Did someone manage to install java from source and run
"java -version "?
Unfortunately it just freezes in my case

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I installed oracle JDK 1.7 successfully. Just download and extract it on windows, put it in your Linux folder, then will be OK.

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Thanks all. I was able to follow these instructions and get java up and running: http://xubuntugeek.blogspot.com/2012/09/how-to-install-oracle-jdk-7-manually-in.html.

To do this, I downloaded jdk-8u77-linux-x64.tar.gz to /mnt/c/temp and installed to /usr/lib/jvm/. Successfully ran a very simple HelloWorld app.

russ@RUSSALEX-DESK:/mnt/d/dev/samples/java$ java -version
java version "1.8.0_77"
Java(TM) SE Runtime Environment (build 1.8.0_77-b03)
Java HotSpot(TM) 64-Bit Server VM (build 25.77-b03, mixed mode)
russ@RUSSALEX-DESK:/mnt/d/dev/samples/java$ java HelloWorldApp
Hello World!
russ@RUSSALEX-DESK:/mnt/d/dev/samples/java$

That said, we obviously have a bug against the install. Writing that one now.

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I myself have the same issue

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I see openjdk failing but through ca-certificates-java package and it seems due not seeing /proc as a mountpoint.

root@localhost:/# mountpoint /proc
/proc is not a mountpoint

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FYI: I've fixed the issue preventing default-jdk from installing (the java command requires a mounted proc fs (/proc)). The fix will be making its way to the Windows Insider fast ring in the next few weeks. Keep an eye out for our release notes.

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This thread has forked a number of times. Let's do the following:

• Closing this one as "fixed" since apt-get install jre/jdk default is working.

• Let's use #196 for Gradle support

• Oracle JDK SE is working following @rs6g10's instructions above but has issues installing from apt-get (instructions below). #315 is tracking that one.

  $ sudo add-apt-repository ppa:webupd8team/java
  $ sudo apt-get update
  $ sudo apt-get install oracle-java8-installer

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I've had the same issue as well. After spending way too long messing around with dpkg, and manual installations, I THINK this issue is ultimately being caused by tar's inability to handle symlinks correctly right now (Issue #9), as other packages suffer similar problems as Java. I'm sure there's probably more too it than just that, though.

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@amadib I just tried it on mine (Insider build 14342). java/javac 8u5 does seem to run alright, and I can compile and run the most basic Hello World program both as a bare class file AND as a jar file, but even so, Gradle does NOT work (tried versions 2.4, 2.5 and 2.12). Just hangs like newer versions of Java do. Really wish this ran, then I could actually start using Bash for my development :-)

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Yep sure is. I think it's in our FAQ but I'm on my phone so I don't have a link. Do the following:

Lxrun.exe /uninstall /full

Then reinstall with Bash.exe

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@seancorfield Here are the instructions if you are still looking for them. How do I fully uninstall WSL?

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As per comment from @russalex , I managed to install it manually. Here are the steps for those who want a full walkthrough:

Installing Oracle JDK Java SE Development Kit 8 x64 bits

Download Oracle JDK

wget --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u5-b13/jdk-8u5-linux-x64.tar.gz

Then...

sudo su

The /opt directory is reserved for all the software and add-on packages that are not part of the default installation. Create a directory for your JDK installation:

mkdir /opt/jdk

and extract java into the /opt/jdk directory:

tar -zxf jdk-8u5-linux-x64.tar.gz -C /opt/jdk

Verify that the file has been extracted into the /opt/jdk directory.

ls /opt/jdk

## Setting Oracle JDK as the default JVM
In our case, the java executable is located under /opt/jdk/jdk1.8.0_05/bin/java . To set it as the default JVM in your machine run:

update-alternatives --install /usr/bin/java java /opt/jdk/jdk1.8.0_05/bin/java 100

and

update-alternatives --install /usr/bin/javac javac /opt/jdk/jdk1.8.0_05/bin/javac 100

Verify your installation
Verify that java has been successfully configured by running:

update-alternatives --display java

Output should look like this:

java - auto mode
link currently points to /opt/jdk/jdk1.8.0_05/bin/java
/opt/jdk/jdk1.8.0_05/bin/java - priority 100
Current 'best' version is '/opt/jdk/jdk1.8.0_05/bin/java'.

and then run this

update-alternatives --display javac

Output should look like this:

javac - auto mode
link currently points to /opt/jdk/jdk1.8.0_05/bin/javac
/opt/jdk/jdk1.8.0_05/bin/javac - priority 100
Current 'best' version is '/opt/jdk/jdk1.8.0_05/bin/javac'.

