After having installed openjdk
sudo pacman -S jre-openjdk-headless jre-openjdk jdk-openjdk openjdk-doc openjdk-src
but when I want to compile a java program I get this error:
bash: javac: command not found
Any help is appreciated!
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It sounds like your PATH doesn’t include the Java bin directory. I don’t know where it goes in Arch, but in CentOS, it’s /usr/lib/jvm... somewhere. I’m not at my desk at the moment to verify.
That binary is provided by java-environment-common which is a dependency of jdk-openjdk, so you should already have it.
What’s the output of:
which javac
and
echo $PATH
It’s /usr/lib/jvm/default/bin.
$ which javac
which: no javac in (/home/kunruh/.local/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/var/lib/flatpak/exports/bin:/usr/lib/jvm/default/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl:/var/lib/snapd/snap/bin)
$ echo $PATH
/home/mordechai/.local/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/var/lib/flatpak/exports/bin:/usr/lib/jvm/default/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl:/var/lib/snapd/snap/bin
I tried to add this java directory temporarily to my PATH variable (export PATH=$PATH:/usr/lib/jvm/default/bin) however javac was still not found. Which is coherent because the directory does not contain the javac binary:
$ ls /usr/lib/jvm/default/bin
java keytool pack200 rmid servertool unpack200
jjs orbd policytool rmiregistry tnameserv
$ pacman -Si java-environment-common
Repository : extra
Name : java-environment-common
Version : 3-3
Description : Common files for Java Development Kits
Architecture : any
URL : https://www.archlinux.org/packages/extra/any/java-common/
Licenses : GPL
Groups : None
Provides : None
Depends On : None
Optional Deps : None
Conflicts With : None
Replaces : None
Download Size : 2,49 KiB
Installed Size : 0,00 KiB
Packager : Felix Yan <felixonmars@archlinux.org>
Build Date : Sa 16 Mai 2020 11:30:33 CEST
Validated By : MD5 Sum SHA-256 Sum Signature
$ pacman -Si java-environment-common
Repository : extra
Name : java-environment-common
Version : 3-3
Description : Common files for Java Development Kits
Architecture : any
URL : https://www.archlinux.org/packages/extra/any/java-common/
Licenses : GPL
Groups : None
Provides : None
Depends On : None
Optional Deps : None
Conflicts With : None
Replaces : None
Download Size : 2,49 KiB
Installed Size : 0,00 KiB
Packager : Felix Yan <felixonmars@archlinux.org>
Build Date : Sa 16 Mai 2020 11:30:33 CEST
Validated By : MD5 Sum SHA-256 Sum Signature
This symbolic link of java-environment-common is broken beacuse there is no javac in /usr/lib/jvm/default/bin/javac
$ stat /bin/javac
File: /bin/javac -> /usr/lib/jvm/default/bin/javac
Size: 30 Blocks: 0 IO Block: 4096 symbolic link
Device: 10302h/66306d Inode: 151476 Links: 1
Access: (0777/lrwxrwxrwx) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2020-11-22 10:11:19.000000000 +0100
Modify: 2020-05-16 11:30:33.000000000 +0200
Change: 2020-11-22 10:11:19.980221770 +0100
Birth: 2020-11-22 10:11:19.980221770 +0100
EDIT:
/usr/lib/jvm/default/ directory is currently pointing to /usr/lib/jvm/java-8-openjdk in which bin's directory there is no javac binary:
$ ls /usr/lib/jvm/java-8-openjdk/jre/bin
java keytool pack200 rmid servertool unpack200
jjs orbd policytool rmiregistry tnameserv
whereas there is a javac binary in
$ ls /usr/lib/jvm/java-14-openjdk/bin
jaotc jdeps jrunscript
jaotc.debuginfo jdeps.debuginfo jrunscript.debuginfo
jar jfr jshell
jar.debuginfo jfr.debuginfo jshell.debuginfo
jarsigner jhsdb jstack
jarsigner.debuginfo jhsdb.debuginfo jstack.debuginfo
java jimage jstat
javac jimage.debuginfo jstatd
javac.debuginfo jinfo jstatd.debuginfo
java.debuginfo jinfo.debuginfo jstat.debuginfo
javadoc jjs keytool
javadoc.debuginfo jjs.debuginfo keytool.debuginfo
javap jlink rmic
javap.debuginfo jlink.debuginfo rmic.debuginfo
jcmd jmap rmid
jcmd.debuginfo jmap.debuginfo rmid.debuginfo
jconsole jmod rmiregistry
jconsole.debuginfo jmod.debuginfo rmiregistry.debuginfo
jdb jpackage serialver
jdb.debuginfo jpackage.debuginfo serialver.debuginfo
jdeprscan jps
jdeprscan.debuginfo jps.debuginfo
So I probably just have to change this link directory but I think there is an arch tool for this. Would it have worked when I simply additionally installed the java 8 openjdk package for development?
Its archlinux-java from extra/java-runtime-common.
Which version of Java are you trying to use? Sounds like Java 8 is your default right now as you’ll see by running:
archlinux-java status
See Java - ArchWiki
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Thanks for your help!
$ archlinux-java status
Available Java environments:
java-14-openjdk
java-8-openjdk/jre (default)
I had to set the default java version with this:
sudo archlinux-java set java-14-openjdk
And now I am able to compile some java classes 
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