Thanks, I think GORA-172 (https://issues.apache.org/jira/browse/GORA-172) describes this problem.
The patch looks good but we need a way to repro this. How did you reproduce the bug? - Henry On Thu, Nov 4, 2010 at 5:27 AM, yumeng <[email protected]> wrote: > Hi all: > I have run some test in Gora-core, but I get some exceptions as belows: > > 10/11/04 20:19:15 WARN mapred.JobClient: No job jar file set. User > classes may not be found. See JobConf(Class) or > JobConf#setJar(String). > Exception in thread "main" java.lang.RuntimeException: > java.io.IOException: java.lang.ClassNotFoundException: > org.apache.gora.memory.store.MemStore.MemQuery > at > org.apache.gora.mapreduce.GoraInputFormat.setConf(GoraInputFormat.java:109) > at > org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:62) > at > org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117) > at > org.apache.hadoop.mapred.JobClient.writeNewSplits(JobClient.java:882) > at > org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:779) > at org.apache.hadoop.mapreduce.Job.submit(Job.java:432) > at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:447) > at > org.apache.gora.examples.mapreduce.WordCount.wordCount(WordCount.java:142) > at > org.apache.gora.examples.mapreduce.WordCount.run(WordCount.java:166) > at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65) > at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79) > at > org.apache.gora.examples.mapreduce.WordCount.main(WordCount.java:175) > Caused by: java.io.IOException: java.lang.ClassNotFoundException: > org.apache.gora.memory.store.MemStore.MemQuery > at org.apache.gora.util.IOUtils.loadFromConf(IOUtils.java:485) > at > org.apache.gora.mapreduce.GoraInputFormat.getQuery(GoraInputFormat.java:119) > at > org.apache.gora.mapreduce.GoraInputFormat.setConf(GoraInputFormat.java:106) > ... 11 more > Caused by: java.lang.ClassNotFoundException: > org.apache.gora.memory.store.MemStore.MemQuery > at java.net.URLClassLoader$1.run(Unknown Source) > at java.security.AccessController.doPrivileged(Native Method) > at java.net.URLClassLoader.findClass(Unknown Source) > at java.lang.ClassLoader.loadClass(Unknown Source) > at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) > at java.lang.ClassLoader.loadClass(Unknown Source) > at java.lang.Class.forName0(Native Method) > at java.lang.Class.forName(Unknown Source) > at org.apache.gora.util.IOUtils.loadFromConf(IOUtils.java:482) > ... 13 more > > ================================ > Obviously, Class.forName() can't find the Class: > org.apache.gora.memory.store.MemStore.MemQuery. In fact, MemQuery > is a static inner Class in MemStore. Its name should be > "org.apache.gora.memory.store.MemStore$MemQuery" , but not > "org.apache.gora.memory.store.MemStore.MemQuery". > > When we invoke Class.forName(), we can get the result as > "org.apache.gora.memory.store.MemStore$MemQuery",while > Class.getCanonicalName() only return > "org.apache.gora.memory.store.MemStore.MemQuery". Class.forName() > can only recognize the the result of Class.getName(). Do you will > change the code from getCanonicalName() to getName() in > org.apache.gora.util.IOUtils.java??? There are two places where > getCanonicalName() is used. > > After I change all getCanonicalName() to getName() in > org.apache.gora.util.IOUtils.java, everything looks OK! > > My JDK is 1.6.22. > Both in windows and in ubuntu, there exists this problem. >
