If I compile xml-fop (from cvs) with JDK 1.4 beta2, I get the following error:

     [echo] Compiling the sources 
    [javac] Compiling 4 source files to /hoth/local/xml-fop/build/classes
    [javac] Note: sun.tools.javac.Main has been deprecated.
    [javac] 
/hoth/local/xml-fop/build/src/org/apache/fop/svg/PDFGraphics2D.java:1128: nested 
class org.apache.fop.svg.PDFGraphics2D. PDFGraphicsConfiguration is an abstract 
class. It can't be instantiated.
    [javac]         return new PDFGraphicsConfiguration();
    [javac]                ^
    [javac] 
/hoth/local/xml-fop/build/src/org/apache/fop/svg/PDFGraphics2D.java:1135: nested 
class org.apache.fop.svg.PDFGraphics2D. PDFGraphicsConfiguration must be 
declared abstract. It does not define java.awt.image.VolatileImage 
createCompatibleVolatileImage(int, int) from class 
java.awt.GraphicsConfiguration.
    [javac]     static class PDFGraphicsConfiguration extends 
GraphicsConfiguration {

It appears that Sun added a new java.awt.VolatileImage class and added a new
abstract method createCompatibleVolatileImage to GraphicsConfiguration which
PDFGraphicsConfiguration extends.  I am not sure what the fix should be since
fixing the code to compile with JDK 1.4 will cause it to break with previous
releases.