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From Stephan Ewen <se...@apache.org>
Subject Re: Cluster installation gives java.lang.NoClassDefFoundError for everything
Date Wed, 11 Nov 2015 08:35:41 GMT
Hi!

Flink requires at least Java 1.7, so one of the reasons could also be that
the classes are rejected for an incompatible version (class format 1.7, JVM
does not understand it since it is only version 1.6).

That could explain things...

Greetings,
Stephan


On Wed, Nov 11, 2015 at 9:01 AM, Camelia Elena Ciolac <camelia@chalmers.se>
wrote:

> Good morning,
>
> Thank you Stephan!
>
> I keep on testing and in the meantime I'm wondering if the Java version on
> the cluster may be part of the issue:
> java version "1.6.0_36"
> OpenJDK Runtime Environment (IcedTea6 1.13.8) (rhel-1.13.8.1.el6_7-x86_64)
> OpenJDK 64-Bit Server VM (build 23.25-b01, mixed mode)
> ?
>
> The cluster has shared network file system, so no problem in this aspect.
> I keep on trying and I've put some echo's for debugging in the Flink start
> scripts.
>
> Best regards,
> Camelia
>
>
>
> ------------------------------
> *From:* Camelia Elena Ciolac
> *Sent:* Monday, November 09, 2015 2:32 PM
> *To:* user@flink.apache.org
> *Subject:* Cluster installation gives java.lang.NoClassDefFoundError for
> everything
>
> Hello,
>
> I am configuring Flink to run on a cluster with NFS.
> I have the Flink 0.9.1 distribution in some path in NFS and I added that
> path in ~/.bashrc as FLINK_HOME, and also included the $FLINK_HOME/lib
> folder to $PATH.
> I have the slaves file and the yaml file configured correctly with the
> nodes involved.
>
> Still, when I run the following command I get the following errors:
>
> $FLINK_HOME/bin/start-cluster.sh
>
> (tried also
> cd $FLINK_HOME
> ./bin/start-cluster.sh)
>
> --> in /log/flink-theuser-jobmanager-thenode.out
> Exception in thread "main" java.lang.NoClassDefFoundError:
> org/apache/flink/runtime/jobmanager/JobManager
> Caused by: java.lang.ClassNotFoundException:
> org.apache.flink.runtime.jobmanager.JobManager
>     at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
>     at java.security.AccessController.doPrivileged(Native Method)
>     at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
>     at java.lang.ClassLoader.loadClass(ClassLoader.java:323)
>     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
>     at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
> Could not find the main class:
> org.apache.flink.runtime.jobmanager.JobManager. Program will exit.
>
> -->in /log/flink-theuser-taskmanager-theslavenode.out
> Exception in thread "main" java.lang.NoClassDefFoundError:
> org/apache/flink/runtime/taskmanager/TaskManager
> Caused by: java.lang.ClassNotFoundException:
> org.apache.flink.runtime.taskmanager.TaskManager
>     at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
>     at java.security.AccessController.doPrivileged(Native Method)
>     at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
>     at java.lang.ClassLoader.loadClass(ClassLoader.java:323)
>     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
>     at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
> Could not find the main class:
> org.apache.flink.runtime.taskmanager.TaskManager. Program will exit.
>
>
> And lastly, in my script I have the run of a job which gives:
>
> Exception in thread "main" java.lang.NoClassDefFoundError:
> org/apache/flink/client/CliFrontend
> Caused by: java.lang.ClassNotFoundException:
> org.apache.flink.client.CliFrontend
>     at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
>     at java.security.AccessController.doPrivileged(Native Method)
>     at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
>     at java.lang.ClassLoader.loadClass(ClassLoader.java:323)
>     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
>     at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
> Could not find the main class: org.apache.flink.client.CliFrontend.
> Program will exit.
>
> What could be the cause and which is the solution?
>
> Looking forward to your answer as soon as possible.
> Many thanks,
> Camelia
>
>

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