Double-Checked Locking anti pattern in WeakFastHashMap

The implementation of WeakFastHashMap has the flaw of implementing the Double-Checked Locking anti pattern (see JavaDoc of that class). As described in the JavaDoc "This class is not cross-platform.". In https://issues.apache.org/jira/browse/BEANUTILS-318 and https://issues.apache.org/jira/browse/BEANUTILS-373 this was solved for MethodUtils (usage of WeakFastHashMap). But following classes still use WeakFastHashMap for a cache: BeanUtils, ConvertUtilsBean, PropertyUtilsBean, LocaleConvertUtilsBean.

I would suggest to make WeakFastHashMap deprecated and to change every usage of that class inside the commons-beanutils classes to a synchronized normal WeakHashMap like done (as the second step) in https://issues.apache.org/jira/browse/BEANUTILS-318. Otherwise strange things may happen in unusual plattforms/environments. An alternative could be to use "volatile" inside WeakFastHashMap which would fix it for Java 5 and higher (see http://en.wikipedia.org/wiki/Double-checked_locking or http://www.cs.umd.edu/~pugh/java/memoryModel/jsr-133-faq.html#volatile).