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From "George Harley (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-19) Divide by zero exception when rotating an empty List
Date Fri, 02 Dec 2005 11:57:30 GMT
Divide by zero exception when rotating an empty List

         Key: HARMONY-19
         URL: http://issues.apache.org/jira/browse/HARMONY-19
     Project: Harmony
        Type: Bug
  Components: Contributions  
 Environment: All
    Reporter: George Harley
 Assigned to: Geir Magnusson Jr 

The implementation of method rotate(List, int) in java.util.Collections is not
checking the size of the input list prior to attempting the rotation. As a 
result, when called with an empty List argument a java.lang.ArithmeticException
will occur because of the the subsequent divide by zero operation. 

The problem can be demonstrated in the below unit test case ...

	public void testRotateEmptyList() {
		// Create an *empty* list
		List list = new ArrayList();
		try {
			Collections.rotate(list, 25);
		} catch (Exception e) {
			fail("Unexpected exception rotating empty List : " + e);

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