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 <[email protected]>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 <[email protected]> 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 <[email protected]>
>> 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
>>
>
>
