Error java.lang.NullPointerException hibernate

Error java.lang.NullPointerException hibernate

hello everybody; I'm developping a web application using Struts 1.1 , Hibernate 3.1 and Mysql , and I've got this message error: Etat HTTP 500

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error!!!!!!!!!
error!!!!!!!!!   st=con.createStatement(); int a=Integer.parseInt(txttrno.getText()); String b=txttname.getText(); String c=txtfrom.getText(); String d=txtto.getText
error!!!!!!!!!
error!!!!!!!!!   st=con.createStatement(); int a=Integer.parseInt(txttrno.getText()); String b=txttname.getText(); String c=txtfrom.getText(); String d=txtto.getText

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