Hello all.. i found the problem . A Hadoop jar file from a hadoop website has a problem. I copy a jar file from a Cloudera distribuition and error desapear ..
If have a commiter from hadoop website.. please check the problem .. thanks On Tue, Jan 25, 2011 at 9:27 AM, Alessandro Binhara <[email protected]>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 <[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 >>> >> >> >
