Thank you, now I understand. For further inspection, can you post all the bytecode? | public void actionPerformed(java.awt.event.ActionEvent e); | 0 new org.jboss.lang.JBossStringBuilder [27] | 3 dup | 4 ldc <String "Hello"> [29] | ....... | ....... | (I want to know the rest) | Also, I would also like to know the detailed message of the verification error. Thank you for your cooperation! View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4223572#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...