Integer.parseInt does not parse String to int

Question

The code below is from a Servlet trying to read data from a submitted html form. The variable fieldValue is a String and prints correct value (like so BizStr: 5) but when I try to parse this value to integer, it does not print anything.

for(FileItem uploadItem : uploadItems){
  if(uploadItem.isFormField()){
    String fieldName = uploadItem.getFieldName();
    String fieldValue = uploadItem.getString();
    if(fieldName.equals("business_id")){
        out.println("BizStr: "+ fieldValue +"\n");
        out.println("BizInt: "+ Integer.parseInt(fieldValue )+"\n");
    }
  }
}

Why is this string not being parsed into integer?

Solution

Testing:

Integer.parseInt(" 5");  // space before; yields NumberFormatException

Integer.parseInt("5 ");  // space after; yields NumberFormatException

Try trim() on the fieldValue before parsing:

out.println("BizInt: "+ Integer.parseInt(fieldValue.trim() )+"\n");

Comments

[Uncle Iroh]

he did say there was no exception, but trimming is a good suggestion all the same.

[Kyle]

Another note to add to the conversation going on in the comments, this answer is probably a better answer than my replaceAll comment depending on how the number is being used. This will trim trailing and leading whitespace, so ` 5 ` would be acceptable, but 5 5 would still thrown an exception alerting you to a problem. If you don't care and want to try and parse all the numbers even if a space is in the middle, the replaceAll is better.