Hi! I had the same problem in the last week, and found the solution, The ArrayDescriptor and ARRAY needed a Native Connection, and the mode to get this is: cstmt = (OracleCallableStatement) getSession().connection().prepareCall(" call REP_UPDATE_STOCK_WAREHOUSE(?, ?, ?, ?, ?) "); ArrayDescriptor descCE = ArrayDescriptor.createDescriptor("NUMBER_NT", cstmt.getConnection()); A OracleCallableStatement.getConnection returns a Native Connection... use that for parameter the ArrayDescriptor.createDescriptor and the ClassCastException will solve. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4011400#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...