if u r tomcat is on remote linux  make sure u give path names of u r hadoop
jars at common.loader=  in catalina.properties file,
also make sure all hadoop jars are present in web-inf/lib    folder of u r
webapps inside u r project folder structure also make sure that u have jars
of the same version of hadoop tht u have installed or using....

On Fri, Nov 23, 2012 at 4:24 PM, praveenesh kumar <[EMAIL PROTECTED]>wrote:

> Hello users,
>
> I am trying to create a Hadoop WAR file, which will be deployed on Tomcat.
> My code as a JAR is running perfectly fine. But when I am deploying as WAR
> on tomcat, I am getting the following issue. From the logs, its saying
> couldn't find my Map and Reduce class, but I already made a JAR of my code
> and put it inside WEB-INF/lib folder. All hadoop jars also present at
> WEB-INF/lib folder. Can someone let me know what could be the issue :
>
> java.lang.RuntimeException: Error in configuring object
>
>                at
> org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:93)
>
>                at
> org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:64)
>
>                at
> org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117)
>
>                at
> org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:387)
>
>                at org.apache.hadoop.mapred.MapTask.run(MapTask.java:325)
>
>                at org.apache.hadoop.mapred.Child$4.run(Child.java:270)
>
>                at java.security.AccessController.doPrivileged(Native
> Method)
>
>                at javax.security.auth.Subject.doAs(Subject.java:396)
>
>                at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1157)
>
>                at org.apache.hadoop.mapred.Child.main(Child.java:264)
>
> Caused by: java.lang.reflect.InvocationTargetException
>
>                at sun.reflect.NativeMethodAccessorImpl.invoke0(Native
> Method)
>
>                at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>
>                at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>
>                at java.lang.reflect.Method.invoke(Method.java:597)
>
>                at
> org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:88)
>
>                ... 9 more
>
> Caused by: java.lang.RuntimeException: java.lang.RuntimeException:
> java.lang.ClassNotFoundException: com.ta.wh.Map
>
>                at
> org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1028)
>
>                at
> org.apache.hadoop.mapred.JobConf.getMapperClass(JobConf.java:968)
>
>                at
> org.apache.hadoop.mapred.MapRunner.configure(MapRunner.java:34)
>
>                ... 14 more
>
> Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException:
> com.ta.wh.Map
>
>                at
> org.apache.hadoop.conf.Configuration.getClass(Configuration.java:996)
>
>                at
> org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1020)
>
>                ... 16 more
>
> Caused by: java.lang.ClassNotFoundException: com.ta.wh.Map
>
>                at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
>
>                at java.security.AccessController.doPrivileged(Native
> Method)
>
>                at
> java.net.URLClassLoader.findClass(URLClassLoader.java:190)
>
>                at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
>
>                at
> sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
>
>                at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
>
>                at java.lang.Class.forName0(Native Method)
>
>                at java.lang.Class.forName(Class.java:247)
>
>                at
> org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:943)
>
>                at
> org.apache.hadoop.conf.Configuration.getClass(Configuration.java:994)
>
>                ... 17 more