使用迭代集合时出现Concurrentmodification异常

Question

我正在尝试从Set中删除一个对象，而我正在使用Iterator。在JunOffer的第二次迭代中仍然得到concurrentmodificationexception：affoffer = iterator.next（）;.

List<sWrapper> sWrapperList = new ArrayList<sWrapper>();
for (Offering offering : offerings) {
    sWrapper wrapper = new sWrapper(offering);
    Set<JunOffer> junOfferSet = wrapper.getOffering().getJunOffers();
    if (junOfferSet != null) {
        for (Iterator<JunOffer> iterator = junOfferSet.iterator(); iterator.hasNext(); ) {
            JunOffer affoffer = iterator.next();
            if (affoffer.getOfferingType() == null ) {
                junOfferSet.remove(affoffer);
            }
        }
    }
    sWrapperList.add(wrapper);
}

例外：

Caused by: java.util.ConcurrentModificationException
        at java.util.HashMap$HashIterator.nextEntry(HashMap.java:841)
        at java.util.HashMap$KeyIterator.next(HashMap.java:877)
        at org.hibernate.collection.AbstractPersistentCollection$IteratorProxy.next(AbstractPersistentCollection.java:555)
        at com.myself.me.off.services.SearchService.findAndValidateOffer(SearchServiceImpl.java:2536)

请帮忙解决。

提前致谢。