Getting java.lang.Null pointer Exception when i close the pdf file.

Question

Hi,
my application is java based thick client application.
From my application, i am generating report file using crystal report tool.
the report file is exported as pdf format and stored in my local macine. from this path, am displaying the report in a SWT browser.
till now its working fine. when i close the browser, i am getting java.lang.null.pointer exception.
i dont understand from this exception, printed in console.
please help me.
java.lang.NullPointerException
at org.eclipse.swt.ole.win32.OleClientSite.onPaint(OleClientSite.java:921)
at org.eclipse.swt.ole.win32.OleClientSite.access$2(OleClientSite.java:906)
at org.eclipse.swt.ole.win32.OleClientSite$1.handleEvent(OleClientSite.java:131)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1027)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1012)
at org.eclipse.swt.widgets.Composite.WM_PAINT(Composite.java:1424)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:3842)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4541)
at org.eclipse.swt.internal.ole.win32.COM.CoFreeUnusedLibraries(Native Method)
at org.eclipse.swt.ole.win32.OleClientSite.releaseObjectInterfaces(OleClientSite.java:1084)
at org.eclipse.swt.ole.win32.OleControlSite.releaseObjectInterfaces(OleControlSite.java:683)
at org.eclipse.swt.ole.win32.OleClientSite.onDispose(OleClientSite.java:852)
at org.eclipse.swt.ole.win32.OleClientSite.access$1(OleClientSite.java:847)
at org.eclipse.swt.ole.win32.OleClientSite$1.handleEvent(OleClientSite.java:128)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1027)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1008)
at org.eclipse.swt.widgets.Widget.release(Widget.java:804)
at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:755)
at org.eclipse.swt.widgets.Widget.release(Widget.java:807)
at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:755)
at org.eclipse.swt.widgets.Widget.release(Widget.java:807)
at org.eclipse.swt.widgets.Widget.dispose(Widget.java:441)
at com.siemens.med.cad.hqm.reports.ReportViewer$1.widgetDisposed(ReportViewer.java:273)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:117)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1027)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1008)
at org.eclipse.swt.widgets.Widget.release(Widget.java:804)
at org.eclipse.swt.widgets.Widget.dispose(Widget.java:441)
at org.eclipse.swt.widgets.Decorations.dispose(Decorations.java:446)
at org.eclipse.swt.widgets.Shell.dispose(Shell.java:674)
at org.eclipse.swt.widgets.Decorations.closeWidget(Decorations.java:308)
at org.eclipse.swt.widgets.Decorations.WM_CLOSE(Decorations.java:1643)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:3789)
at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:337)
at org.eclipse.swt.widgets.Decorations.windowProc(Decorations.java:1576)
at org.eclipse.swt.widgets.Shell.windowProc(Shell.java:1937)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4528)
at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method)
at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2366)
at org.eclipse.swt.widgets.Shell.callWindowProc(Shell.java:477)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:3877)
at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:337)
at org.eclipse.swt.widgets.Decorations.windowProc(Decorations.java:1576)
at org.eclipse.swt.widgets.Shell.windowProc(Shell.java:1937)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4528)
at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method)
at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2366)
at org.eclipse.swt.widgets.Shell.callWindowProc(Shell.java:477)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:3877)
at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:337)
at org.eclipse.swt.widgets.Decorations.windowProc(Decorations.java:1576)
at org.eclipse.swt.widgets.Shell.windowProc(Shell.java:1937)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4528)
at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:2371)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3420)
at com.siemens.med.cad.hqm.view.mainUI.HQMMainForm.buildMainShell(HQMMainForm.java:246)
at com.siemens.med.cad.hqm.event.UserLoginEventHandler.loginDisplay(UserLoginEventHandler.java:240)
at com.siemens.med.cad.hqm.event.UserLoginEventHandler.widgetSelected(UserLoginEventHandler.java:97)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:228)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3823)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3422)
this is the code i have written for display the report file in a browser:
Display display = Display.getDefault() ;
     Shell shell = new Shell(display, SWT.RESIZE | SWT.CLOSE | SWT.MIN | SWT.MAX | SWT.APPLICATION_MODAL);
shell.setText(reportTitle);
shell.setLayout(new FillLayout());
shell.setMaximized(false);
shell.setSize(800, 600);
Composite comp = new Composite(shell, SWT.NONE);
comp.setLayout(new FillLayout());
final Browser browser = new Browser(comp, SWT.FLAT);
try {
File file = new File(exportFile);
URL url = file.toURL();
browser.setUrl("file:" + url.getPath());
} catch (MalformedURLException malURLEx) {
// malURLEx.printStackTrace();
throw new ProgrammingExceptionAdapter(malURLEx);
shell.addDisposeListener(new DisposeListener() {
public void widgetDisposed(DisposeEvent arg0) {
File file = new File(exportFile);
if (file != null && file.exists()) {
file.delete();
browser.dispose();
shell.open();
shell.setFocus()'

Answer 1

TitiTruc, welcome to the forum. Please don't post in threads that are long dead. When you have a question, start your own topic. Feel free to provide a link to an old post that may be relevant to your problem.
I'm locking this thread now.
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