gcj on apache poi

I am trying to compile gcj as a shared libaray which I can load from my
applications
I have included xml-apis.jar as I have a compilation error for
javax.xml.parsers.DocumentBuilderFactory

gcj -shared -classpath xml-apis.jar -Lxml-apis.jar.so
poi-3.1-FINAL.jar -o poi-3.1-FINAL.jar.so  -findirect-dispatch
-Bsymbolic

My gcj is 3.4.5

But now I have another problem..

org/apache/poi/hssf/record/formula/functions/XYNumericFunction.java:
In class `org.apache.poi.hssf.record.formula.functions.XYNumericFunction':
org/apache/poi/hssf/record/formula/functions/XYNumericFunction.java:
In method
`org.apache.poi.hssf.record.formula.functions.XYNumericFunction.getValues(org.apache.poi.hssf.record.formula.eval.Eval,org.apache.poi.hssf.record.formula.eval.Eval)':
org/apache/poi/hssf/record/formula/functions/XYNumericFunction.java:135:
error: verification error at PC=106
org/apache/poi/hssf/record/formula/functions/XYNumericFunction.java:135:
error: invalid argument type
org/apache/poi/hssf/record/formula/functions/XYNumericFunction.java:135:
error: expected type 'org.apache.poi.hssf.record.formula.eval.Eval[]'
but stack contains 'java.lang.Object[]'
org/apache/poi/hssf/usermodel/HSSFPicture.java: In class
`org.apache.poi.hssf.usermodel.HSSFPicture':
org/apache/poi/hssf/usermodel/HSSFPicture.java: In method
`org.apache.poi.hssf.usermodel.HSSFPicture.getResolution(javax.imageio.ImageReader)':
org/apache/poi/hssf/usermodel/HSSFPicture.java:198: error: cannot find
file for class javax.imageio.ImageReader
org/apache/poi/hssf/usermodel/HSSFPicture.java:198: error: cannot find
file for class javax.imageio.metadata.IIOMetadata
org/apache/poi/hssf/usermodel/HSSFPicture.java:202: error: cannot find
file for class javax.imageio.ImageReader
org/apache/poi/hssf/usermodel/HSSFPicture.java:202: confused by
earlier errors, bailing out
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