And Finally!

java -version

Output should look like this:

java version "1.8.0_05"
Java(TM) SE Runtime Environment (build 1.8.0_05-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.5-b02, mixed mode)

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Everyone should be able to run apt-get install default-jre on build 14352.

This build fixes quite a few issues. I have not tried Gradle but it's worth giving another shot.

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I am seeing the same problem in installation, and I also noticed:

1. This is not a symlink issue. ls -al inside /usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/server/ shows the symlink is correctly created.
2. I can run /usr/lib/jvm/java-7-openjdk-amd64/bin/javac directly (yes, I installed jdk) and the help screen shows up.
3. However, running "/usr/lib/jvm/java-7-openjdk-amd64/bin/javac A.java" with a super-slim A.java hangs forever. Even Ctrl-C cannot kill it.

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I get this issue as well while attempting to set up for building Android. http://source.android.com/source/initializing.html#setting-up-a-linux-build-environment

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I tried manually installing java 7 from oracle mentioned on this page: http://xubuntugeek.blogspot.com/2012/09/how-to-install-oracle-jdk-7-manually-in.html
When I execute the command: sudo tar -zxvf jdk*.tar.gz -C /usr/lib/jvm/
I get this error:
tar: jdk1.7.0_80/jre/lib/amd64/server/libjsig.so: Cannot create symlink to ‘../libjsig.so’: Invalid argument
tar: Exiting with failure status due to previous errors

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I have the same issue as well. I tried to install openjdk-7-jdk, and the default-jdk, but get the error at the end. I can actually navigate to /usr/lib/jvm/ and see all folders, and also I can set the JAVA_HOME to check the java version and javac version. I tried the same thing as wangweij and ran javac, which showed help. But, again, javac test.java hangs. (You can kill it by Ctrl+z however.) Test file was a hello world.

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@Esgariot what does it mean install from source? compile?
@jznomoney this is a known problem #9, but you can manually recreated it.

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Russ - are you running a later version of the linux subsystem or what has been released publicly? I cannot get java to run no matter what I do. It just hangs.

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This test was a developer build. Can't give an ETA (simply because I don't have one to give) but fixes should be heading down the pipe soon.

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@russalex Good to hear there are fixes coming. If, in trying to resolve various apt-get failures on various packages, we've gotten Ubuntu into a bit of a mess, is there an easy way to uninstall & reinstall it or reset it to the pristine version that Windows 10 first installs?

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Thank you @sunilmut -- somehow I'd missed the FAQ completely.

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Build 14328 is now public. You should be able to get Java working using the manual commands under a non-mnt/drive directory.

Release notes are here: https://msdn.microsoft.com/en-us/commandline/wsl/release_notes and contain a link to the instructions I followed to get Java up and going.

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It is still not working for me on 14328. I reinstalled bash and tried again, but still no luck. It hangs at "java -version". I downloaded the jdk to c directory on windows, did the tar command to the /usr/lib/jvm/ from /mnt/c, then followed the instruction on the website.

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Can you strace the Java -version execution? I wonder were it's hanging?
On Apr 23, 2016 12:24 AM, "jhl9092" [email protected] wrote:

It is still not working for me on 14328. I reinstalled bash and tried
again, but still no luck. It hangs at "java -version". I downloaded the jdk
to c directory on windows, did the tar command to the /usr/lib/jvm/ from
/mnt/c, then followed the instruction on the website.

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#49 (comment)

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I saw issue yesterday and updated to 14328.rs1_release.160418-1609 and tried reinstalling this morning first following these instructions where it's spitting out a bunch of errors. http://www.pastebucket.com/313262

Running apt-get install default-jdk I get the following error http://www.pastebucket.com/313273

I then tried to use the instructions @russalex posted above and it hangs on java -version.
I ran strace java -version and here's the output: http://www.pastebucket.com/313261

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After uninstalling wsl and following this:
https://www.digitalocean.com/community/tutorials/how-to-manually-install-oracle-java-on-a-debian-or-ubuntu-vps

with jdk 7 it worked. Mine would hang as well.

