Try this <xa-datasource-property name="ConnectionProperties">SetBigStringTryClob=true</xa-datasource-property> View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4193529#4193529 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4193529