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Posted to dev@commons.apache.org by bu...@apache.org on 2006/02/08 12:03:45 UTC
DO NOT REPLY [Bug 38565] New: - java.lang.ArrayIndexOutOfBoundsException
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Summary: java.lang.ArrayIndexOutOfBoundsException
Product: Commons
Version: 3.1
Platform: Other
OS/Version: other
Status: NEW
Severity: normal
Priority: P2
Component: Collections
AssignedTo: commons-dev@jakarta.apache.org
ReportedBy: stijn.christiaens@vub.ac.be
In BoundedFifoBuffer (line 340):
// Other elements require us to shift the subsequent elements
int i = lastReturnedIndex + 1;
while (i != end) {
if (i >= maxElements) {
elements[i - 1] = elements[0];
i = 0;
} else {
elements[i - 1] = elements[i];
i++;
}
}
An AIOOBException is thrown at line 347 when trying to remove an element and i = 0.
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DO NOT REPLY [Bug 38565] - [collections] java.lang.ArrayIndexOutOfBoundsException
Posted by bu...@apache.org.
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gudnabrsam@yahoo.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |DUPLICATE
------- Additional Comments From gudnabrsam@yahoo.com 2006-02-08 17:05 -------
Looks like a duplicate of bug 33071.
*** This bug has been marked as a duplicate of 33071 ***
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DO NOT REPLY [Bug 38565] - [collections] java.lang.ArrayIndexOutOfBoundsException
Posted by bu...@apache.org.
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------- Additional Comments From stijn.christiaens@vub.ac.be 2006-02-08 16:41 -------
This little class recreates the bug. It must have something to do with the
automatic remove (which increases the member attribute start), because if there
is no overflow (and thus automatic remove) the problem does not occur. I hope
this helps.
import java.util.Collection;
import java.util.Iterator;
import org.apache.commons.collections.buffer.CircularFifoBuffer;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
Collection<String> breadCrumbs = new CircularFifoBuffer(4);
breadCrumbs.add("1");
breadCrumbs.add("2");
breadCrumbs.add("3");
breadCrumbs.add("4");
breadCrumbs.add("5");
String current = "2";
Iterator<String> iter = breadCrumbs.iterator();
boolean remove = false;
while (iter.hasNext()) {
String temp = iter.next();
if (remove) {
iter.remove();
}
if (current.equals(temp)) {
remove = true;
}
}
if (!remove) {
breadCrumbs.add(current);
}
iter = breadCrumbs.iterator();
while (iter.hasNext()) {
String temp = iter.next();
System.out.println(temp);
}
}
}
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DO NOT REPLY [Bug 38565] - [collections] java.lang.ArrayIndexOutOfBoundsException
Posted by bu...@apache.org.
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gudnabrsam@yahoo.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|java.lang.ArrayIndexOutOfBou|[collections]
|ndsException |java.lang.ArrayIndexOutOfBou
| |ndsException
------- Additional Comments From gudnabrsam@yahoo.com 2006-02-08 15:21 -------
Looking at the code I don't immediately see how this is possible. Can you
attach a testcase (simple main() harness or whatever) that reproduces the problem?
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DO NOT REPLY [Bug 38565] - [collections] java.lang.ArrayIndexOutOfBoundsException
Posted by bu...@apache.org.
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------- Additional Comments From stijn.christiaens@vub.ac.be 2006-02-08 16:11 -------
Actually I am using a CircularFifoBuffer in my class, which extends the
...collections.buffer.BoundedFifoBuffer.
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DO NOT REPLY [Bug 38565] - [collections] java.lang.ArrayIndexOutOfBoundsException
Posted by bu...@apache.org.
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------- Additional Comments From gudnabrsam@yahoo.com 2006-02-08 15:54 -------
Silly question: are you using org.apache.commons.collections.BoundedFifoBuffer
or org.apache.commons.collections.buffer.BoundedFifoBuffer? Based on the code
you provided in the beginning, the former? Maybe you should try the latter.
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DO NOT REPLY [Bug 38565] - [collections] java.lang.ArrayIndexOutOfBoundsException
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------- Additional Comments From gudnabrsam@yahoo.com 2006-02-08 17:03 -------
I can recreate w/ 3.1 but not with SVN HEAD; therefore the bug has already been
fixed.
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DO NOT REPLY [Bug 38565] - [collections] java.lang.ArrayIndexOutOfBoundsException
Posted by bu...@apache.org.
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------- Additional Comments From stijn.christiaens@vub.ac.be 2006-02-08 15:31 -------
This is the code that caused the bug. The variable breadCrumbs is a
BoundedFifoBuffer, but we use the Collection interface.
The target is to run over the buffer. If we encounter an element equal to the
one we have, all next elements in the buffer must be removed.
The Exception happens when the first element in the collection is the element we
have, so all the remaining ones must be removed, and only the first can stay.
The exception happens at the call of iter.remove()
// see if this crumb is already present, because if it is
// we must remove all later ones for a natural feel
// breadCrumbs is a BoundedFifoBuffer, but we use the interface Collection
boolean remove = false;
Iterator<BreadCrumb> iter = breadCrumbs.iterator();
while (iter.hasNext()) {
BreadCrumb tempCrumb = iter.next();
if (remove) {
iter.remove();
}
if (crumb.equals(tempCrumb)) {
remove = true;
}
}
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DO NOT REPLY [Bug 38565] - [collections] java.lang.ArrayIndexOutOfBoundsException
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------- Additional Comments From stijn.christiaens@vub.ac.be 2006-02-08 17:08 -------
Ok. Thanks for the swift assistance!
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