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is the strace complete? the last line is not a full line:
"futex(0x7ff5ffe209d0, FUTEX_WAIT, 7295, NULL"

I would say futex's are buggy but, earlier in the trace shows a futex call
working.

Hmmm, the earlier call doesn't show a well functioning futext:
"futex(0x7ff5fffef690, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 1,
NULL, 7ff5ffeb0740) = -1 EAGAIN (Resource temporarily unavailable)"

I am wondering if the futext sys call is not well implemented and hangs or
maybe java is deadlocking on the second attempt at calling futext...

If there are any dev's following this thread can we get a report out of
what sys-calls are tested / thought to be working in windows/linux
subsystem? (I guess I can try to run part of the LTP to see a partial
list).

--mark

On Sat, Apr 23, 2016 at 1:27 PM, Caleb Viola [email protected]
wrote:

After uninstalling wsl and following this:

https://www.digitalocean.com/community/tutorials/how-to-manually-install-oracle-java-on-a-debian-or-ubuntu-vps

with jdk 7 it worked. Mine would hang as well.

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#49 (comment)

create interesting things.

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I uninstalled and reinstalled wsl and followed @cuzox instructions only upping the version to 8u91 and still hangs when I run java -version
http://www.pastebucket.com/313830

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I'm having the same problem that @amadib installing java (8u91) in the newest build (14328) following @russalex installation step-by-step. Here is the tracelog for java -version: http://www.pastebucket.com/313831

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@ianvieira I installed java 7 not sure if it works yet...@cuzox can you try to run./gradlew and see if works for you? I'm having a crash now with that... opened #252

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@amadib in fact the Java 7 works using @russalex installation. But I'm not sure if I can use Java 7 in my environment.

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Here is my strace of java -version, with java8u91 installed with the instruction from @russalex : http://pastebucket.com/314592
I saw that futex was hanging, so I tried the strace with the -f option to trace the child, and it actually finished.. There's a SIGSEGV at the end, but I'm not sure the significance of this... but here it is: http://pastebucket.com/314613

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I tried JDK 8u92 and reproduced the java -version hang. I tried JDK 7u79 and that seems to work fine.

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Excellent :)
On Apr 29, 2016 3:17 PM, "Ben Hillis" [email protected] wrote:

FYI: I've fixed the issue preventing default-jdk from installing (the java
command requires a mounted proc fs (/proc)). The fix will be making its way
to the Windows Insider fast ring in the next few weeks. Keep an eye out for
our release notes.

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#49 (comment)

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@rs6g10 does it work? can you run maven or gradle?

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Confirmed: installed default-jre and default-jdk smoothly and I can now run Leiningen (Clojure build tool) for certain tasks, but not lein repl to produce an interactive REPL unfortunately, and Boot (the other main Clojure build tool) still hangs on every action. But this is definitely a big improvement -- thank you!

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@russalex Indeed, apt-get install default-jdk works beautifully! This is a fantastic update and much smoother.

Gradle, unfortunately, still hangs :-/ Tried versions 2.4 up through 2.13 (the current version), all with the same behavior. I would be happy to run any command or provide any further feedback that might help. Thank you for everyone's extremely hard work!

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Update: It's worth noting that I just tried sudo apt-get install gradle and it DID install without a hitch. gradle -v correctly displays the version (painfully old 1.4). Actually trying to use it on our project, however, just hangs like always. It's for the old-version reason that I would really love for newer versions of Java/Gradle from the developer's sites to correctly run.

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@mphaney Since this issue is considered "fixed" as far as Java is concerned, maybe updating #196 and focusing on that for Gradle is worthwhile? I did the same thing for Leiningen / Boot (Clojure's build tools) in #277 (no response yet from @russalex et al -- hint, hint 😄 ).

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I am installing open-jdk using these instructions
http://ubuntuhandbook.org/index.php/2015/01/install-openjdk-8-ubuntu-14-04-12-04-lts/

And it hanged updating alternatives:

update-alternatives: using /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/jexec to provide /usr/bin/jexec (jexec) in auto mode

(well I am going to let it sit to see if it ever times out or completes)

But it went much further than it has ever done before!

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me too.
I think this bug may like that one https://bugzilla.kernel.org/show_bug.cgi?id=32922

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Tracking Gradle errors in #851

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@rs6g10 many thanks!! worked fine.

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