Hi, can you show the output of "%> jar tf WordCount.jar". I'm
wondering whether you've jarred it nested in any package folders that
need to be written on the command line eg.
bin/hadoop jar WordCount.jar WordCount
org/apache/hadoop/examples/WordCount dir dir
Quoting C G <[EMAIL PROTECTED]>:
I've deployed hadoop-0.13.0 and successfully run some examples. Now
I am trying to compile and run the examples prior to starting to
develop my own code. I've managed to do little more than get a nice
spew of error messages. This is no doubt due to my own ignorance
and too much Python programming, but can anybody tell me how to
compile the examples (WordCount.java for example) and run them?
I apologize for the basic question, which I am sure is
classpath-magic related. Any assistance most appreciated. I
promise to be helpful to other newbs like myself going forward.
I've tried a bunch of stuff, but it all comes down to various
"can't find class X' errors. This is representative of as far as
I've gotten:
% java -version
java version "1.6.0_02"
Java(TM) SE Runtime Environment (build 1.6.0_02-b05)
Java HotSpot(TM) Client VM (build 1.6.0_02-b05, mixed mode, sharing
% cd ${HADOOP_HOME}/hadoop-0.13.0/src/examples/org/apache/hadoop/examples
% javac -classpath
${HADOOP_HOME}/hadoop-0.13.0/hadoop-0.13.0-core.jar WordCount.java
% jar -cvf WordCount.jar *.class
% cp *.jar ${HADOOP_HOME/hadoop-0.13.0/
% cd ${HADOOP_HOME/hadoop-0.13.0/
% bin/hadoop jar WordCount.jar WordCount input_files/text.txt
output_files/results2.txt
Exception in thread "main" java.lang.NoClassDefFoundError: WordCount
(wrong name: org/apache/hadoop/examples/WordCount)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at org.apache.hadoop.util.RunJar.main(RunJar.java:148)
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