title: java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient
body: <p>I have Hadoop 2.7.1 and apache-hive-1.2.1 versions installed on ubuntu 14.0. </p>
  
  <ol>
  <li>Why this error is occurring ?</li>
  <li>Is any metastore installation required?</li>
  <li>When we typing hive command on terminal how the xml's internally called, what is the flow of those xml's?</li>
  <li>Any other configuration's required?</li>
  </ol>
  
  <p>When I am writing the hive command on ubuntu 14.0 terminal it is throwing the below exception.</p>
  
  <pre><code> $ hive
  
      Logging initialized using configuration in jar:file:/usr/local/hive/apache-hive-1.2.1-bin/lib/hive-common-1.2.1.jar!/hive-log4j.properties
      Exception in thread "main" java.lang.RuntimeException: java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient
          at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:522)
          at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:677)
          at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:621)
          at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
          at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
          at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
          at java.lang.reflect.Method.invoke(Method.java:520)
          at org.apache.hadoop.util.RunJar.run(RunJar.java:221)
          at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
      Caused by: java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient
          at org.apache.hadoop.hive.metastore.MetaStoreUtils.newInstance(MetaStoreUtils.java:1523)
          at org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.&lt;init&gt;(RetryingMetaStoreClient.java:86)
          at org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.getProxy(RetryingMetaStoreClient.java:132)
          at org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.getProxy(RetryingMetaStoreClient.java:104)
          at org.apache.hadoop.hive.ql.metadata.Hive.createMetaStoreClient(Hive.java:3005)
          at org.apache.hadoop.hive.ql.metadata.Hive.getMSC(Hive.java:3024)
          at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:503)
          ... 8 more
      Caused by: java.lang.reflect.InvocationTargetException
          at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
          at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
          at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
          at java.lang.reflect.Constructor.newInstance(Constructor.java:426)
          at org.apache.hadoop.hive.metastore.MetaStoreUtils.newInstance(MetaStoreUtils.java:1521)
          ... 14 more
      Caused by: javax.jdo.JDOFatalInternalException: Error creating transactional connection factory
      NestedThrowables:
      java.lang.reflect.InvocationTargetException
          at org.datanucleus.api.jdo.NucleusJDOHelper.getJDOExceptionForNucleusException(NucleusJDOHelper.java:587)
          at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.freezeConfiguration(JDOPersistenceManagerFactory.java:788)
          at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.createPersistenceManagerFactory(JDOPersistenceManagerFactory.java:333)
          at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.getPersistenceManagerFactory(JDOPersistenceManagerFactory.java:202)
          at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
          at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
          at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
          at java.lang.reflect.Method.invoke(Method.java:520)
          at javax.jdo.JDOHelper$16.run(JDOHelper.java:1965)
          at java.security.AccessController.doPrivileged(Native Method)
          at javax.jdo.JDOHelper.invoke(JDOHelper.java:1960)
          at javax.jdo.JDOHelper.invokeGetPersistenceManagerFactoryOnImplementation(JDOHelper.java:1166)
          at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:808)
          at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:701)
          at org.apache.hadoop.hive.metastore.ObjectStore.getPMF(ObjectStore.java:365)
          at org.apache.hadoop.hive.metastore.ObjectStore.getPersistenceManager(ObjectStore.java:394)
          at org.apache.hadoop.hive.metastore.ObjectStore.initialize(ObjectStore.java:291)
          at org.apache.hadoop.hive.metastore.ObjectStore.setConf(ObjectStore.java:258)
          at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:76)
          at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:136)
          at org.apache.hadoop.hive.metastore.RawStoreProxy.&lt;init&gt;(RawStoreProxy.java:57)
          at org.apache.hadoop.hive.metastore.RawStoreProxy.getProxy(RawStoreProxy.java:66)
          at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.newRawStore(HiveMetaStore.java:593)
          at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.getMS(HiveMetaStore.java:571)
          at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.createDefaultDB(HiveMetaStore.java:624)
          at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.init(HiveMetaStore.java:461)
          at org.apache.hadoop.hive.metastore.RetryingHMSHandler.&lt;init&gt;(RetryingHMSHandler.java:66)
          at org.apache.hadoop.hive.metastore.RetryingHMSHandler.getProxy(RetryingHMSHandler.java:72)
          at org.apache.hadoop.hive.metastore.HiveMetaStore.newRetryingHMSHandler(HiveMetaStore.java:5762)
          at org.apache.hadoop.hive.metastore.HiveMetaStoreClient.&lt;init&gt;(HiveMetaStoreClient.java:199)
          at org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient.&lt;init&gt;(SessionHiveMetaStoreClient.java:74)
          ... 19 more
      Caused by: java.lang.reflect.InvocationTargetException
          at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
          at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
          at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
          at java.lang.reflect.Constructor.newInstance(Constructor.java:426)
          at org.datanucleus.plugin.NonManagedPluginRegistry.createExecutableExtension(NonManagedPluginRegistry.java:631)
          at org.datanucleus.plugin.PluginManager.createExecutableExtension(PluginManager.java:325)
          at org.datanucleus.store.AbstractStoreManager.registerConnectionFactory(AbstractStoreManager.java:282)
          at org.datanucleus.store.AbstractStoreManager.&lt;init&gt;(AbstractStoreManager.java:240)
          at org.datanucleus.store.rdbms.RDBMSStoreManager.&lt;init&gt;(RDBMSStoreManager.java:286)
          at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
          at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
          at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
          at java.lang.reflect.Constructor.newInstance(Constructor.java:426)
          at org.datanucleus.plugin.NonManagedPluginRegistry.createExecutableExtension(NonManagedPluginRegistry.java:631)
          at org.datanucleus.plugin.PluginManager.createExecutableExtension(PluginManager.java:301)
          at org.datanucleus.NucleusContext.createStoreManagerForProperties(NucleusContext.java:1187)
          at org.datanucleus.NucleusContext.initialise(NucleusContext.java:356)
          at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.freezeConfiguration(JDOPersistenceManagerFactory.java:775)
          ... 48 more
      Caused by: org.datanucleus.exceptions.NucleusException: Attempt to invoke the "BONECP" plugin to create a ConnectionPool gave an error : The specified datastore driver ("com.mysql.jdbc.Driver") was not found in the CLASSPATH. Please check your CLASSPATH specification, and the name of the driver.
          at org.datanucleus.store.rdbms.ConnectionFactoryImpl.generateDataSources(ConnectionFactoryImpl.java:259)
          at org.datanucleus.store.rdbms.ConnectionFactoryImpl.initialiseDataSources(ConnectionFactoryImpl.java:131)
          at org.datanucleus.store.rdbms.ConnectionFactoryImpl.&lt;init&gt;(ConnectionFactoryImpl.java:85)
          ... 66 more
      Caused by: org.datanucleus.store.rdbms.connectionpool.DatastoreDriverNotFoundException: The specified datastore driver ("com.mysql.jdbc.Driver") was not found in the CLASSPATH. Please check your CLASSPATH specification, and the name of the driver.
          at org.datanucleus.store.rdbms.connectionpool.AbstractConnectionPoolFactory.loadDriver(AbstractConnectionPoolFactory.java:58)
          at org.datanucleus.store.rdbms.connectionpool.BoneCPConnectionPoolFactory.createConnectionPool(BoneCPConnectionPoolFactory.java:54)
          at org.datanucleus.store.rdbms.ConnectionFactoryImpl.generateDataSources(ConnectionFactoryImpl.java:238)
          ... 68 more
  </code></pre>
  
