Hello,

I'm trying to run the example from the quick start guide on Windows and I
get this error:

$ bin/hadoop jar hadoop-*-examples.jar grep input output 'dfs[a-z.]+'
Exception in thread "main" java.lang.NoClassDefFoundError:
Caused by: java.lang.ClassNotFoundException:
        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: .  Program will exit.
Exception in thread "main" java.lang.NoClassDefFoundError:
Gross\Documents\Projects\discom\hadoop-0/21/0\logs
Caused by: java.lang.ClassNotFoundException:
Gross\Documents\Projects\discom\hadoop-0.21.0\logs
        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class:
Gross\Documents\Projects\discom\hadoop-0.21.0\logs.  Program will exit.

Does anyone know what I need to change?

Thank you.

From, Drew

--
Forget the environment. Print this e-mail immediately. Then burn it.

I think the jar have some issuses where its not able to read the Main class
from manifest . try unjar the jar and see in Manifest.xml what is the main
class and then run as follows

 bin/hadoop jar hadoop-*-examples.jar <Full qualified main class> grep input
output 'dfs[a-z.]+'
On Thu, Jun 16, 2011 at 10:23 AM, Drew Gross <[EMAIL PROTECTED]> wrote:

> Hello,
>
> I'm trying to run the example from the quick start guide on Windows and I
> get this error:
>
> $ bin/hadoop jar hadoop-*-examples.jar grep input output 'dfs[a-z.]+'
> Exception in thread "main" java.lang.NoClassDefFoundError:
> Caused by: java.lang.ClassNotFoundException:
>        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
>        at java.security.AccessController.doPrivileged(Native Method)
>        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
>        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
>        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
>        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
> Could not find the main class: .  Program will exit.
> Exception in thread "main" java.lang.NoClassDefFoundError:
> Gross\Documents\Projects\discom\hadoop-0/21/0\logs
> Caused by: java.lang.ClassNotFoundException:
> Gross\Documents\Projects\discom\hadoop-0.21.0\logs
>        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
>        at java.security.AccessController.doPrivileged(Native Method)
>        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
>        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
>        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
>        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
> Could not find the main class:
> Gross\Documents\Projects\discom\hadoop-0.21.0\logs.  Program will exit.
>
> Does anyone know what I need to change?
>
> Thank you.
>
> From, Drew
>
> --
> Forget the environment. Print this e-mail immediately. Then burn it.
>

Thanks Jeff, it was a problem with JAVA_HOME. I have another problem
now though, I have this:

$JAVA:  /cygdrive/c/Program Files/Java/jdk1.6.0_26/bin/java
$JAVA_HEAP_MAX:  -Xmx1000m
$HADOOP_OPTS:  -Dhadoop.log.dir=C:\Users\Drew
Gross\Documents\Projects\discom\hadoop-0.21.0\logs
-Dhadoop.log.file=hadoop.log -Dhadoop.home.dir=C:\Users\Drew
Gross\Documents\Projects\discom\hadoop-0.21.0\ -Dhadoop.id.str-Dhadoop.root.logger=INFO,console
 -Djava.library.path=/cygdrive/c/Users/Drew
Gross/Documents/Projects/discom/hadoop-0.21.0/lib/native/
-Dhadoop.policy.file=hadoop-policy.xml
$CLASS:  org.apache.hadoop.util.RunJar
Exception in thread "main" java.lang.NoClassDefFoundError:
Gross\Documents\Projects\discom\hadoop-0/21/0\logs
Caused by: java.lang.ClassNotFoundException:
Gross\Documents\Projects\discom\hadoop-0.21.0\logs
        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class:
Gross\Documents\Projects\discom\hadoop-0.21.0\logs.  Program will
exit.

(This is with some extra debugging info added by me in bin/hadoop)

It looks like the windows style file names are causing problems,
especially the spaces. Has anyone encountered this before, and know
how to fix? I tried escaping the spaces and surrounding the file paths
with quotes (not at the same time), but that didn't help.

