Como chamar .Jasper no SQL Server

public void DisplayReport() {
        Connection conn = null;
        try {
            Class.forName("net.sourceforge.jtds.jdbc.Driver").newInstance();
            String reportname = "C:/Users/Bruno/Desktop/EPI/EPI/Relatorios/EstoqueGeral.jasper";
            InputStream fis = this.getClass().getClassLoader().getResourceAsStream(reportname);
            conn = DriverManager.getConnection("jdbc:jtds:sqlserver://server-protheus:1433/EPI", "bruno", "bruno");
            HashMap map = new HashMap();
            JasperPrint print = JasperFillManager.fillReport(fis, map, conn);
            JasperViewer jv = new JasperViewer(print, false); // false Needed not to close parent frame
            jv.setVisible(true);
        } catch (Exception ex) {
            ex.printStackTrace();
        } finally {
            if (conn != null) {
                try {
                    conn.close();
                } catch (Exception ex) {
                    System.err.println(ex);
                }
            }
        }
    }

erro

        at java.io.ObjectInputStream$PeekInputStream.read(ObjectInputStream.java:2265)
        at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2278)
        at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:2749)
        at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:779)
        at java.io.ObjectInputStream.<init>(ObjectInputStream.java:279)
        at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:191)
        at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:361)
        at epi.fr_relatAtual.DisplayReport(fr_relatAtual.java:278)
        at epi.fr_relatAtual.jButton2ActionPerformed(fr_relatAtual.java:268)
        at epi.fr_relatAtual.access$600(fr_relatAtual.java:22)
        at epi.fr_relatAtual$8.actionPerformed(fr_relatAtual.java:171)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
        at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
        at java.awt.Component.processMouseEvent(Component.java:6288)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
        at java.awt.Component.processEvent(Component.java:6053)
        at java.awt.Container.processEvent(Container.java:2041)
        at java.awt.Component.dispatchEventImpl(Component.java:4651)
        at java.awt.Container.dispatchEventImpl(Container.java:2099)
        at java.awt.Component.dispatchEvent(Component.java:4481)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
        at java.awt.Container.dispatchEventImpl(Container.java:2085)
        at java.awt.Window.dispatchEventImpl(Window.java:2478)
        at java.awt.Component.dispatchEvent(Component.java:4481)
        at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:643)
        at java.awt.EventQueue.access$000(EventQueue.java:84)
        at java.awt.EventQueue$1.run(EventQueue.java:602)
        at java.awt.EventQueue$1.run(EventQueue.java:600)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
        at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
        at java.awt.EventQueue$2.run(EventQueue.java:616)
        at java.awt.EventQueue$2.run(EventQueue.java:614)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:613)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
CONSTRUÍDO COM SUCESSO (tempo total: 5 segundos)