Rob, Like Kushal says, it's about HADOOP_CLASSPATH. Since you say you have tried setting HADOOP_CLASSPATH, make sure HADOOP_CLASSPATH is not overwritten somewhere else like in your hadoop-env.sh (under $HADOOP_HOME/conf). Nezih From: GraphBuilder [mailto:graphbuilder-bounces@lists.01.org] On Behalf Of Datta, Kushal Sent: Monday, January 20, 2014 1:54 PM To: GraphBuilder Users List Subject: Re: [GraphBuilder] ClassNotFound error trying to run rdf_example.pig Hi Rob, Please extend HADOOP_CLASSPATH with the path to the graphbuilder jar before you use the library. $ export HADOOP_CLASSPATH=$HADOOP_CLASSPATH:/path_to_your_graphbuilder_jar Thanks, -Kushal. From: GraphBuilder [mailto:graphbuilder-bounces@lists.01.org] On Behalf Of Rob Vesse Sent: Monday, January 20, 2014 1:52 PM To: GraphBuilder Users List Subject: [GraphBuilder] ClassNotFound error trying to run rdf_example.pig I'm trying to run the examples with the 2.0 alpha build and I'm getting the following error: 2014-01-20 13:42:13,101 [Thread-6] WARN org.apache.hadoop.mapred.LocalJobRunner - job_local_0001 java.io.IOException: Could not find class com.intel.hadoop.graphbuilder.graphelements.SerializedGraphElementStringTypeVids, while attempting to de-serialize it at org.apache.pig.data.BinInterSedes.readWritable(BinInterSedes.java:293) at org.apache.pig.data.BinInterSedes.readDatum(BinInterSedes.java:422) at org.apache.pig.data.BinInterSedes.readDatum(BinInterSedes.java:318) at org.apache.pig.data.utils.SedesHelper.readGenericTuple(SedesHelper.java:144) at org.apache.pig.data.BinInterSedes.readTuple(BinInterSedes.java:149) at org.apache.pig.data.BinInterSedes.readTuple(BinInterSedes.java:1374) at org.apache.pig.impl.io.NullableTuple.readFields(NullableTuple.java:55) at org.apache.hadoop.io.serializer.WritableSerialization$WritableDeserializer.deserialize(WritableSerialization.java:67) at org.apache.hadoop.io.serializer.WritableSerialization$WritableDeserializer.deserialize(WritableSerialization.java:40) at org.apache.hadoop.mapreduce.ReduceContext.nextKeyValue(ReduceContext.java:116) at org.apache.hadoop.mapreduce.ReduceContext.nextKey(ReduceContext.java:92) at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:175) at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:649) at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:417) at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:260) Caused by: java.lang.ClassNotFoundException: com.intel.hadoop.graphbuilder.graphelements.SerializedGraphElementStringTypeVids at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:190) at org.apache.pig.data.BinInterSedes.readWritable(BinInterSedes.java:291) This is when running in local mode using the following command: Note that I have double checked that the graph builder 2.0 with dependencies JAR is in the class path (I've tried both with CLASSPATH and HADOOP_CLASSPATH) Anyone else run into this error or have any thoughts on the cause? Rob Rob Vesse Software Engineer Mobile +44 (0) 7791 638 873 | rvesse@yarcdata.com<mailto:rvesse@yarcdata.com> | Skype rvesse One Kingdom Street | London | W2 6BD | www.yarcdata.com<http://www.yarcdata.com/> [Description: cid:image002.jpg@01CE3B8C.715B1D60]<http://www.yarcdata.com/>