DemoController.groovy

package demo
class DemoController {
  def someAction() {
         // do some work
  }
  def handleSQLException(SQLException e) {
         render 'A SQLException Was Handled'
  }
  def handleBatchUpdateException(BatchUpdateException e) {
         redirect controller: 'logging', action: 'batchProblem'
  }
  def handleNumberFormatException(NumberFormatException nfe) {
         [problemDescription: 'A Number Was Invalid']
  }
}