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I need ireporting working example  RSS feed

 
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Hi experts , I am looking for a working example that explains generating simple report in excel or pdf
all examples I found , when I use them it gives me this error !!!

log4j:WARN No appenders could be found for logger (net.sf.jasperreports.engine.xml.JRXmlDigesterFactory).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" java.lang.NoClassDefFoundError: org/codehaus/groovy/control/CompilationFailedException


please help me
thanks in advance
 
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