batik svg 错误 - ITeye问答

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batik svg 错误15

Element mapPanel = getSVGDocument().getElementById("layer_map");
                Element map = getSVGDocument().createElementNS(svgNameSpace, "image");

                map.setAttribute(XMLConstants.XMLNS_PREFIX, "http://www.w3.org/2000/svg");
                map.setAttribute("width", "" + svgMap.getWidth());
                map.setAttribute("height", "" + svgMap.getHeight());
                map.setAttribute("viewBox", "0 0 " + svgMap.getWidth() + " " + svgMap.getHeight());
                map.setAttributeNS(linkNameSpace, "xLink:href", svgMap.getURI());
                mapPanel.appendChild(map);/////590 line
                //renderGVTTree();
                Show.println(this.getClass().getName() + " >> setMap(" + svgMap.getURI() + ") over");

操作过程中弹出对话框，说在590 行以下报错

java.lang.NullPointerException
at org.apache.batik.gvt.UpdateTracker.getNodeDirtyRegion(UpdateTracker.java:182)
at org.apache.batik.gvt.UpdateTracker.getNodeDirtyRegion(UpdateTracker.java:197)
at org.apache.batik.gvt.UpdateTracker.getNodeDirtyRegion(UpdateTracker.java:197)
at org.apache.batik.gvt.UpdateTracker.getNodeDirtyRegion(UpdateTracker.java:197)
at org.apache.batik.gvt.UpdateTracker.getNodeDirtyRegion(UpdateTracker.java:197)
at org.apache.batik.gvt.UpdateTracker.getNodeDirtyRegion(UpdateTracker.java:197)
at org.apache.batik.gvt.UpdateTracker.getNodeDirtyRegion(UpdateTracker.java:197)
at org.apache.batik.gvt.UpdateTracker.getNodeDirtyRegion(UpdateTracker.java:197)
at org.apache.batik.gvt.UpdateTracker.getNodeDirtyRegion(UpdateTracker.java:197)
at org.apache.batik.gvt.UpdateTracker.getNodeDirtyRegion(UpdateTracker.java:197)
at org.apache.batik.gvt.UpdateTracker.getNodeDirtyRegion(UpdateTracker.java:197)
at org.apache.batik.gvt.UpdateTracker.getNodeDirtyRegion(UpdateTracker.java:225)
at org.apache.batik.gvt.UpdateTracker.changeStarted(UpdateTracker.java:256)
at org.apache.batik.gvt.AbstractGraphicsNode.fireGraphicsNodeChangeStarted(AbstractGraphicsNode.java:672)
at org.apache.batik.gvt.AbstractGraphicsNode.fireGraphicsNodeChangeStarted(AbstractGraphicsNode.java:641)
at org.apache.batik.gvt.CompositeGraphicsNode.add(CompositeGraphicsNode.java:736)
at org.apache.batik.bridge.SVGGElementBridge.handleElementAdded(SVGGElementBridge.java:151)
at org.apache.batik.bridge.SVGGElementBridge.handleDOMNodeInsertedEvent(SVGGElementBridge.java:107)
at org.apache.batik.bridge.BridgeContext$DOMNodeInsertedEventListener.handleEvent(BridgeContext.java:1601)
at org.apache.batik.dom.events.EventSupport.fireEventListeners(EventSupport.java:324)
at org.apache.batik.dom.events.EventSupport.fireEventListeners(EventSupport.java:366)
at org.apache.batik.dom.events.EventSupport.dispatchEvent(EventSupport.java:258)
at org.apache.batik.dom.AbstractNode.dispatchEvent(AbstractNode.java:1014)
at org.apache.batik.dom.AbstractParentNode.fireDOMNodeInsertedEvent(AbstractParentNode.java:422)
at org.apache.batik.dom.AbstractParentNode.appendChild(AbstractParentNode.java:224)
at com.zbp.ui.canvas.MapView$10.run(MapView.java:591)
at java.lang.Thread.run(Thread.java:662)

怎么搞啊