[Geotools-gt2-users] Quickstart instructions - notes

[Tom W. <tom...@co...>]

I tried the new Quickstart instructions and they look great!   Two really simple, newbie-type things (me being the newbie) and a stack trace from an error inside the Quickstart app: 

I did a cut-and-paste to get the text from the pom.xml file in the PDF doc into my Netbeans pom.xml.   Since the document had the text split across two pages, I accidentally picked up the page footer and date and pasted them into my pom.xml file. 

I suggest adding something like this to the section about changing the pom.xml file:
"If, after editing the pom.xml file, your project name changes from "Example" to "Badly formed Maven project", this means you have changed the pom.xml to something Maven doesn't understand.   If you were cutting and pasting text, you most likely pasted the text in the wrong place and this threw Maven off.   Carefully examine the pom.xml file and make sure all the tags line up.  Using the Source/Format menu option will auto-format your pom.xml file for you and should help you find the missing, extra or out-of-place tags."

I ran the Quickstart.java from the PDF, and it did load and display the .shp file (this is further than I've gotten before!  I'm excited!)   However, when I tried to click the "+" and zoom in on the map I got this error:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
        at org.geotools.swing.JMapPane.clearBaseImage(JMapPane.java:790)
        at org.geotools.swing.JMapPane.paintComponent(JMapPane.java:658)
        at javax.swing.JComponent.paint(JComponent.java:1029)
        at javax.swing.JComponent.paintChildren(JComponent.java:864)
        at javax.swing.JComponent.paint(JComponent.java:1038)
        at javax.swing.JComponent.paintChildren(JComponent.java:864)
        at javax.swing.JComponent.paint(JComponent.java:1038)
        at javax.swing.JComponent.paintChildren(JComponent.java:864)
        at javax.swing.JComponent.paint(JComponent.java:1038)
        at javax.swing.JLayeredPane.paint(JLayeredPane.java:567)
        at javax.swing.JComponent.paintChildren(JComponent.java:864)
        at javax.swing.JComponent.paintToOffscreen(JComponent.java:5131)
        at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1475)
        at javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1406)
        at javax.swing.RepaintManager.paint(RepaintManager.java:1220)
        at javax.swing.JComponent.paint(JComponent.java:1015)
        at java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:21)
        at sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:60)
        at sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:97)
        at java.awt.Container.paint(Container.java:1780)
        at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:814)
        at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:714)
        at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:694)
        at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:128)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)