Drew
On Tue, Jun 21, 2011 at 6:24 AM, madhu phatak <[EMAIL PROTECTED]> wrote:
>
> I think the jar have some issuses where its not able to read the Main class
> from manifest . try unjar the jar and see in Manifest.xml what is the main
> class and then run as follows
>
>  bin/hadoop jar hadoop-*-examples.jar <Full qualified main class> grep input
> output 'dfs[a-z.]+'
> On Thu, Jun 16, 2011 at 10:23 AM, Drew Gross <[EMAIL PROTECTED]> wrote:
>
> > Hello,
> >
> > I'm trying to run the example from the quick start guide on Windows and I
> > get this error:
> >
> > $ bin/hadoop jar hadoop-*-examples.jar grep input output 'dfs[a-z.]+'
> > Exception in thread "main" java.lang.NoClassDefFoundError:
> > Caused by: java.lang.ClassNotFoundException:
> >        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
> >        at java.security.AccessController.doPrivileged(Native Method)
> >        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
> >        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
> >        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
> >        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
> > Could not find the main class: .  Program will exit.
> > Exception in thread "main" java.lang.NoClassDefFoundError:
> > Gross\Documents\Projects\discom\hadoop-0/21/0\logs
> > Caused by: java.lang.ClassNotFoundException:
> > Gross\Documents\Projects\discom\hadoop-0.21.0\logs
> >        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
> >        at java.security.AccessController.doPrivileged(Native Method)
> >        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
> >        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
> >        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
> >        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
> > Could not find the main class:
> > Gross\Documents\Projects\discom\hadoop-0.21.0\logs.  Program will exit.
> >
> > Does anyone know what I need to change?
> >
> > Thank you.
> >
> > From, Drew
> >
> > --
> > Forget the environment. Print this e-mail immediately. Then burn it.
> >

--
Forget the environment. Print this e-mail immediately. Then burn it.

Drew,
Running hadoop on windows is not supported.

You can build/test hadoop on windows using Cygwin but if you want to run,
you will face many problems.

Devaraj K
---------------------------------------------------------------------
From: Drew Gross [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, June 22, 2011 9:56 AM
To: [EMAIL PROTECTED]
Subject: Re: ClassNotFoundException while running quick start guide on
Windows.

Thanks Jeff, it was a problem with JAVA_HOME. I have another problem
now though, I have this:

$JAVA:  /cygdrive/c/Program Files/Java/jdk1.6.0_26/bin/java
$JAVA_HEAP_MAX:  -Xmx1000m
$HADOOP_OPTS:  -Dhadoop.log.dir=C:\Users\Drew
Gross\Documents\Projects\discom\hadoop-0.21.0\logs
-Dhadoop.log.file=hadoop.log -Dhadoop.home.dir=C:\Users\Drew
Gross\Documents\Projects\discom\hadoop-0.21.0\ -Dhadoop.id.str-Dhadoop.root.logger=INFO,console
 -Djava.library.path=/cygdrive/c/Users/Drew
Gross/Documents/Projects/discom/hadoop-0.21.0/lib/native/
-Dhadoop.policy.file=hadoop-policy.xml
$CLASS:  org.apache.hadoop.util.RunJar
Exception in thread "main" java.lang.NoClassDefFoundError:
Gross\Documents\Projects\discom\hadoop-0/21/0\logs
Caused by: java.lang.ClassNotFoundException:
Gross\Documents\Projects\discom\hadoop-0.21.0\logs
        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class:
Gross\Documents\Projects\discom\hadoop-0.21.0\logs.  Program will
exit.

(This is with some extra debugging info added by me in bin/hadoop)

It looks like the windows style file names are causing problems,
especially the spaces. Has anyone encountered this before, and know
how to fix? I tried escaping the spaces and surrounding the file paths
with quotes (not at the same time), but that didn't help.

