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Subject: Re: Connecting from Tomcat to remote HBase
From: Vaibhav Puranik <vpuranik@gmail.com>
To: hbase-user@hadoop.apache.org
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--00504502eae09ae2330482bcbb98
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We have hbase in production with the  client running fine in tomcat.

Here is the POM we use for our hbse jar:

<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>org.apache</groupId>
  <artifactId>hbase</artifactId>
  <version>0.20.2</version>
  <description>HBase 0.20.2 Release</description>
  <dependencies>
    <dependency>
      <groupId>org.apache</groupId>
      <artifactId>zookeeper</artifactId>
      <version>3.2.1</version>
    </dependency>
    <dependency>
      <groupId>org.apache</groupId>
      <artifactId>hadoop</artifactId>
      <version>0.20.1-hdfs127-core</version>
    </dependency>
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.15</version>
    </dependency>
  </dependencies>
</project>


Regards,

Vaibhav Puranik

Gumgum


On Fri, Mar 26, 2010 at 4:28 PM, Karthik K <oss.akk@gmail.com> wrote:

> On Fri, Mar 26, 2010 at 9:54 AM, A Levine <levine.a@gmail.com> wrote:
>
> > Just to confirm, in the running webapp, the WEB-INF/lib/ directory
> > needs to contain:
> >
> > hbase-0.20.3.jar
> > zookeeper-3.2.2.jar
> > hadoop-0.20.2.jar
> > hbase-default.xml
> > hbase-site.xml
> >
> > Having the files in the WEB-INF/lib/ directory will enable connections
> > out to a remote HBase.  Is this correct?  Or is there more needed?
> >
>
> log4j might be needed, but might be moot because tomcat might already
> include it. (under the assumption that you use the hbase client java
> library).
>
> if you are using thrift / rest , you might need more libraries as well.
>
>
>
>
>
>
> >
> > andrew
> >
> > --
> >
> > On Fri, Mar 26, 2010 at 11:01 AM, George Stathis <gstathis@gmail.com>
> > wrote:
> > > You will need the hadoop-core jar in the classpath. HBaseConfiguration
> > > extends Configuration which is in the hadoop source. You will also need
> > the
> > > Zookeeper jar that's included in the HBase distro. I have a Maven
> project
> > > and I had to manually add the jars to my local repository. The tree
> Jars
> > > that I needed to add for everything to work were:
> > >
> > > [...]
> > > [INFO] |  +- org.apache.hadoop:hbase:jar:0.20.3:compile
> > > [INFO] |  +- org.apache.hadoop:hadoop-core:jar:0.20.2:compile
> > > [INFO] |  +- org.apache.hadoop:zookeeper:jar:3.2.2:compile
> > > [...]
> > >
> > > Hope this helps.
> > >
> > > -GS
> > >
> > > On Fri, Mar 26, 2010 at 10:42 AM, A Levine <levine.a@gmail.com> wrote:
> > >
> > >> Yes:
> > >>
> > >> $> ls -1 WEB-INF/lib/
> > >> geoapi-2.3-M1.jar
> > >> gt-metadata-2.6.0.jar
> > >> gt-referencing-2.6.0.jar
> > >> hbase-0.20.3.jar
> > >> hbase-default.xml
> > >> hbase-site.xml
> > >>
> > >> andrew
> > >>
> > >> --
> > >>
> > >> On Fri, Mar 26, 2010 at 10:27 AM, Guilherme Germoglio
> > >> <germoglio@gmail.com> wrote:
> > >> > Are the hbase jars in your webapp's libs directory? You might need
> > them.
> > >> >
> > >> > On Fri, Mar 26, 2010 at 11:21 AM, A Levine <levine.a@gmail.com>
> > wrote:
> > >> >
> > >> >> I am having the hardest time tying to connect from a running webapp
> > in
> > >> >> Tomcat 6.0 to a remote HBase instance.  Whenever the webapp comes
> to:
> > >> >>
> > >> >> HBaseConfiguration config = new HBaseConfiguration();
> > >> >>
> > >> >> There is an error reported:
> > >> >>
> > >> >> java.lang.NoClassDefFoundError: Could not initialize class
> > >> >> org.apache.hadoop.hbase.HBaseConfiguration
> > >> >>
> > >> >> I can connect to a remote HBase from a stand alone program by
> setting
> > >> >> the classpath to /devel/hbase/conf without any issues.  However,
> when
> > >> >> the code is used in the running webapp, the HBaseConfiguration
> cannot
> > >> >> be initialized.  I know the hbase-default.xml and hbase-site.xml
> need
> > >> >> to be in the CLASSPATH of the webapp so ClassLader can be called
> for
> > >> >> both xml files.  Those places are:
> > >> >>
> > >> >> /WEB-INF/classes/
> > >> >> /WEB-INF/lib/*.jar
> > >> >> $CATALINA_HOME/lib
> > >> >> $CATALINA_HOME/*.jar
> > >> >>
> > >> >> I have put both files in the /WEB-INF/classes/ directory with no
> > >> >> success.  What am I doing wrong?
> > >> >>
> > >> >> andrew
> > >> >>
> > >> >
> > >> >
> > >> >
> > >> > --
> > >> > Guilherme
> > >> >
> > >> > msn: guigermoglio@hotmail.com
> > >> > homepage: http://sites.google.com/site/germoglio/
> > >> >
> > >>
> > >
> >
>

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