Query Execution error

Is joseki necessary to run any SPARQL query?? I haven used it as of now..

When i run the query through SQL PLUS it works fine..

the code snippet is:

package com.rfc.tools.jena.manager.views;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.List;
import org.eclipse.swt.widgets.TabFolder;
import org.eclipse.swt.widgets.TabItem;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.TableItem;
import org.eclipse.swt.widgets.Text;

import com.hp.hpl.jena.query.QuerySolution;
import com.hp.hpl.jena.query.ResultSet;
import com.hp.hpl.jena.rdf.model.RDFNode;
import com.rfc.tools.jena.manager.domain.AppModel;
import com.rfc.tools.jena.manager.domain.QueryExecutor;

public class QueryTab implements Refreshable
{
private final String CRLF = System.getProperty("line.separator");

private Text queryTextBox;
private List modelsList;
private Table resultsTable;
private Button executeButton;
private Composite queryGroup;

public QueryTab(TabFolder parent)
{
TabItem tab = new TabItem(parent, SWT.NONE);
tab.setText("Query");

Application.addListener(this);
layout(tab, parent);
}

private void layout(TabItem tab, Composite parent)
{
Composite group = new Composite(parent, SWT.NONE);
group.setLayout(new GridLayout(1, false));
group.setLayoutData(new GridData(GridData.FILL_HORIZONTAL | GridData.FILL_VERTICAL));
tab.setControl(group);

queryGroup = new Composite(group, SWT.NONE);
queryGroup.setLayout(new GridLayout(3, false));
queryGroup.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));

modelsList = new List(queryGroup, SWT.BORDER | SWT.MULTI);
modelsList.setLayoutData(new GridData(GridData.FILL_VERTICAL));
modelsList.addSelectionListener(new ModelSelectionListener());

queryTextBox = new Text(queryGroup, SWT.BORDER | SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL);
GridData queryTextLayoutData = new GridData(GridData.FILL_HORIZONTAL);
queryTextLayoutData.heightHint = 100;
queryTextBox.setLayoutData(queryTextLayoutData);
queryTextBox.setText("SELECT ?s ?p ?o" + CRLF + "WHERE { ?s ?p ?o . }");

executeButton = new Button(queryGroup, SWT.PUSH);
executeButton.setText("Execute");
executeButton.addSelectionListener(new ExecuteButtonListener());

resultsTable = new Table(group, SWT.SINGLE | SWT.BORDER | SWT.FULL_SELECTION);
resultsTable.setLayoutData(new GridData(GridData.FILL_HORIZONTAL | GridData.FILL_VERTICAL));
resultsTable.setLinesVisible(true);
resultsTable.setHeaderVisible(true);

refresh();
}

public void refresh()
{
modelsList.removeAll();
if (Application.database.isConnected())
{
for (AppModel model : Application.database.listModels())
{
modelsList.add(model.getName());
}
}

refreshExecuteButton();

queryGroup.pack();
}

private void refreshExecuteButton()
{
if (modelsList.getSelectionCount() > 0)
{
executeButton.setEnabled(true);
}
else
{
executeButton.setEnabled(false);
}
}

class ModelSelectionListener extends SelectionAdapter
{
@Override
public void widgetSelected(SelectionEvent e)
{
refreshExecuteButton();
}
}

class ExecuteButtonListener extends SelectionAdapter
{
@SuppressWarnings("unchecked")
@Override
public void widgetSelected(SelectionEvent e)
{
resultsTable.removeAll();
Collection<String> selectedModels = Arrays.asList(modelsList.getSelection());

QueryExecutor executor = new QueryExecutor();
for (AppModel appModel : Application.database.listModels())
{
if (selectedModels.contains(appModel.getName()))
{
executor.addModel(Application.database, appModel);
}
}

ArrayList<String> columns = new ArrayList<String>();

ResultSet results = executor.execute(queryTextBox.getText());
while (results.hasNext())
{
QuerySolution solution = results.nextSolution();

if (columns.size() == 0)
{
Iterator<String> names = solution.varNames();
while (names.hasNext())
{
String name = names.next();
columns.add(name);

TableColumn subject = new TableColumn(resultsTable, SWT.NONE);
subject.setText(name);
subject.setWidth(150);
}
}

TableItem item = new TableItem(resultsTable, SWT.NONE);
for (int i = 0; i < columns.size(); i++)
{
RDFNode node = solution.get(columns.get(i));
item.setText(i, node.toString());
}
}
}
}
}

Thank you so much for the suggestion.. tried that command.. It says table or view doesn exist..

One more question.. Is Configuring ARQ necessary?? i mean i ve included the arq jar file in my library. Do i need to set up the ARQROOT also?? workin in windows, can you please tell me how to do the same??


Thanks and regards,
Sneha C.J