title: Batik SVGGraphics2D nullpointerexception when drawing image
body: <p>I'm trying to use the Batik library to draw a BufferedImage to a SVG file. I have very similar code working fine for EPS/PS files, but for some reason the following code:</p>
  
  <pre><code>// Get a DOMImplementation and create an XML document
  DOMImplementation domImpl = GenericDOMImplementation.getDOMImplementation();
  Document document = domImpl.createDocument(null, "svg", null);
  
  // Create an instance of the SVG Generator
  SVGGraphics2D svgGenerator = new SVGGraphics2D(document);
  
  // draw from image into the svg:
  svgGenerator.drawImage(image,new RescaleOp((float)1.0,(float)0.0,null),0,0); 
  
  // Write svg file
  OutputStream outputStream = new FileOutputStream(svgFile);
  Writer out = new OutputStreamWriter(outputStream, "UTF-8");
  
  //svgGenerator.stream(out, true /* use css */);  
  
  // write and close file:                   
  outputStream.flush();
  outputStream.close();
  </code></pre>
  
  <p>Results in a NullPointerException on the svgGenerator.drawImage(...) line. Since basically the same command is working for a AbstractPSDocumentGraphics2D (in another method) I have no idea what's wrong here.</p>
  
  <p>Edit:
  image is declared elsewhere (a class variable, this code is inside a method of that class).</p>
  
  <p>Here is a stacktrace:</p>
  
  <pre><code>Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
  at org.apache.batik.svggen.ImageHandlerBase64Encoder.encodeImage(ImageHandlerBase64Encoder.java:157)
  at org.apache.batik.svggen.ImageHandlerBase64Encoder.handleHREF(ImageHandlerBase64Encoder.java:133)
  at org.apache.batik.svggen.ImageHandlerBase64Encoder.handleHREF(ImageHandlerBase64Encoder.java:72)
  at org.apache.batik.svggen.DefaultImageHandler.handleImage(DefaultImageHandler.java:63)
  at org.apache.batik.svggen.SimpleImageHandler.handleImage(SimpleImageHandler.java:100)
  at org.apache.batik.svggen.SVGGraphics2D.drawImage(SVGGraphics2D.java:677)
  at org.apache.batik.svggen.SVGGraphics2D.drawImage(SVGGraphics2D.java:996)
  at SciTK.SciTK_Image.exportImageAsSVG(SciTK_Image.java:1232)
  at SciTK.SciTK_Image.save_image(SciTK_Image.java:428)
  at SciTK.SciTK_Image$7.actionPerformed(SciTK_Image.java:982)
  at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
  at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
  at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
  at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
  at javax.swing.AbstractButton.doClick(AbstractButton.java:376)
  at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:833)
  at com.apple.laf.AquaMenuItemUI.doClick(AquaMenuItemUI.java:157)
  at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:877)
  at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
  at java.awt.Component.processMouseEvent(Component.java:6505)
  at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
  at java.awt.Component.processEvent(Component.java:6270)
  at java.awt.Container.processEvent(Container.java:2229)
  at java.awt.Component.dispatchEventImpl(Component.java:4861)
  at java.awt.Container.dispatchEventImpl(Container.java:2287)
  at java.awt.Component.dispatchEvent(Component.java:4687)
  at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
  at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
  at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
  at java.awt.Container.dispatchEventImpl(Container.java:2273)
  at java.awt.Window.dispatchEventImpl(Window.java:2719)
  at java.awt.Component.dispatchEvent(Component.java:4687)
  at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:729)
  at java.awt.EventQueue.access$200(EventQueue.java:103)
  at java.awt.EventQueue$3.run(EventQueue.java:688)
  at java.awt.EventQueue$3.run(EventQueue.java:686)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
  at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
  at java.awt.EventQueue$4.run(EventQueue.java:702)
  at java.awt.EventQueue$4.run(EventQueue.java:700)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
  at java.awt.EventQueue.dispatchEvent(EventQueue.java:699)
  at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
  at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
  at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
  at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
  at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
  at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
  </code></pre>