Description of problem:
$Summary

Version-Release number of selected component (if applicable):
Version: 4.8.0-SNAPSHOT
Build Number: 7b31b01

How reproducible:
Always

Steps to Reproduce:
1. ./rhq-cli.sh -p rhqadmin -u rhqadmin
2. var dynaGroupDef = new GroupDefinition("name");
3. dynaGroupDef.setRecalculationInterval(-5)
4. GroupDefinitionManager.createGroupDefinition(dynaGroupDef)

Actual results:
GroupDefinition:
	          createdTime: 1371209654085
	          description: 
	           expression: 
	     expressionAsList: []
	                   id: 10061
	  lastCalculationTime: 
	managedResourceGroups: 
	         modifiedTime: 1371209654085
	                 name: name
	  nextCalculationTime: 1371209654080
	recalculationInterval: -5
	            recursive: false

Definition is created without exception. Recalculation interval visible on GUI is 0, but dynaGroupDef.getRecalculationInterval() returns -5 and nextCalculationTime is from the past.

Expected results:
Exception is with informative message is thrown and definition is not created.

Additional info:
Other values to test [.5,0.5,-5]