The answer is to define your own customized user-oriented exception framework. Anticipate this situation and create a customized user-oriented exception, say, UserForgetsToInsertDataException, in the framework. Then, the code should catch the NullPointerException and throw UserForgetsToInsertDataException. It should also print helpful debug messages in both console as well as log file.

try {
// your code here
}catch(NullPointerException ne){
//log() prints in log file as well as console
log("User name is not found");
log("Please provide user name in proper format");
//Throw new customized user-oriented exception
throw new UserForgetsToInsertDataException("Name Not Found");
}