Hi all,

I am getting the below error when trying to create a new HTable object (see
end of email)...

I believe the error is occuring in the below function because the
getClassLoader() function is returning null. Because the way my application
is set up, I have to add all hbase, hadoop, and zookeeper-related jars to
the bootstrap classpath using the java "-Xbootclasspath/p" flag. I think
this is causing some kind of issue with the classloader. Any one have any
ideas what I can do to resolve this?

public static Properties makeZKProps(Configuration conf) {
    // First check if there is a zoo.cfg in the CLASSPATH. If so, simply
read
    // it and grab its configuration properties.
*    ClassLoader cl = HQuorumPeer.class.getClassLoader();*
*    final InputStream inputStream cl.getResourceAsStream(HConstants.ZOOKEEPER_CONFIG_NAME);*
    if (inputStream != null) {
      try {
        return parseZooCfg(conf, inputStream);
      } catch (IOException e) {
        LOG.warn("Cannot read " + HConstants.ZOOKEEPER_CONFIG_NAME +
                 ", loading from XML files", e);
      }
    }
Stacktrace:

11/08/14 19:18:43 java.lang.NullPointerException
at org.apache.hadoop.hbase.zookeeper.ZKConfig.makeZKProps(ZKConfig.java:65)
 at
org.apache.hadoop.hbase.zookeeper.ZKConfig.getZKQuorumServersString(ZKConfig.java:250)
at
org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.<init>(ZooKeeperWatcher.java:117)
 at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getZooKeeperWatcher(HConnectionManager.java:1255)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.setupZookeeperTrackers(HConnectionManager.java:515)
 at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.<init>(HConnectionManager.java:506)
at
org.apache.hadoop.hbase.client.HConnectionManager.getConnection(HConnectionManager.java:180)
 at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:180)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:158)

Sorry, I forgot to mention:

I'm using hadoop-0.20-append, hbase-0.92 on two red hat 5.5 machines.

The function I pasted is in org.apache.hadoop.hbase.zookeeper.ZKConfig.
On Aug 14, 2011, at 7:27 PM, Nichole Treadway wrote:

> Hi all,
>
> I am getting the below error when trying to create a new HTable object (see end of email)...
>
> I believe the error is occuring in the below function because the getClassLoader() function is returning null. Because the way my application is set up, I have to add all hbase, hadoop, and zookeeper-related jars to the bootstrap classpath using the java "-Xbootclasspath/p" flag. I think this is causing some kind of issue with the classloader. Any one have any ideas what I can do to resolve this?
>
> public static Properties makeZKProps(Configuration conf) {
>     // First check if there is a zoo.cfg in the CLASSPATH. If so, simply read
>     // it and grab its configuration properties.
>     ClassLoader cl = HQuorumPeer.class.getClassLoader();
>     final InputStream inputStream = cl.getResourceAsStream(HConstants.ZOOKEEPER_CONFIG_NAME);
>     if (inputStream != null) {
>       try {
>         return parseZooCfg(conf, inputStream);
>       } catch (IOException e) {
>         LOG.warn("Cannot read " + HConstants.ZOOKEEPER_CONFIG_NAME +
>                  ", loading from XML files", e);
>       }
>     }
>
>
> Stacktrace:
>
> 11/08/14 19:18:43 java.lang.NullPointerException
> at org.apache.hadoop.hbase.zookeeper.ZKConfig.makeZKProps(ZKConfig.java:65)
> at org.apache.hadoop.hbase.zookeeper.ZKConfig.getZKQuorumServersString(ZKConfig.java:250)
> at org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.<init>(ZooKeeperWatcher.java:117)
> at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getZooKeeperWatcher(HConnectionManager.java:1255)
> at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.setupZookeeperTrackers(HConnectionManager.java:515)
> at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.<init>(HConnectionManager.java:506)
> at org.apache.hadoop.hbase.client.HConnectionManager.getConnection(HConnectionManager.java:180)
> at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:180)
> at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:158)

The getClassLoader javadoc says:

This method will return null in such implementations if this class was
loaded by the bootstrap class loader.

So if I understand correctly, we need to add additional checks in that
method to guard HBase against people like you? :)

J-D

On Mon, Aug 15, 2011 at 5:47 AM, Nichole Treadway <[EMAIL PROTECTED]> wrote:
> Sorry, I forgot to mention:
>
> I'm using hadoop-0.20-append, hbase-0.92 on two red hat 5.5 machines.
>
> The function I pasted is in org.apache.hadoop.hbase.zookeeper.ZKConfig.
>
>
> On Aug 14, 2011, at 7:27 PM, Nichole Treadway wrote:
>
>> Hi all,
>>
>> I am getting the below error when trying to create a new HTable object (see end of email)...
>>
>> I believe the error is occuring in the below function because the getClassLoader() function is returning null. Because the way my application is set up, I have to add all hbase, hadoop, and zookeeper-related jars to the bootstrap classpath using the java "-Xbootclasspath/p" flag. I think this is causing some kind of issue with the classloader. Any one have any ideas what I can do to resolve this?
>>
>> public static Properties makeZKProps(Configuration conf) {
>>     // First check if there is a zoo.cfg in the CLASSPATH. If so, simply read
>>     // it and grab its configuration properties.
>>     ClassLoader cl = HQuorumPeer.class.getClassLoader();
>>     final InputStream inputStream = cl.getResourceAsStream(HConstants.ZOOKEEPER_CONFIG_NAME);
>>     if (inputStream != null) {
>>       try {
>>         return parseZooCfg(conf, inputStream);
>>       } catch (IOException e) {
>>         LOG.warn("Cannot read " + HConstants.ZOOKEEPER_CONFIG_NAME +
>>                  ", loading from XML files", e);
>>       }
>>     }
>>
>>
>> Stacktrace:
>>
>> 11/08/14 19:18:43 java.lang.NullPointerException
>>       at org.apache.hadoop.hbase.zookeeper.ZKConfig.makeZKProps(ZKConfig.java:65)
>>       at org.apache.hadoop.hbase.zookeeper.ZKConfig.getZKQuorumServersString(ZKConfig.java:250)
>>       at org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.<init>(ZooKeeperWatcher.java:117)
>>       at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getZooKeeperWatcher(HConnectionManager.java:1255)
>>       at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.setupZookeeperTrackers(HConnectionManager.java:515)
>>       at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.<init>(HConnectionManager.java:506)
>>       at org.apache.hadoop.hbase.client.HConnectionManager.getConnection(HConnectionManager.java:180)
>>       at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:180)
>>       at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:158)
>
>