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From "Colin P. McCabe" <cmcc...@apache.org>
Subject Re: Java exception
Date Thu, 08 Oct 2015 19:01:31 GMT
Hi Odin,

org/htrace/Trace is a class from the pre-Apache version of HTrace.  It
sounds like the HTrace jar you need is not 3.1.0-incubating, but
perhaps 3.0.4 (or even some older version)?

Try finding the source code for the version of Hadoop you are using
and running "mvn dependency:tree"

best,
Colin

On Thu, Oct 8, 2015 at 10:32 AM, Odin Guillermo Caudillo Gallegos
<odin.guillermo@gmail.com> wrote:
> Hi, i'm building a code to write files on hdfs, but it gives me the
> following error:
>
> Exception in thread "main" java.lang.NoClassDefFoundError: org/htrace/Trace
> at org.apache.hadoop.hdfs.DFSOutputStream.<init>(DFSOutputStream.java:1703)
> at
> org.apache.hadoop.hdfs.DFSOutputStream.newStreamForCreate(DFSOutputStream.java:1756)
> at org.apache.hadoop.hdfs.DFSClient.create(DFSClient.java:1668)
> at org.apache.hadoop.hdfs.DFSClient.create(DFSClient.java:1593)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$6.doCall(DistributedFileSystem.java:397)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$6.doCall(DistributedFileSystem.java:393)
> at
> org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:393)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:337)
> at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:909)
> at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:802)
> at test.HDFSMain.main(HDFSMain.java:23)
> Caused by: java.lang.ClassNotFoundException: org.htrace.Trace
> 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)
> ... 12 more
>
> I already have the htrace-core-3.1.0-incubating.jar in my external jars,
> but it appears that isnt't looking for the apache one but a different
> version.
> I had included all the jars in the hadoop library folder but no success.
> Thanks

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