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POJar works with standalone Hadoop, but not on the actual cluster (java.lang.ClassNotFoundException: org.jfree.data.xy.XYDataset)
 

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  1. POJar works with standalone Hadoop, but not on the actual cluster (java.lang.ClassNotFoundException: org.jfree.data.xy.XYDataset)
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    <p>I am trying to build my project using Eclipse on Windows and execute on a Linux cluster. The project depends on some external jars, which I enclosed using eclipse's "Export->Runnable JAR -> Package required library into jar" build option. I checked the jar contains the classes within a folder structure, and the external jars are in the root folder.</p> <p>On Hadoop standalone, Cygwin and Linux, this works fine but on an actual Hadoop Linux cluster it fails, when it tries to access a class from the first external jar, throwing up a <code>ClassNotFoundException</code>.</p> <p>Is there a way to force Hadoop to search the jar, I thought this would work.</p> <pre><code>10/07/16 11:44:59 INFO mapred.JobClient: Task Id : attempt_201007161003_0005_m_000001_0, Status : FAILED Error: java.lang.ClassNotFoundException: org.jfree.data.xy.XYDataset 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) at org.akintayo.analysis.ecg.preprocess.ReadPlotECG.plotECG(ReadPlotECG.java:27) at org.akintayo.analysis.ecg.preprocess.BuildECGImages.writeECGImages(BuildECGImages.java:216) at org.akintayo.analysis.ecg.preprocess.BuildECGImages.converSingleECGToImage(BuildECGImages.java:305) at org.akintayo.analysis.ecg.preprocess.BuildECGImages.main(BuildECGImages.java:457) at org.akintayo.hadoop.HadoopECGPreprocessByFile$MapTest.map(HadoopECGPreprocessByFile.java:208) at org.akintayo.hadoop.HadoopECGPreprocessByFile$MapTest.map(HadoopECGPreprocessByFile.java:1) at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50) at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307) at org.apache.hadoop.mapred.Child.main(Child.java:170) </code></pre>
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