ~/Downloads/idea-IU*.tar.gz ~
cd ~
tar xvf idea-IU*.tar.gz
To launch idea then just go to the extracted directory and run the idea.sh in the bin directory
cd idea-IU*/bin
./idea.sh
Should start up nicely
Update:
Saying it starts up nicely was not a lie. It just doesn't stay up long. Trying to see whats going wrong. Will update with findings.
OK, so you'll also need to do the following, open idea.sh and add -jamvm to the list of arguments used to run intellij,so change this line:
IDE_JVM_ARGS=""
To this:
IDE_JVM_ARGS="-jamvm"
ALSO, you'll need to install clang ( sudo apt-get install clang ) and copy and run ( bash <scriptname>.sh /path/to/idea/bin ) this guy's shell script : https://gist.github.com/pcarrier/7560053#file-fsnotifierto-sh
OpenJDK is available in Ubuntu, and the Oracle Java SE Development Kit can be downloaded from Oracle. For the latter, you would need the "hard float ABI" version.
http://www.webupd8.org/2013/12/oracle-java-ppa-updated-with-arm-support.html might be a more user-friendly way than downloading the Oracle environment yourself.
Eclipse exists in Ubuntu too.
I have just downloaded Ubuntu. It runs much faster than my Windows XP. But, I don't know how I can set up Eclipse v4.2 (Juno), or the Java SDK. I am currently developing in the Lightweight Java Game Library, so I might need some help with that too.
Execute this in your terminal:
sudo apt-get install eclipse
sudo apt-get install openjdk-6-jdk openjdk-6-source openjdk-6-demo openjdk-6-doc openjdk-6-jre-headless openjdk-6-jre-lib
The first one installs Eclipse (you will be asked to enter your password), and the second one installs all the Java stuff you may need!
Don't install Eclipse from the Linux repositories. These repositories may not be up-to-date with the last versions released by Eclipse. A better approach is to follow the instructions in this answer from Ask Ubuntu. For Java programming, make sure you have a JDK and a JRE installed
apt-get install openjdk-7-jdk openjdk-7-jre
You can download whatever Eclipse Java IDE version suits you best from the Eclipse website (link to the Eclipse v4.4 (Luna) release).
You might want to consider installing Sun Java 6 for your Java programming needs; correct me if I'm wrong, but I feel that OpenJDK may still be lacking in some libraries and compatibilities.
If you want to install Java 6 on your machine, you can follow this guide on how to do so: https://codingforme.wordpress.com/2012/05/14/installing-oracle-java-jdk-6-or-7-on-ubuntu-12-04/
Java installation on Ubuntu:
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer
Eclipse IDE installation on Ubuntu:
Since it requires a detailed list of steps, I would suggest you to visit the blog post Install Eclipse IDE Mars in Linux Ubuntu to check out steps to install Eclipse on Linux Ubuntu.
You don't really install Eclipse - you just download the folder and run the program - just like in windows. Just make sure you download a Linux version.
To install JDK, type:
sudo apt-get install openjdk-6-jdk
You will be asked to type in your password before the installation will begin. You could also install JDK through the software manager.
Just remove all Eclipse packages typing:
sudo apt-get autoremove eclipse
And with tab find all installed Eclipse packages.
Do the same with Java.
I just reinstalled Eclipse with the command
sudo apt-get install eclipse
which also contains Java.