Hadoop is not a java runtime environment it runs special map/reduce applications. Go search for "how to write a hadoop program" and there will be lots of examples or you can pick up a book on Hadoop and that can help you with some examples too.
--Bobby From: R J <[email protected]<mailto:[email protected]>> Reply-To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>>, R J <[email protected]<mailto:[email protected]>> Date: Wednesday, November 14, 2012 3:00 PM To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Subject: Hadoop Java compilation error Hi All, I installed Hadoop 1.0.4 on Cygwin and tried to run Java HelloWorld but I get exception error: $ bin/hadoop javac HelloWorld.java java.lang.NoClassDefFoundError: javac Exception in thread "main" $ echo $JAVA_HOME /cygdrive/c/java $ javac HelloWorld.java $ java HelloWorld Hello, World I have set JAVA_HOME environment variable in hadoop-env.sh . How do I make it work on hadoop? Thank you.
