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https://issues.apache.org/jira/browse/MAHOUT-447?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12891885#action_12891885
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Drew Farris commented on MAHOUT-447:
------------------------------------
Could you update to the latest version on trunk and give it another try? I
fixed a few issues related to classloading in MAHOUT-427 that could potentially
be related although I'm somewhat doubtful.
If that still fails, what version of hadoop are you running? Perhaps you could
share how were the clusters and points files created, was the same version of
mahout used? Is the data small enough to upload somewhere?
If it is any help, org.apache.mahout.math.PersistentObject can be found in
mahout-collections-1.0.jar -- this should be present in
mahout-examples-0.4-SNAPSHOT.job
> ClassNotFound exception when running mahout
> -------------------------------------------
>
> Key: MAHOUT-447
> URL: https://issues.apache.org/jira/browse/MAHOUT-447
> Project: Mahout
> Issue Type: Bug
> Components: Math
> Affects Versions: 0.4
> Reporter: Randy Prager
> Priority: Critical
>
> We built 0.4-SNAPSHOT from source
> When running {{$MAHOUT_HOME/bin/mahout}} we get the following exception (and
> we can't find the class in the source tree)
> {noformat}
> java.lang.NoClassDefFoundError: org/apache/mahout/math/PersistentObject
> at java.lang.ClassLoader.defineClass1(Native Method)
> at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
> 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$1.run(URLClassLoader.java:195)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
> at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
> at java.lang.ClassLoader.defineClass1(Native Method)
> at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
> 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$1.run(URLClassLoader.java:195)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
> at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
> at java.lang.ClassLoader.defineClass1(Native Method)
> at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
> 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$1.run(URLClassLoader.java:195)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
> at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:169)
> at
> org.apache.mahout.driver.MahoutDriver.addClass(MahoutDriver.java:206)
> at org.apache.mahout.driver.MahoutDriver.main(MahoutDriver.java:108)
> Caused by: java.lang.ClassNotFoundException:
> org.apache.mahout.math.PersistentObject
> at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
> at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
> ... 40 more
> {noformat}
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