[stringtemplate-interest] [ST4 Beta-4] NullPointerException in STViz

[Udo Borkowski]

STViz may throw an NPE. 

Steps to reproduce:

1) Inspect this group, rendering main():

t1(q1="Some\nText") ::= <<
<q1>
>>

t2(p1) ::= <<
<p1>
>>

main() ::= <<
START-<t1()>-END

START-<t2(p1="Some\nText")>-END
>>


2) select "t2" in the upper left tree

3) select "p1" under "EXPR" in bottom right tree ("template")

4) select "t1" in the upper left tree

--> throws this exception:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at org.stringtemplate.v4.gui.STViz$2.valueChanged(STViz.java:100)
	at javax.swing.JTree.fireValueChanged(JTree.java:2820)
	at javax.swing.JTree$TreeSelectionRedirector.valueChanged(JTree.java:3191)
	at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(DefaultTreeSelectionModel.java:629)
	at javax.swing.tree.DefaultTreeSelectionModel.clearSelection(DefaultTreeSelectionModel.java:570)
	at javax.swing.JTree.clearSelection(JTree.java:2557)
	at javax.swing.JTree.setModel(JTree.java:833)
	at org.stringtemplate.v4.gui.STViz.updateCurrentST(STViz.java:198)
	at org.stringtemplate.v4.gui.STViz.access$0(STViz.java:193)
	at org.stringtemplate.v4.gui.STViz$1.valueChanged(STViz.java:90)
	at javax.swing.JTree.fireValueChanged(JTree.java:2820)
	at javax.swing.JTree$TreeSelectionRedirector.valueChanged(JTree.java:3191)
	at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(DefaultTreeSelectionModel.java:629)
	at javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(DefaultTreeSelectionModel.java:1078)
	at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPaths(DefaultTreeSelectionModel.java:287)
	at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPath(DefaultTreeSelectionModel.java:170)
	at javax.swing.JTree.setSelectionPath(JTree.java:1598)
	at javax.swing.plaf.basic.BasicTreeUI.selectPathForEvent(BasicTreeUI.java:2311)
	at javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(BasicTreeUI.java:3520)
	at javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressed(BasicTreeUI.java:3459)
	at java.awt.Component.processMouseEvent(Component.java:6349)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
	at java.awt.Component.processEvent(Component.java:6117)
	at java.awt.Container.processEvent(Container.java:2085)
	at java.awt.Component.dispatchEventImpl(Component.java:4714)
	at java.awt.Container.dispatchEventImpl(Container.java:2143)
	at java.awt.Component.dispatchEvent(Component.java:4544)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4621)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4279)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4212)
	at java.awt.Container.dispatchEventImpl(Container.java:2129)
	at java.awt.Window.dispatchEventImpl(Window.java:2478)
	at java.awt.Component.dispatchEvent(Component.java:4544)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:635)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

Udo

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