RE: Yet Another Newbie Question

["Blair Wyman" <blairw@xxxxxxxxxx>]

Based on the error message, which points to line 6, the problem is that the
program apparently expects some command line parameters that aren't being
passed.

ArrayIndexOutOfBoundsException is signalled when an attempt is made to
access an non-existent element of an array -- in this case, the array in
question is the array of java.lang.String called "argv".  The reference to
argv[0] and/or argv[1] signals the exception.

Clearly, the program wants a couple of parameters, but what are they?
(Inspection of the code suggests they are the parameters to the
QSYSObjectPathName constructor, so I'm going to guess they are "library"
and "filename".)

Not to get too pedantic, but there are a couple of ways the code could be
changed to avoid this somewhat confusing exception.

An explicit check for the length of the array would work:

---------8<---- snip -----8< --------
import com.ibm.as400.access.*;
class TestRecordLevelAccess
{
  public static void main(String argv[]) {
    if (argv.length < 2) {
      System.err.println("usage: TestRecordLevelAccess <library>
<filename>");
      System.exit(1);
    }
    AS400 system = new AS400();
    String filePath = (new QSYSObjectPathName(argv[0],
argv[1],"FILE")).getPath();
    // ...
---------8<---- snip -----8< --------


...or a "try/catch" could be put up (though it would be overkill, IMHO):

---------8<---- snip -----8< --------
import com.ibm.as400.access.*;
class TestRecordLevelAccess
{
  public static void main(String argv[]) {
    AS400 system = new AS400();
    try {
      String filePath = (new QSYSObjectPathName(argv[0],
argv[1],"FILE")).getPath();
    } catch(ArrayIndexOutOfBoundsException e) {
      System.err.println("usage: TestRecordLevelAccess <library>
<filename>");
     System.exit(1);
    }
    //...
---------8<---- snip -----8< --------

-blair

Blair Wyman -- IBM Rochester -- (507) 253-2891
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"The first principle is that you must not fool yourself -
  and you are the easiest person to fool."   -- Richard P. Feynman

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