No results were returned by the query.

I am using PostGreSQL 7.3 with JDBC driver of
http://jdbc.postgresql.org/download/devpgjdbc2.jar.
Code is:
try{
stat = con.createStatement();
newItemPStat = con.prepareStatement("INSERT INTO rentijad
VALUES(?,?,?,?,?,?,?,?)");
newItemPStat.setInt(1,
Integer.valueOf(values.elementAt(1).toString()).intValue());
for (int x = 2; x < 9; x++) {
newItemPStat.setString(x, values.elementAt(x).toString());
}
ResultSet rs_tmp = newItemPStat.executeQuery();
}catch (SQLException ex) {

}

And after that i get an exception, which stack trace is:
No results were returned by the query.

at
org.postgresql.jdbc1.AbstractJdbc1Statement.executeQuery(AbstractJdbc1Statement.java:157)

at rendifirma.RentijadListModel.insertNewItem(RentijadListModel.java:107)

at
rendifirma.MainFrame.jButtonIR2Salvesta_actionPerformed(MainFrame.java:644)

at rendifirma.MainFrame$12.actionPerformed(MainFrame.java:315)

at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1450)

at
javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1504)

at
javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:378)

at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:250)

at
javax.swing.plaf.basic.BasicRootPaneUI$DefaultAction.actionPerformed(BasicRootPaneUI.java:156)

at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1384)

at javax.swing.JComponent.processKeyBinding(JComponent.java:2078)

at javax.swing.KeyboardManager.fireBinding(KeyboardManager.java:252)

at javax.swing.KeyboardManager.fireKeyboardAction(KeyboardManager.java:205)

at
javax.swing.JComponent.processKeyBindingsForAllComponents(JComponent.java:2145)

at javax.swing.JComponent.processKeyBindings(JComponent.java:2138)

at javax.swing.JComponent.processKeyEvent(JComponent.java:2045)

at java.awt.Component.processEvent(Component.java:3553)

at java.awt.Container.processEvent(Container.java:1164)

at java.awt.Component.dispatchEventImpl(Component.java:2593)

at java.awt.Container.dispatchEventImpl(Container.java:1213)

at java.awt.Component.dispatchEvent(Component.java:2497)

at java.awt.LightweightDispatcher.processKeyEvent(Container.java:2155)

at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2135)

at java.awt.Container.dispatchEventImpl(Container.java:1200)

at java.awt.Window.dispatchEventImpl(Window.java:914)

at java.awt.Component.dispatchEvent(Component.java:2497)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:339)

at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:131)

at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:98)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:85)

My question is:

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