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Normal Topic Error saving CompositeNode to XML (Read 6115 times)
AR
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Error saving CompositeNode to XML
Nov 29th, 2016 at 10:41am
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We have been using Composite Nodes for several years without problems, but we have suddenly noticed an error which occurs when we create and save several nodes in a row (usually but not always the 4th Node causes the error).

The error text is:
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29-Nov-2016 05:07:23,805 ERROR - [ourClass]                           - Error saving diagram data
java.lang.NullPointerException
        at com.mindfusion.diagramming.XmlPersistContext.writeRectangleF(Unknown Source)
        at com.mindfusion.diagramming.components.ComponentBase.saveToXml(Unknown Source)
        at com.mindfusion.diagramming.components.ContainerComponent.saveToXml(Unknown Source)
        at com.mindfusion.diagramming.components.ContainerComponent.saveComponents(Unknown Source)
        at com.mindfusion.diagramming.CompositeNode.saveToXml(Unknown Source)
......

We would like to understand why this might be happening so we can try to prevent or handle it.

Can you shed any light on possible causes of this problem?

(OS: Windows 10, Java Version: 1.8.0_74-b02 JVM Version: 64)
  
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Slavcho
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Re: Error saving CompositeNode to XML
Reply #1 - Nov 30th, 2016 at 9:01am
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Is there any difference between that 4th node and the previous ones? like containing different kinds of components?
  
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AR
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Re: Error saving CompositeNode to XML
Reply #2 - Nov 30th, 2016 at 10:11am
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No they are all the same - contain some text and an image and an empty node which will contain text later.

We wondered if specific text or a specific image was the problem but have tested lots of different text and images in lots of orders without any pattern other than it is usually about the 4th one.

But it can be the first Composite Node on a particular diagram sometimes, especially if we've put several of the Composite Nodes on another diagram first.
  
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Re: Error saving CompositeNode to XML
Reply #3 - Nov 30th, 2016 at 10:42am
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What do you mean by an empty node? A TextComponent without text set, or an empty panel component?
  
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AR
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Re: Error saving CompositeNode to XML
Reply #4 - Nov 30th, 2016 at 11:43am
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A text component without any text set.
  
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Slavcho
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Re: Error saving CompositeNode to XML
Reply #5 - Nov 30th, 2016 at 12:47pm
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Are you using the SimplePanel component? I can see uninitialized Rectangle2D field in its code which would crash if the layout pass hasn't passed at least once, e.g. if you call saveToXml immediately after adding a node. Check if running this before savetoXml will fix it -

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Graphics2D g = (Graphics2D)getGraphics();
for (DiagramNode node : diagram.getNodes())
{
	if (node instanceof CompositeNode)
	{
		Rectangle2D.Float r = node.getBounds();
		((CompositeNode)node).arrangeComponents(
			new Rectangle2D.Float(0, 0, r.width, r.height), g);
	}
}
« Last Edit: Dec 1st, 2016 at 10:08am by Slavcho »  
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Re: Error saving CompositeNode to XML
Reply #6 - Dec 1st, 2016 at 10:08am
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This build should let you save without showing components on screen first -
https://mindfusion.eu/_temp/jdiag_compxml.zip

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CompositeNode node = new CompositeNode();
node.getComponents().add(new SimplePanel());
node.getComponents().add(new TextComponent());
node.getComponents().add(new ImageComponent());
diagram.getNodes().add(node);
diagram.saveToXml("test.xml");


Regards,
Slavcho
Mindfusion
  
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