NullPointerException on repeated execution of XSLFTextShape.getTextHeight()

[sujanpatnana]

Hi Team,

I am receiving NullPointerException while running the following code.
The output seems strange as I get value for XSLFTextShape.getTextHeight()
and when the same method execute after few lines code it throws null pointer
in the same object. Here is the code sample.
==========================================
                     XMLSlideShow ppt = new XMLSlideShow();
                     XSLFSlideMaster slideMaster = ppt.getSlideMasters()[0];
                     XSLFSlideLayout slidelayout =
slideMaster.getLayout(SlideLayout.TITLE_AND_CONTENT);
                     XSLFSlide slide = ppt.createSlide(slidelayout);
                      
                     XSLFTextShape box = slide.getPlaceholder(1);

                        final double maxHeight = box.getAnchor().getHeight();
                        System.out.println("maxHeight " + maxHeight);
                        
                        box.clearText();
                        XSLFTextParagraph p = box.addNewTextParagraph();
                        p.addNewTextRun().setText("Sujan Sujan 1  ");
                        System.out.println("box.getText() ->" + box.getText()); 

                        System.out.println("textHeight 0 " + 
box.getTextHeight());
                        
box.addNewTextParagraph().addNewTextRun().setText("Patnana Patnana 2");
                        System.out.println("textHeight 1 " + 
box.getTextHeight());

                        
box.addNewTextParagraph().addNewTextRun().setText("Patnana Patnana 3");
                        System.out.println("textHeight 2 " + 
box.getTextHeight());

                        
box.addNewTextParagraph().addNewTextRun().setText("Patnana Patnana 4");
                        System.out.println("textHeight 3 " + 
box.getTextHeight());
=============================================
O/P

maxHeight 356.37503937007875
box.getText() ->Sujan Sujan 1  
textHeight 0 40.0625
java.lang.NullPointerException
        at
org.apache.poi.xslf.usermodel.XSLFTextShape.drawParagraphs(XSLFTextShape.java:529)
        at
org.apache.poi.xslf.usermodel.XSLFTextShape.getTextHeight(XSLFTextShape.java:455)
        at apapoisample.OverFlowText.overflow(OverFlowText.java:49)
        at apapoisample.OverFlowText.main(OverFlowText.java:24)

Please look into this. This seem to be bug for me. I am using POI 3.9
version.

Thanks in advance for your help.



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