Drew

Hi Drew,

I don't know if this is actually the issue or not, but the output below makes me think you might be passing Cygwin pathes into the java.exe launcher.  If that's the case, it won't work.  java.exe is pure Windows and doesn't know about '/cygdrive/c' for example (it also expects the path separator to be semicolon rather than colon).  Every once in a while when I try to use java.exe from the Cygwin CLI on my Windows box, I get bitten by this.

Sandy

> -----Original Message-----
> From: Drew Gross [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, June 21, 2011 21:26
> To: [EMAIL PROTECTED]
> Subject: Re: ClassNotFoundException while running quick start guide on
> Windows.
>
> Thanks Jeff, it was a problem with JAVA_HOME. I have another problem now
> though, I have this:
>
> $JAVA:  /cygdrive/c/Program Files/Java/jdk1.6.0_26/bin/java
> $JAVA_HEAP_MAX:  -Xmx1000m
> $HADOOP_OPTS:  -Dhadoop.log.dir=C:\Users\Drew
> Gross\Documents\Projects\discom\hadoop-0.21.0\logs
> -Dhadoop.log.file=hadoop.log -Dhadoop.home.dir=C:\Users\Drew
> Gross\Documents\Projects\discom\hadoop-0.21.0\ -Dhadoop.id.str= -
> Dhadoop.root.logger=INFO,console
>  -Djava.library.path=/cygdrive/c/Users/Drew
> Gross/Documents/Projects/discom/hadoop-0.21.0/lib/native/
> -Dhadoop.policy.file=hadoop-policy.xml
> $CLASS:  org.apache.hadoop.util.RunJar
> Exception in thread "main" java.lang.NoClassDefFoundError:
> Gross\Documents\Projects\discom\hadoop-0/21/0\logs
> Caused by: java.lang.ClassNotFoundException:
> Gross\Documents\Projects\discom\hadoop-0.21.0\logs
>         at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
>         at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
>         at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
>         at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
> Could not find the main class:
> Gross\Documents\Projects\discom\hadoop-0.21.0\logs.  Program will exit.
>
> (This is with some extra debugging info added by me in bin/hadoop)
>
> It looks like the windows style file names are causing problems, especially the
> spaces. Has anyone encountered this before, and know how to fix? I tried
> escaping the spaces and surrounding the file paths with quotes (not at the
> same time), but that didn't help.
>
> Drew
>
>
> On Tue, Jun 21, 2011 at 6:24 AM, madhu phatak <[EMAIL PROTECTED]>
> wrote:
> >
> > I think the jar have some issuses where its not able to read the Main
> > class from manifest . try unjar the jar and see in Manifest.xml what
> > is the main class and then run as follows
> >
> >  bin/hadoop jar hadoop-*-examples.jar <Full qualified main class> grep
> > input output 'dfs[a-z.]+'
> > On Thu, Jun 16, 2011 at 10:23 AM, Drew Gross <[EMAIL PROTECTED]>
> wrote:
> >
> > > Hello,
> > >
> > > I'm trying to run the example from the quick start guide on Windows
> > > and I get this error:
> > >
> > > $ bin/hadoop jar hadoop-*-examples.jar grep input output 'dfs[a-z.]+'
> > > Exception in thread "main" java.lang.NoClassDefFoundError:
> > > Caused by: java.lang.ClassNotFoundException:
> > >        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
> > >        at java.security.AccessController.doPrivileged(Native Method)
> > >        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
> > >        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
> > >        at
> > > sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
> > >        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
> > > Could not find the main class: .  Program will exit.
> > > Exception in thread "main" java.lang.NoClassDefFoundError:
> > > Gross\Documents\Projects\discom\hadoop-0/21/0\logs
> > > Caused by: java.lang.ClassNotFoundException:
> > > Gross\Documents\Projects\discom\hadoop-0.21.0\logs
> > >        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)