Bug 60985 - HSSFPrintSetup throws NPE when accessing print settings of existing XLS
Summary: HSSFPrintSetup throws NPE when accessing print settings of existing XLS
Status: NEW
Alias: None
Product: POI
Classification: Unclassified
Component: HSSF (show other bugs)
Version: 3.15-FINAL
Hardware: PC All
: P3 normal (vote)
Target Milestone: ---
Assignee: POI Developers List
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2017-04-13 15:28 UTC by Ivan
Modified: 2017-08-25 21:32 UTC (History)
0 users


Attachments
attachment (94.00 KB, application/vnd.ms-excel)
2017-04-13 15:28 UTC, Ivan 		Details
patch in progress (2.63 KB, patch)
2017-04-19 09:24 UTC, Javen O'Neal 		Details | Diff
View All Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description Ivan 2017-04-13 15:28:45 UTC 
Created attachment 34911 [details]
attachment

The following code throws NPE.

Workbook workbook = document.getWorkbook();
        Sheet sheet = workbook.getSheetAt(0);
        HSSFPrintSetup ps = (HSSFPrintSetup) sheet.getPrintSetup();

        ps.setLandscape(true);
Comment 1 Nick Burch 2017-04-13 18:53:45 UTC 
Could your file have no print settings? Can you try checking for that being null?
Comment 2 Ivan 2017-04-13 19:33:28 UTC 
printsetuprecord == null
Comment 3 Javen O'Neal 2017-04-14 08:01:10 UTC 
Can you please include a stack trace of the NPE?
Comment 4 Ivan 2017-04-14 08:30:41 UTC 
java.lang.NullPointerException
	at org.apache.poi.hssf.usermodel.HSSFPrintSetup.setLandscape(HSSFPrintSetup.java:112)
	at ru.iteterin.project.simpleDoc.document.ReadWriteExcel.setPrintOptions(ReadWriteExcel.java:167)
	at ru.iteterin.project.simpleDoc.document.ReadWriteExcel.editExcel(ReadWriteExcel.java:32)
	at ru.iteterin.project.simpleDoc.controllers.Controller.saveChenge(Controller.java:68)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
	at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
	at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
	at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
	at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
	at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
	at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
	at javafx.event.Event.fireEvent(Event.java:198)
	at javafx.scene.Node.fireEvent(Node.java:8413)
	at javafx.scene.control.Button.fire(Button.java:185)
	at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
	at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
	at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
	at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
	at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
	at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
	at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
	at javafx.event.Event.fireEvent(Event.java:198)
	at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
	at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
	at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
	at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
	at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:381)
	at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
	at java.security.AccessController.doPrivileged(Native Method)
	at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:417)
	at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
	at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:416)
	at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
	at com.sun.glass.ui.View.notifyMouse(View.java:937)
	at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
	at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
	at java.lang.Thread.run(Thread.java:745)
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
	at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774)
	at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
	at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
	at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
	at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
	at javafx.event.Event.fireEvent(Event.java:198)
	at javafx.scene.Node.fireEvent(Node.java:8413)
	at javafx.scene.control.Button.fire(Button.java:185)
	at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
	at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
	at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
	at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
	at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
	at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
	at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
	at javafx.event.Event.fireEvent(Event.java:198)
	at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
	at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
	at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
	at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
	at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:381)
	at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
	at java.security.AccessController.doPrivileged(Native Method)
	at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:417)
	at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
	at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:416)
	at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
	at com.sun.glass.ui.View.notifyMouse(View.java:937)
	at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
	at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
	at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
	at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
	... 52 more
Caused by: junit.framework.AssertionFailedError: sheet.getPrintSetup() return null
	at ru.iteterin.project.simpleDoc.document.ReadWriteExcel.setPrintOptions(ReadWriteExcel.java:172)
	at ru.iteterin.project.simpleDoc.document.ReadWriteExcel.editExcel(ReadWriteExcel.java:32)
	at ru.iteterin.project.simpleDoc.controllers.Controller.saveChenge(Controller.java:68)
	... 62 more

https://github.com/mrtopgun/simpleDoc
Comment 5 Ivan 2017-04-19 08:11:58 UTC 
How can you get around this error?
Comment 6 Javen O'Neal 2017-04-19 08:58:48 UTC 
Here's what I had in mind for the fix:

Index: src/java/org/apache/poi/hssf/usermodel/HSSFSheet.java
===================================================================
--- src/java/org/apache/poi/hssf/usermodel/HSSFSheet.java       (revision 1791876)
+++ src/java/org/apache/poi/hssf/usermodel/HSSFSheet.java       (working copy)
@@ -40,6 +40,7 @@
 import org.apache.poi.hssf.record.ExtendedFormatRecord;
 import org.apache.poi.hssf.record.HyperlinkRecord;
 import org.apache.poi.hssf.record.NameRecord;
+import org.apache.poi.hssf.record.PrintSetupRecord;
 import org.apache.poi.hssf.record.Record;
 import org.apache.poi.hssf.record.RecordBase;
 import org.apache.poi.hssf.record.RowRecord;
@@ -1242,7 +1243,8 @@
      */
     @Override
     public HSSFPrintSetup getPrintSetup() {
-        return new HSSFPrintSetup(_sheet.getPageSettings().getPrintSetup());
+        final PrintSetupRecord r = _sheet.getPageSettings().getPrintSetup();
+        return (r==null) ? null : new HSSFPrintSetup(r);
     }
 
     @Override

However, getMargin and setMargin will also throw NPEs if no PrintSetupRecord is present. Should we change HSSFSheet#getPrintSetup() to add a new PrintSetupRecord if none exists? This would mean that a getter has a side-effect, which may be unexpected (especially for read-only behavior).
We could have getPrintSetup() return null, forcing the caller to call HSSFSheet#add/createPrintSetup() (method doesn't exist yet), but this would result in uglier and likely-to-be-incorrect user code.

Currently Ivan gets an NPE because HSSFSheet#getPrintSetup() returns new HSSFPrintSetup(PrintSetupRecord rec=null), and calling setLandscape(Boolean) on a non-null HSSFPrintSetup that wraps a null PrintSetupRecord doesn't have a logical behavior.

Any opinions on what the best solution is here?
Comment 7 Nick Burch 2017-04-19 09:10:56 UTC 
On HSSFWorkbook, getSheet(String name) returns null, and requires callers to check that and create a missing sheet if needed. Same with getName(String name)

On HSSFSheet, getRow(int idx) can return null if none is defined at that index, and requires callers to check that and create a missing row if needed

So, based on that existing pattern, I'd have getPrintSetup() return null if required, and add a create method
Comment 8 Javen O'Neal 2017-04-19 09:24:50 UTC 
Created attachment 34927 [details]
patch in progress
Comment 9 Javen O'Neal 2017-04-19 09:26:25 UTC 
How should HSSFSheet#getMargin and HSSFSheet#setMargin behave when no PrintSetupRecord exists?
Comment 10 Javen O'Neal 2017-04-19 09:31:08 UTC 
https://svn.apache.org/viewvc/poi/trunk/src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFSheet.java?revision=1782894&view=markup#l1352
    public XSSFPrintSetup getPrintSetup() {
        return new XSSFPrintSetup(worksheet);
    }

https://svn.apache.org/viewvc/poi/trunk/src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFPrintSetup.java?revision=1782114&view=markup#l42
    protected XSSFPrintSetup(CTWorksheet worksheet) {
        this.ctWorksheet = worksheet;

        if(ctWorksheet.isSetPageSetup()) {
           this.pageSetup = ctWorksheet.getPageSetup();
        } else {
           this.pageSetup = ctWorksheet.addNewPageSetup();
        }
        if(ctWorksheet.isSetPageMargins()) {
           this.pageMargins = ctWorksheet.getPageMargins();
        } else {
           this.pageMargins = ctWorksheet.addNewPageMargins();
        }
    }

So for parity with XSSF, XSSFSheet#getPrintSetup() would create a new page setup if none exists.
Comment 11 Ivan 2017-04-19 09:39:16 UTC 
I think HSSFSheet # getMargin and HSSFSheet # setMargin should call getOrCreatePrintSetup ()
Comment 12 Ivan 2017-07-06 10:13:08 UTC 
Hello, please tell me when this bug will be fixed? Thank you!