Two Guys Arguing

Installation of the Joseki SPARQL Endpoint in front of Oracle on Ubuntu

Posted in configuration by youngnh on 11.23.10

Here’s one from my archives. It was a bitch to come by, so hopefully this will help some other poor soul tasked with setting up a HTTP interface to Oracle’s semantic store.

Preparation

First, install Oracle on Ubuntu. That’s a pain, and only partially covered elsewhere. My notes on that subject, however, are enough for an entire months worth of blog posts, so I’m saving them for next November.

Once you’re done with the first step, you’ll want to enable semantic support, install a semantic network, maybe create a model or two, populate them and then make them queryable with a shiny SPARQL web service endpoint.

To enable Oracle’s semantic support (from here):

sqlplus / as SYSDBA
@$ORACLE_HOME/md/admin/catsem.sql

To create a semantic network (from here):

CREATE TABLESPACE rdf_tblspace
  DATAFILE '/u01/app/oracle/oradata/tseval/rdf_tblspace.dat' SIZE 1024M REUSE
  AUTOEXTEND ON NEXT 256M MAXSIZE UNLIMITED
  SEGMENT SPACE MANAGEMENT AUTO;

EXEC SEM_APIS.CREATE_SEM_NETWORK('rdf_tblspace');

Create a user in Oracle and grant them privileges:

create user rdfuser
identified by rdfuser
default tablespace users
temporary tablespace temp;

grant connect to rdfuser;

SPARQL Endpoint

Install Tomcat 6:

sudo apt-get install tomcat6

Download Joseki 3.4.0 and the latest Jena adaptor for Oracle (from here and here):

unzip joseki-3.4.0.zip
mv Joseki-3.4.0 joseki  

mkdir jena_adaptor
cd jena_adaptor
unzip ../jena_adaptor_for_release11.2.zip

The Joseki web app must be carefully put together using files from each. Copy a directory from joseki as a starting directory to construct the web apps:

cp -R joseki/webapps/joseki joseki.war.d
cp -R joseki/lib joseki.war.d/WEB-INF

And copy away:

cp jena_adaptor/joseki/* joseki.war.d
cp jena_adaptor/web/* joseki.war.d/WEB-INF
cp jena_adaptor/jar/* joseki.war.d/WEB-INF/lib

The sdordfclient.jar in the jena_adaptor has since been superceded and doesn’t work with Tomcat anyway (insert grumblings about WebLogic here). I got my hands on a copy of the latest version thanks to having sweet contacts inside the Oracle mothership, if you do too, you’ll want to put that in there. If you don’t, you should give up now and make something of your life.

The webapp needs Oracle’s sdordf.jar from your installation:

cp $ORACLE_HOME/md/jlib/sdordf.jar joseki.war.d/WEB-INF/lib
cp $ORACLE_HOME/jdbc/lib/ojdbc6.jar joseki.war.d/WEB-INF/lib

And Joseki comes with a replacement for Tomcat’s default servlet-api jar:

rm joseki.war.d/WEB-INF/lib/servlet-api-2.5.jar
mv joseki.war.d/WEB-INF/lib/servlet-api-2.5-6.1.10.jar /usr/share/java
cd /usr/share/tomcat6/lib
rm servlet-api-2.5.jar
ln -s ../../java/servlet-api-2.5-6.1.10.jar servlet-api-2.5.jar

Next, add this file to make an Oracle datasource that Oracle’s Joseki service will look for:
joseki.war.d/META-INF/context.xml

<?xml version="1.0" encoding="UTF-8"?>
<Context>
  <Resource name="OracleSemDS"
            auth="Container"
            type="oracle.jdbc.pool.OracleDataSource"
            factory="oracle.jdbc.pool.OracleDataSourceFactory"
            user="" 
            password=""
            driverClassName="oracle.jdbc.driver.OracleDriver"
            url="jdbc:oracle:thin:@localhost:1521/orcl"
            validationQuery="select 1 from dual"
            maxActive="30"
            maxIdle="10"
            maxWait="-1"/>
</Context>

Also, I’d bump up the number of connections in Joseki’s connection pool
joseki.war.d/joseki-config.ttl:

<#oracle> rdf:type oracle:Dataset;
    joseki:poolSize     30 ;         ## Number of concurrent connections allowed to this dataset.
    oracle:connection
    [ a oracle:OracleConnection ;
    ];
    oracle:defaultModel [ oracle:firstModel "M1" ] .

Verify that your directory structure looks like so:

./joseki.war.d:
application.xml
crossdomain.xml
index.html
joseki-config.ttl
META-INF
query.html
robots.txt
sparqler-details.html
sparql.html
StyleSheets
update.html
validator.html
WEB-INF
xml-to-html.xsl

./joseki.war.d/META-INF:
context.xml

./joseki.war.d/StyleSheets:
joseki.css

./joseki.war.d/WEB-INF:
lib
web.xml

./joseki.war.d/WEB-INF/lib:
arq-2.8.0.jar
arq-2.8.0-tests.jar
icu4j-3.4.4.jar
iri-0.7.jar
jena-2.6.0.jar
jenatest-2.6.0.jar
jetty-6.1.10.jar
jetty-util-6.1.10.jar
joseki-3.4.0.jar
junit-4.5.jar
log4j-1.2.12.jar
lucene-core-2.3.1.jar
ojdbc5.jar
sdordfclient.jar
sdordf.jar
slf4j-api-1.5.6.jar
slf4j-log4j12-1.5.6.jar
stax-api-1.0.1.jar
wstx-asl-3.2.9.jar
xercesImpl-2.7.1.jar

Create the joseki war file:

cd joseki.war.d
jar cvf ../joseki.war .

Deploy it:

mv joseki.war /var/lib/tomcat6/webapps

Goodluck and Godspeed.

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One Response

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  1. Rob Stewart said, on 02.28.11 at 8:53 am

    Thank you very much… This worked perfectly. I now have a fully compliant LinkedData setup !


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