Hardware Simluator Crashing / Errors

[ybakos]

While testing the ALU, some of my students are experiencing issues with the HardwareSimulator crashing. One student is able to witness errors on the console, but is able to click the 'step' buttons repeatedly, and at some point the simulator takes off again and completes the test.

The hdl implementation is correct and passes the test. The Java error classes are:

Null Pointer Exception
java2d.NullSurfaceData

This is a preliminary problem report and I will provide more information once I can replicate the error.

[ybakos]

Here is some error output and the relevant screenshot of the GUI when hanging.

alu.tst on winxp, java folders jre1.6.0_07


Exception in thread "Thread-31" java.lang.ClassCastException: sun.java2d.NullSur
faceData cannot be cast to sun.java2d.d3d.D3DSurfaceData
        at sun.java2d.d3d.D3DRenderer.copyArea(Unknown Source)
        at sun.java2d.d3d.D3DSurfaceData.copyArea(Unknown Source)
        at sun.java2d.SunGraphics2D.doCopyArea(Unknown Source)
        at sun.java2d.SunGraphics2D.copyArea(Unknown Source)
        at javax.swing.BufferStrategyPaintManager.copyArea(Unknown Source)
        at javax.swing.RepaintManager.copyArea(Unknown Source)
        at javax.swing.JViewport.blitDoubleBuffered(Unknown Source)
        at javax.swing.JViewport.windowBlitPaint(Unknown Source)
        at javax.swing.JViewport.setViewPosition(Unknown Source)
        at javax.swing.JViewport.scrollRectToVisible(Unknown Source)
        at javax.swing.JComponent.scrollRectToVisible(Unknown Source)
        at HackGUI.Utilities.tableCenterScroll(Unknown Source)
        at HackGUI.FileDisplayComponent.setSelectedRow(Unknown Source)
        at HackGUI.ControllerComponent.setCurrentScriptLine(Unknown Source)
        at Hack.Controller.HackController.miniStep(Unknown Source)
        at Hack.Controller.HackController.singleStep(Unknown Source)
        at Hack.Controller.HackController.access$000(Unknown Source)
        at Hack.Controller.HackController$SingleStepTask.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)

[Thomas Tetlaw]

This is the exact same message that I am getting for a test that I wrote for the ALU, which is practically the same as the one provided.