If you see First Forum and Second Forum then data must be in database, there is no other option. Maybe you have two datasources defined for Portal and one is for HSQLDB instead of your mysql.
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thanks for ur reply.
how to change the datasource for hsqldb to mysql?
You didn't read install readme for JBoss Portal, didn't you ? ;-)
In your deploy dir there is probably a portal datasource for hsqldb just delete it and place your own to mysql.