I've spent a considerable amount of time on the internet trying to find a fix but have had no luck whatsoever so any help would be greatly appreciated.   Basically I'm trying to perform simple tasks with the HBase API in the Cloudera Quickstart VM's Eclipse editor. I'm able to access HBase through the shell without issue, but whenever I try to run a Java program in Eclipse that utilizes the HBase API I'll receive numerous errors with ClassNotFound exceptions. Below is an example of a simple Java program that writes some data to a an existing HBase table, and further below that are some errors that popped up.   I'm included literally all of the /usr/lib/hbase jar files into the project buildpath and I get no visible errors, it's only when I run the program the errrors show up.   Java code below       package _project_267; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.text.ParseException; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.HBaseConfiguration; import org.apache.hadoop.hbase.client.HBaseAdmin; import org.apache.hadoop.hbase.client.HTable; import org.apache.hadoop.hbase.client.Put; import org.apache.hadoop.hbase.util.Bytes; public class test { public static void main(String[] args) throws UnsupportedEncodingException, IOException, ParseException { // TODO Auto-generated method stub Configuration config = HBaseConfiguration.create(); HTable hTable = new HTable(config, "person"); // instantiate Put class Put p = new Put(Bytes.toBytes("test")); // add values using add() method p.add(Bytes.toBytes("personal"), Bytes.toBytes("name"),Bytes.toBytes("Vivek")); p.add(Bytes.toBytes("personal"), Bytes.toBytes("age"),Bytes.toBytes("17")); // save the put Instance to the HTable. hTable.put(p); System.out.println("data inserted successfully"); // close HTable instance hTable.close(); } }         Runtime errors below       20/05/12 18:52:43 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". SLF4J: Defaulting to no-operation (NOP) logger implementation SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details. 20/05/12 18:52:44 INFO zookeeper.RecoverableZooKeeper: Process identifier=hconnection-0x4553dc23 connecting to ZooKeeper ensemble=localhost:2181 Exception in thread "main" java.io.IOException: java.lang.reflect.InvocationTargetException at org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:240) at org.apache.hadoop.hbase.client.ConnectionManager.createConnection(ConnectionManager.java:433) at org.apache.hadoop.hbase.client.ConnectionManager.createConnection(ConnectionManager.java:426) at org.apache.hadoop.hbase.client.ConnectionManager.getConnectionInternal(ConnectionManager.java:304) at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:186) at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:152) at _project_267.test.main(test.java:21) Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:526) at org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:238) ... 6 more Caused by: java.lang.NoClassDefFoundError: io/netty/channel/EventLoopGroup at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:270) at org.apache.hadoop.conf.Configuration.getClassByNameOrNull(Configuration.java:2288) at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:2253) at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2347) at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2373) at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.<init>(ConnectionManager.java:667) ... 11 more Caused by: java.lang.ClassNotFoundException: io.netty.channel.EventLoopGroup 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) ... 18 more       ... View more