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From Douglas Service <dsop...@gmail.com>
Subject Re: HelloREEF runs on Windows but not on Linux
Date Sat, 12 Nov 2016 02:09:47 GMT
Either way we should probably put a note about JAVA_HOME on the tutorials
page on the REEF Wiki in case the user still has problems. I can add the
information to the Wiki. I can also update the code based on what we decide.

Doug

On Fri, Nov 11, 2016 at 6:02 PM, Douglas Service <dsopsrc@gmail.com> wrote:

> Both the Java and CLR versions of HelloReef run fine on windows.
>
> However on Ubuntu I had to set the JAVA_HOME to
> /usr/lib/jvm/java-8-oracle/jre to get the HelloREEF to run correctly. I do
> not know about other Linux distributions, but on Ubuntu, the
> update-alternatives functionality, which is enabled by default even only
> one version of java is installed, puts links in /usr/bin for java, jar, jdb
> etc. This causes all of the java programs to appear in the user's usual
> path because /usr/bin is always included in the user's path by default
> unless they specifically remove it. Plus they always get the version of
> java controlled by "update-alternatives --config java". If this is the case
> on other Linux distributions, we should use JAVA_HOME if it is set,
> otherwise we should just rely on the user's path when we invoke java.
>
> Doug
>
>
> On Thu, Nov 10, 2016 at 4:32 PM, Sergiy Matusevych <
> sergiy.matusevych@gmail.com> wrote:
>
>> hi Douglas,
>>
>> The fix is in the master now - please go ahead and give it a try.
>>
>> Cheers,
>> Sergiy.
>>
>> On Mon, Nov 7, 2016 at 6:00 PM, Sergiy Matusevych <
>> sergiy.matusevych@gmail.com> wrote:
>>
>> > OK I think I'll create a PR for this. Here goes: https://github.com/
>> > apache/reef/pull/1179
>> >
>> > Cheers,
>> > Sergiy.
>> >
>> > On Mon, Nov 7, 2016 at 5:36 PM, Sergiy Matusevych <
>> > sergiy.matusevych@gmail.com> wrote:
>> >
>> >> Hi Douglas,
>> >>
>> >> I think I know what's going on. The key is this line:
>> >>
>> >> public final class JavaLaunchCommandBuilder implements
>> >> LaunchCommandBuilder {
>> >>   // ...
>> >>   private static final String DEFAULT_JAVA_PATH =
>> >> System.getenv("JAVA_HOME") + "/bin/" + "java";
>> >>
>> >> That is, *by default* REEF client assumes that
>> >>   1) you have JAVA_HOME environment variable set, and
>> >>   2) your JAVA_HOME is the same as the one on the remote host.
>> >>
>> >> I am not sure this is the best default value. I would rather set
>> >> DEFAULT_JAVA_PATH = "java"; and assume that java binary is in the
>> system
>> >> PATH - on both client and in the cluster.
>> >>
>> >> I've actually made that fix to debug REEF applications on my PC, but I
>> >> can transform it into a pull request in no time.
>> >>
>> >> Markus, what do you think? I would love to file a JIRA and a PR for
>> this.
>> >>
>> >> Cheers,
>> >> Sergiy.
>> >>
>> >> On Tue, Oct 4, 2016 at 9:00 PM, Douglas Service <dsopsrc@gmail.com>
>> >> wrote:
>> >>
>> >> > When I run HelloREEF on Linux following the instructions on the
>> >> developer
>> >> > WIKI, I get the following errors which looks like it is having a
>> problem
>> >> > finding java.
>> >> >
>> >> >
>> >> > dougse@reefdevlx:/code/reef$ java -cp lang/java/reef-examples/
>> >> > target/reef-examples-0.16.0-SNAPSHOT-shaded.jar
>> >> org.apache.reef.examples.
>> >> > hello.HelloREEF
>> >>
>> >> [...]
>> >>
>> >> > SEVERE: Unable to spawn process "driver" wth command [null/bin/java,
>> >> > -Xmx512m, -XX:PermSize=128m, -XX:MaxPermSize=128m, -classpath,
>> >> > reef/local/*:reef/global/*:/code/reef/lang/java/reef-
>> >> > examples/target/reef-examples-0.16.0-SNAPSHOT-shaded.jar,
>> -Dproc_reef,
>> >> > org.apache.reef.runtime.common.REEFLauncher, reef/local/driver.conf]
>> >> >  Exception:java.io.IOException: Cannot run program "null/bin/java"
>> (in
>> >> > directory "/code/reef/REEF_LOCAL_RUNTIME/HelloREEF-1475636573040/
>> >> driver"):
>> >> > error=2, No such file or directory
>> >>
>> >>
>> >
>>
>
>

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