Turn on debug info in the build.xml and recompile FOP. Having line
numbers will make it a lot easier for you to track down the problem.
Looking at the source of Driver I guess you don't have a method
addToBuilder(FOTreeBuilder) in your ElementMapping implementation.

On 21.11.2002 22:25:24 Raffi Simon wrote:
> I follow the directions to extend FOP, I created a jar file with my classes 
> and place a org.apache.fop.fo.ElementMapping file in the jar and when I run 
> the FOP with my custom element I get the following.
> [INFO] FOP 0.20.4rc
> Exception in thread "main" java.lang.AbstractMethodError
>         at org.apache.fop.apps.Driver.addElementMapping(Unknown Source)
>         at org.apache.fop.apps.Driver.addElementMapping(Unknown Source)
>         at org.apache.fop.apps.Driver.setupDefaultMappings(Unknown Source)
>         at org.apache.fop.apps.Driver.<init>(Unknown Source)
>         at org.apache.fop.apps.CommandLineStarter.run(Unknown Source)
>         at org.apache.fop.apps.Fop.main(Unknown Source)
> Can anyone help?
> -Raf


Jeremias Maerki


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