question: @ RequestMapping ( value = { "" , "/" } , method = RequestMethod . GET ) @ ResponseBody public RestWrapper list ( @ RequestParam ( value = "pid" , defaultValue = "0" ) Integer pid , @ RequestParam ( value = "page" , defaultValue = "0" ) int startPage , @ RequestParam ( value = "size" , defaultValue = "10" ) int pageSize , Principal principal ) { LOGGER . info ( "pid = " + pid ) ; LOGGER . info ( "startPage = " + startPage ) ; RestWrapper restWrapper = null ; Integer processId = pid ; try { if ( pid == 0 ) { processId = null ; } if ( processId != null ) processDAO . securityCheck ( processId , principal . getName ( ) , "read" ) ; List < InstanceExec > instanceExecs = instanceExecDAO . list ( processId , startPage , pageSize ) ; for ( InstanceExec ie : instanceExecs ) { ie . setTableStartTs ( DateConverter . dateToString ( ie . getStartTs ( ) ) ) ; ie . setTableEndTs ( DateConverter . dateToString ( ie . getEndTs ( ) ) ) ; } restWrapper = new RestWrapper ( instanceExecs , RestWrapper . OK ) ; LOGGER . info ( "All records listed from InstanceExec by User:" + principal . getName ( ) ) ; } catch ( MetadataException e ) { LOGGER . error ( e ) ; restWrapper = new RestWrapper ( e . getMessage ( ) , RestWrapper . ERROR ) ; } catch ( SecurityException e ) { LOGGER . error ( e ) ; restWrapper = new RestWrapper ( e . getMessage ( ) , RestWrapper . ERROR ) ; } return restWrapper ; }
target:  This method calls proc ListInstanceExec and fetches a list of instances of InstanceExec.