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Prior to this commit, if an instance of XStreamMarshaller was used concurrently from multiple threads without having first invoked the afterPropertiesSet() method, the private `xstream` field could be initialized multiple times resulting in a ConcurrentModificationException in XStream's internal DefaultConverterLookup. This commit fixes these concurrency issues by making the `xstream` field volatile and by implementing a double-checked locking algorithm in getXStream() to avoid concurrent instance creation. Closes gh-25017