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Date: Wed, 12 Jan 2005 18:51:05 +0100
Message-Id: <200501121751.j0CHp5Ra007561@ajax.apache.org>
From: bugzilla@apache.org
To: commons-dev@jakarta.apache.org
Subject: DO NOT REPLY [Bug 33067]  New:  -
    EqualsBuilder.append(Object[],
 Object[]) crashes with a NullPointerException if an element of the first
 array is null

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http://issues.apache.org/bugzilla/show_bug.cgi?id=33067

           Summary: EqualsBuilder.append(Object[], Object[]) crashes with a
                    NullPointerException if an element of the first array is
                    null
           Product: Commons
           Version: 2.0 Final
          Platform: Macintosh
        OS/Version: Mac OS X 10.3
            Status: NEW
          Keywords: PatchAvailable
          Severity: critical
          Priority: P1
         Component: Lang
        AssignedTo: commons-dev@jakarta.apache.org
        ReportedBy: andrew@terracottatech.com


If you use EqualsBuilder.append(Object[], Object[]), and the first array contains an element that is null 
(and before any other mismatches between the arrays are present), then EqualsBuilder will throw a 
NullPointerException at line 513.

Steps to reproduce:

  Object[] x1 = new Object[] { new Integer(1), null, new Integer(3) };
  Object[] x2 = new Object[] { new Integer(1), new Integer(2), new Integer(3) };

  new EqualsBuilder().append(x1, x2);

The third line of this program will crash.

Attached is a patch that fixes this bug and adds code to an existing unit-test case that proves it's fixed 
(i.e., the test fails without the source patch, and passes with it, and is a valid test).

This patch also fixes another bug related to exact types of objects in an array (which I'm about to enter, 
and which I will relate to this bug if I figure out how :-).

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