Bug 17256 Exception due to bug 17208
bundles/org.eclipse.core.databinding/src/org/eclipse/core/databinding/UpdateStrategy.java
if (converterOrClassname instanceof IConverter) {
				return (IConverter) converterOrClassname;
			} else if (converterOrClassname instanceof String) {
				String classname = (String) converterOrClassname;
				Class converterClass;
				try {
					converterClass = Class.forName(classname);
					IConverter result = (IConverter) converterClass
							.newInstance();
					converterMap.put(key, result);
					return result;
				} catch (Exception e) {
					Policy
							.getLog()
							.log(
									new Status(
											IStatus.ERROR,
											Policy.JFACE_DATABINDING,
											0,
											"Error while instantiating default converter", e)); 
				}
			}
		}
		
		
		
		if (fromClass.isAssignableFrom(toClass)) {
			return new IdentityConverter(fromClass, toClass);
		}
		return new DefaultConverter(fromType, toType);