Re: Problem write on HDFS

[Owen O'Malley <om...@apache.org>]

Please direct user questions to common-user@hadoop.apache.org.

-- Owen

On Tue, Jan 25, 2011 at 3:27 AM, Alessandro Binhara <bi...@gmail.com>wrote:

> I build a servlet with a hadoop...
> i think that tomcat enviroment will be find a hadoop-core-0.20.2.jar .. but
> a get a same error
>
> *ype* Exception report
>
> *message***
>
> *description* *The server encountered an internal error () that prevented
> it
> from fulfilling this request.*
>
> *exception*
>
> javax.servlet.ServletException: Servlet execution threw an exception
>
> *root cause*
>
> java.lang.NoClassDefFoundError: Could not initialize class
> org.apache.hadoop.conf.Configuration
>         HadoopWriterLib.HadoopWriter.OpenFileSystem(HadoopWriter.java:22)
>        HadoopWriterLib.HadoopWriter.<init>(HadoopWriter.java:16)
>        HadoopServletTest.doGet(HadoopServletTest.java:35)
>        javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
>        javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
>
> *note* *The full stack trace of the root cause is available in the Apache
> Tomcat/7.0.6 logs.*
>
> The error can be a problem on my ubuntu server ?
>
> thanks
>
> On Mon, Jan 24, 2011 at 1:01 PM, Alessandro Binhara <binhara@gmail.com
> >wrote:
>
> > ..i try
> >  java -classpath hadoop-core-0.20.1.jar -jar HahoopHdfsHello.jar
> >
> > i got a same error..
> > i will try build a servlet and run on tomcat...
> > i try many issues to config a classpath... all fail..
> >
> > thanks
> >
> >
> > On Mon, Jan 24, 2011 at 12:54 PM, Harsh J <qw...@gmail.com>
> wrote:
> >
> >> The issue would definitely lie with your CLASSPATH.
> >>
> >> Ideally, while beginning development using Hadoop 0.20, it is better
> >> to use the `hadoop jar` command to launch jars of any kind that
> >> require Hadoop libraries; be it MapReduce or not. The command will
> >> ensure that all the classpath requirements for Hadoop-side libraries
> >> are satisfied, so you don't have to worry.
> >>
> >> Anyhow, try launching it this way:
> >> $ java -classpath hadoop-0.20.2-core.jar -jar HadoopHdfsHello.jar; #
> >> This should run just fine.
> >>
> >> On Mon, Jan 24, 2011 at 5:06 PM, Alessandro Binhara <bi...@gmail.com>
> >> wrote:
> >> > Hello ..
> >> >
> >> > i solve problem in jar..
> >> > i put a hadoop-core-0.20.2.jar   in same jar dir.
> >> >
> >> > i configure a class path
> >> > export CLASSPATH=.:$JAVA_HOME
> >> >
> >> > i got this erro in shell
> >> >
> >> > root:~# java -jar HahoopHdfsHello.jar
> >> > Exception in thread "main" java.lang.NoClassDefFoundError:
> >> > org/apache/hadoop/conf/Configuration
> >> >        at HadooHdfsHello.main(HadooHdfsHello.java:18)
> >> > Caused by: java.lang.ClassNotFoundException:
> >> > org.apache.hadoop.conf.Configuration
> >> >        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
> >> >        at java.security.AccessController.doPrivileged(Native Method)
> >> >        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
> >> >        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
> >> >        at
> sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
> >> >        at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
> >> >        ... 1 more
> >> >
> >> >
> >> > What is the problem?
> >> >
> >> > thanks
> >> >
> >>
> >>
> >>
> >> --
> >> Harsh J
> >> www.harshj.com
> >>
> >
> >
>