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From: bugzilla@apache.org
To: commons-dev@jakarta.apache.org
Subject: DO NOT REPLY [Bug 37450]  New:  -
    LazyList throws IndexOutOfBoundsException when trying to set a value out
 of list bounds
Message-Id: <20051110160508.B8A9D21E@ajax.apache.org>
Date: Thu, 10 Nov 2005 17:05:08 +0100 (CET)

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http://issues.apache.org/bugzilla/show_bug.cgi?id=37450

           Summary: LazyList throws IndexOutOfBoundsException when trying to
                    set a value out of list bounds
           Product: Commons
           Version: 3.1
          Platform: PC
        OS/Version: Windows XP
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: Collections
        AssignedTo: commons-dev@jakarta.apache.org
        ReportedBy: hestonfernandes@yahoo.com


This was discovered when using struts 1.2.7 with dynamic forms (Tomcat 5.0.24,
jdk 1.4.2). The reset() method in the ActionForm used LazyList.decorate(). 

        if(rooms==null) {
            rooms = new ArrayList();
            roomPrefs.add("-");
            roomPrefs = LazyList.decorate(roomPrefs, factory);
        }


However after reset() I get the error below when it tries to initialize the
ArrayList. 

IndexOutOfBoundsException -> Index: 1, Size: 1
java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
	at java.util.ArrayList.RangeCheck(ArrayList.java:507)
	at java.util.ArrayList.set(ArrayList.java:340)
	at
org.apache.commons.collections.list.AbstractListDecorator.set(AbstractListDecorator.java:97)
	at
org.apache.commons.beanutils.PropertyUtilsBean.setIndexedProperty(PropertyUtilsBean.java:1417)
	at org.apache.commons.beanutils.BeanUtilsBean.setProperty(BeanUtilsBean.java:1016)
	at org.apache.commons.beanutils.BeanUtilsBean.populate(BeanUtilsBean.java:811)
	at org.apache.commons.beanutils.BeanUtils.populate(BeanUtils.java:298)
	at org.apache.struts.util.RequestUtils.populate(RequestUtils.java:493)
	at
org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:805)
	at ....


Possible Solution: For now I've created a class similar to LazyList and have
overridden the set(object, element) method and it has worked. 

    public Object set(int index, Object element) {
        int size = list.size();

        // Grow the list
        if (index >= size) {
            for (int i = size; i <= index; i++) {
                list.add(null);
            }
        }
        return list.set(index, element);
    }

I'm not sure if I'm using LazyList the right way but thought I'd bring it to
your attention.

Thanks!

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