以下のエラーが出たら、「hadoop-hdfs-2.3.0-cdh5.0.2.jar」をクラスパスに通してください。
（バージョンは適宜修正）
14/06/30 18:57:11 WARN util.DynamicClassLoader: Failed to identify the fs of dir hdfs://127.0.0.1:9003/hbase/lib, ignored
java.io.IOException: No FileSystem for scheme: hdfs
at org.apache.hadoop.fs.FileSystem.getFileSystemClass(FileSystem.java:2385)
at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2392)
at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:89)
at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2431)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2413)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:368)
at org.apache.hadoop.fs.Path.getFileSystem(Path.java:296)
at org.apache.hadoop.hbase.util.DynamicClassLoader.(DynamicClassLoader.java:104)
at org.apache.hadoop.hbase.protobuf.ProtobufUtil.(ProtobufUtil.java:197)
at org.apache.hadoop.hbase.ClusterId.parseFrom(ClusterId.java:64)
at org.apache.hadoop.hbase.zookeeper.ZKClusterId.readClusterIdZNode(ZKClusterId.java:69)
at org.apache.hadoop.hbase.client.ZooKeeperRegistry.getClusterId(ZooKeeperRegistry.java:83)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.retrieveClusterId(HConnectionManager.java:801)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.(HConnectionManager.java:633)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.apache.hadoop.hbase.client.HConnectionManager.createConnection(HConnectionManager.java:387)
at org.apache.hadoop.hbase.client.HConnectionManager.createConnection(HConnectionManager.java:366)
at org.apache.hadoop.hbase.client.HConnectionManager.getConnection(HConnectionManager.java:247)
at org.apache.hadoop.hbase.client.HTable.(HTable.java:188)
at org.apache.hadoop.hbase.client.HTable.(HTable.java:165)
at org.apache.hadoop.hbase.client.HTableFactory.createHTableInterface(HTableFactory.java:39)
NoClassDefFoundErrorやNoClassExceptionなどが出ないので、原因がわかりづらいです。