repast s 建模中遇到的网络结构的问题
最近在用repast s 建模做供应链管理的问题，对于repast s 中网络结构的使用很不了解写完代码之后编译出现错误，应该是显示方面的错误，我实在弄不懂
有没有哪位牛人帮我看看错误，或者给我个适用network结构的demo让我学习下
感谢感谢
错误如下：
Exception in thread "Thread-4" javax.media.opengl.GLException: java.lang.NullPointerException
at javax.media.opengl.Threading.invokeOnOpenGLThread(Threading.java:271)
at javax.media.opengl.GLCanvas.maybeDoSingleThreadedWorkaround(GLCanvas.java:410)
at javax.media.opengl.GLCanvas.display(GLCanvas.java:244)
at saf.v3d.Canvas2D.update(Canvas2D.java:113)
at repast.simphony.visualizationOGL2D.DisplayOGL2D.setPause(DisplayOGL2D.java:358)
at repast.simphony.render.RendererManager.setPause(RendererManager.java:57)
at repast.simphony.ui.GUIScheduleRunner$ScheduleLoopRunnable.run(GUIScheduleRunner.java:46)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at saf.v3d.scene.VEdge2D.doGetBoundingSphere(VEdge2D.java:130)
at saf.v3d.scene.VComposite.doGetBoundingSphere(VComposite.java:88)
at saf.v3d.scene.VComposite.doGetBoundingSphere(VComposite.java:88)
at saf.v3d.scene.VRoot.doGetBoundingSphere(VRoot.java:56)
at saf.v3d.scene.VSpatial.getBoundingSphere(VSpatial.java:439)
at saf.v3d.scene.Camera.resetAndCenter(Camera.java:58)
at saf.v3d.Canvas2D.centerScene(Canvas2D.java:273)
at saf.v3d.Canvas2D.reshape(Canvas2D.java:302)
at com.sun.opengl.impl.GLDrawableHelper.reshape(GLDrawableHelper.java:85)
at javax.media.opengl.GLCanvas$DisplayAction.run(GLCanvas.java:431)
at com.sun.opengl.impl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:194)
at javax.media.opengl.GLCanvas$DisplayOnEventDispatchThreadAction.run(GLCanvas.java:452)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source) 源代码贴上来看一下
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