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List:       hadoop-user
Subject:    Re: Can't construct instance of class org.apache.hadoop.conf.Configuration
From:       Ryan Cole <ryan () rycole ! com>
Date:       2012-04-30 15:31:35
Message-ID: CAD18VgZudvmb3Vi13gdB4TDjo5-k+i2m6Ps0p=EiJGo8K=B7kA () mail ! gmail ! com
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Brock,

Ah, thanks. I did not realize that you could do that. That sets the correct
CLASSPATH! Thanks.

Ryan

On Mon, Apr 30, 2012 at 10:22 AM, Brock Noland <brock@cloudera.com> wrote:

> Hi,
>
> I would try this:
>
> export CLASSPATH=$(hadoop classpath)
>
> Brock
>
> On Mon, Apr 30, 2012 at 10:15 AM, Ryan Cole <ryan@rycole.com> wrote:
> > Hello,
> >
> > I'm trying to run an application, written in C++, that uses libhdfs. I
> have
> > compiled the code and get an error when I attempt to run the application.
> > The error that I am getting is as follows: "Can't construct instance of
> > class org.apache.hadoop.conf.Configuration".
> >
> > Initially, I was receiving an error saying that CLASSPATH was not set.
> That
> > was easy, so I set CLASSPATH to include the following three directories,
> in
> > this order:
> >
> >
> >   1. $HADOOP_HOME
> >   2. $HADOOP_HOME/lib
> >   3. $HADOOP_HOME/conf
> >
> > The CLASSPATH not set error went away, and now I receive the error about
> > the Configuration class. I'm assuming that I do not have something on the
> > path that I need to, but everything I have read says to simply include
> > these three directories.
> >
> > Does anybody have any idea what I might be missing? Full exception pasted
> > below.
> >
> > Thanks,
> > Ryan
> >
> > Exception in thread "main" java.lang.NoClassDefFoundError:
> >> org/apache/hadoop/conf/Configuration
> >> Caused by: java.lang.ClassNotFoundException:
> >> org.apache.hadoop.conf.Configuration
> >>         at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
> >>         at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
> >>         at java.security.AccessController.doPrivileged(Native Method)
> >>         at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
> >>         at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
> >>         at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
> >>         at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
> >> Can't construct instance of class org.apache.hadoop.conf.Configuration
> >> node: /home/ryan/.node-gyp/0.7.8/src/node_object_wrap.h:61: void
> >> node::ObjectWrap::Wrap(v8::Handle<v8::Object>): Assertion
> >> `handle_.IsEmpty()' failed.
> >> Aborted (core dumped)
>
>
>
> --
> Apache MRUnit - Unit testing MapReduce -
> http://incubator.apache.org/mrunit/
>


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