[Jung-support] [Open Discussion] deserialisation - edges

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The following forum message was posted by igorkvasnicka at http://sourceforge.net/projects/jung/forums/forum/252062/topic/4909437:

Hi,
I am serialising/deserialising graph using GraphML support and when I want to
render graph (after it was deserialised), I am getting this exception:
[code]java.lang.NullPointerException
	at edu.uci.ics.jung.visualization.renderers.BasicEdgeRenderer.paintEdge(BasicEd
geRenderer.java:51)
	at edu.uci.ics.jung.visualization.renderers.BasicRenderer.renderEdge(BasicRende
rer.java:78)
	at edu.uci.ics.jung.visualization.renderers.BasicRenderer.render(BasicRenderer.
java:38)
	at edu.uci.ics.jung.visualization.BasicVisualizationServer.renderGraph(BasicVis
ualizationServer.java:367)
	at edu.uci.ics.jung.visualization.BasicVisualizationServer.paintComponent(Basic
VisualizationServer.java:321)
	at javax.swing.JComponent.paint(JComponent.java:1029)
	at javax.swing.JComponent.paintToOffscreen(JComponent.java:5124)
	at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java
:278)
	at javax.swing.RepaintManager.paint(RepaintManager.java:1225)
	at javax.swing.JComponent._paintImmediately(JComponent.java:5072)
	at javax.swing.JComponent.paintImmediately(JComponent.java:4882)
	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:786)
	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:714)
	at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:694)
	at javax.swing.RepaintManager.access$700(RepaintManager.java:41)
	at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1636)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:641)
	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(AccessControlCo
ntext.java:87)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:611)
	at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:162
)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java
:269)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:18
4)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java
:174)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
[catch] at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
[/code]

when I do not use serialisation (I create a completely new graph), everything
works fine - so serialisation is the problem...
I found out, that g.getEndpoints(...) is returning null
I thought that it is because edges were not deserialised, but  g.getEdges()
is returning correct value

here is my XML file that I use to deserialisation:
[code]<?xml version="1.0" encoding="UTF-8"?>
<graphml xmlns="http://graphml.graphdrawing.org/xmlns/graphml"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns/graphml">
<key id="vertex_name" for="node">
<default>null</default>
</key>
<key id="imageType" for="node">
<default>null</default>
</key>
<key id="y" for="node">
<default>0</default>
</key>
<key id="x" for="node">
<default>0</default>
</key>
<key id="vertex1_name" for="edge">
<default>null</default>
</key>
<key id="vertex2_name" for="edge">
<default>null</default>
</key>
<graph edgedefault="undirected">
<node id="R2">
<data key="vertex_name">R2</data>
<data key="imageType">TOPOLOGY_VERTEX_ROUTER</data>
<data key="y">179.0</data>
<data key="x">519.0</data>
</node>
<node id="R1">
<data key="vertex_name">R1</data>
<data key="imageType">TOPOLOGY_VERTEX_ROUTER</data>
<data key="y">175.0</data>
<data key="x">293.0</data>
</node>
<edge source="R1" target="R2">
<data key="vertex1_name">R1</data>
<data key="vertex2_name">R2</data>
</edge>
</graph>
</graphml>
[/code]

do you know about this issue or could you help me in any way? maybe manually
create endpoints (I doubt it is possible, though)

thanks a lot