ConcurrentModificationException thrown by AttachmentDeserializer
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                 Key: CXF-2503
                 URL: https://issues.apache.org/jira/browse/CXF-2503
             Project: CXF
          Issue Type: Bug
          Components: Core
            Reporter: William Tam


The follow stack (based on 2.2.x source) shows 
AttachmentDeserializer.cacheStreamedAttachments (1) is looping on the 
LazyAttachmentCollection.attachments List.

for (Attachment a : attachments.getLoadedAttachments()) {
 ...
}

And, DelegatingInputStream.close() (2) triggers 
LazyAttachmentCollection.hasNext() (3) to insert new item to 
LazyAttachmentCollection.attachments List which causes 
ConcurrentModificationException

Thread [main] (Suspended)       
(3)     LazyAttachmentCollection.hasNext() line: 64     
        AttachmentDeserializer.markClosed(DelegatingInputStream) line: 319      
(2)     DelegatingInputStream.close() line: 47  
        AttachmentDataSource.cache() line: 51   
(1)     AttachmentDeserializer.cacheStreamedAttachments() line: 227     
        AttachmentDeserializer.readNext() line: 192     
        LazyAttachmentCollection.loadAll() line: 52     
        LazyAttachmentCollection.size() line: 108       


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