  <p>To avoid above error I created hive-site.xml with :</p>
  
  <pre><code> &lt;configuration&gt;
  
        &lt;property&gt;
          &lt;name&gt;hive.metastore.warehouse.dir&lt;/name&gt;
          &lt;value&gt;/home/local/hive-metastore-dir/warehouse&lt;/value&gt;
  
        &lt;/property&gt;
  
      &lt;property&gt;
        &lt;name&gt;javax.jdo.option.ConnectionURL&lt;/name&gt;
        &lt;value&gt;jdbc:mysql://localhost:3306/hivedb?createDatabaseIfNotExist=true&lt;/value&gt;
      &lt;/property&gt;
      &lt;property&gt;
        &lt;name&gt;javax.jdo.option.ConnectionDriverName&lt;/name&gt;
        &lt;value&gt;com.mysql.jdbc.Driver&lt;/value&gt;
      &lt;/property&gt;
      &lt;property&gt;
        &lt;name&gt;javax.jdo.option.ConnectionUserName&lt;/name&gt;
        &lt;value&gt;user&lt;/value&gt;
      &lt;/property&gt;
      &lt;property&gt;
        &lt;name&gt;javax.jdo.option.ConnectionPassword&lt;/name&gt;
        &lt;value&gt;password&lt;/value&gt;
      &lt;/property&gt;
  
      &lt;configuration&gt;
  </code></pre>
  
  <p>Also provided the environment variables in <code>~/.bashrc file</code>; Still the error persist</p>
  
  <pre><code>#HIVE home directory configuration
  export HIVE_HOME=/usr/local/hive/apache-hive-1.2.1-bin
  export PATH="$PATH:$HIVE_HOME/bin"
  </code></pre>