Web Sementic Search Engine using ontology with Java

I am developing a search engine using ontology with java for my fyp. The way it works is that user searches for a job through the search engine and that keyword goes into the ontology created and when it matches any relation then it will display the jobs from the extracted data that matches the ontology relation. we have used a web crawler to extract data from different websites and saved it in xml format. The ontology has also been created. The only problem we are facing is :- Using SPARQL. The Jena API has to be used to write SPARQL query and get the keyword and go into the ontology file to match the relations. Once the relations are matched then get the data from xml file and display on webpage. ITs a small task for an Experienced Developer