Hello,
Thanks for the tip. I have added all the jar files in HBASE_HOME and
HBASE_HOME/lib and HBASE_HOME/conf is in the classpath.
Going through the code of Configuration.java and
HBaseConfiguration.java, the latter is a simple subclass and
setClassLoader replaces the classloader with a user supplied one. This
classloader is then used to things like Class.forName(...)
I didn't understand the bit about recursive class loaders, there being
only one right?
Thanks again for the information
Cheers
Saptarshi
On Thu, Jul 9, 2009 at 2:23 PM, Ryan Rawson<ryano...@gmail.com> wrote:
> You need to include everything in lib/*.jar. this includes the hadoop jar...
>
> The problem might be that rcl isn't registering itself so the recursive
> class loaders aren't using rcl?
>
> On Jul 9, 2009 2:15 PM, "Saptarshi Guha" <saptarshi.g...@gmail.com> wrote:
>
> Hello,
> I'm using HBase(trying to) from another language (R) which has it's
> own classloader (call it RCL)
> RCL takes its own classpath (in which i've included all Hbase JARS and
> conf folder) and
> did the following
>
> cfg <- .jnew("org/apache/hadoop/hbase/HBaseConfiguration") ## Create
> a new Java object
> .jcall(cfg,"V","setClassLoader",.jcast(.jclassLoader(),"java/lang/ClassLoader"))
> ##Call setClassLoader on cfg, replacing it with RCL
> .jcall("org/apache/hadoop/hbase/client/HBaseAdmin","V","checkHBaseAvailable",cfg)
> ## call the static method checkHBaseAvailable
> .jcheck() ## check for exceptions
> Exception in thread "main" java.lang.RuntimeException: Socket Factory
> class not found: java.lang.ClassNotFoundException:
> org.apache.hadoop.net.StandardSocketFactory
> at
> org.apache.hadoop.net.NetUtils.getSocketFactoryFromProperty(NetUtils.java:111)
> at
> org.apache.hadoop.net.NetUtils.getDefaultSocketFactory(NetUtils.java:91)
>
> So it appears the classloader can't find it. But it can,
> .jnew("org/apache/hadoop/net/StandardSocketFactory") returns a Java
> Object corresponding to this class.
>
> The configuration's class loader is in fact replaced yet for some
> reason this class cannot be found.
> This is the code in NetUtils
> public static SocketFactory getSocketFactoryFromProperty(
> Configuration conf, String propValue) {
>
> try {
> Class<?> theClass = conf.getClassByName(propValue);
> return (SocketFactory) ReflectionUtils.newInstance(theClass, conf);
>
> } catch (ClassNotFoundException cnfe) {
> throw new RuntimeException("Socket Factory class not found: " + cnfe);
> }
>
> I see no reason why this is throwing the exception when clearly the
> class is present.
> Any help would be appreciated
> Regards
> Saptarsho
>
