Chart Customize code Debug

Hi Everyone, 

I override   customize(JFreechart chart, JRChart chart)   method  in Eclipse and created the jar and added that jar in jasperserver's lib folder.

I want to debug the code i wrote above since its not working.  

How can i debug it ? I added sysout statement at couple of places inside customize() method , but they are getting printed in jasperserver.log files.

Please suggest .

PS : Utlimately , I want to access  Bar' Chart ' Series expression data . So my customization need's Series expression value.

Regards,

Ankush