Concurrency lessons from eBay engineers

On JavaOne Technical Sessions 2009 3 engineers from eBay speek about Java concurrency troubles/lessons that they learned.
- Lazy Initialization patern
- Holder pattern
- correct Double-Checked Locking pattern
- Interesting example: ConcurrentMap of AtomicInteger
- DateFormat, MessageDigest, CharsetEncoder/CharsetDecoder - not thread safe
- ThreadLocal pattern
- potential lock contention on Class.forName(...) when missing class
- SAXParserFactory.newInstance().newSAXParser() - potentially significant lock contention on META-INF
P.S. You MUST be resistered at Sun. Its easy.
P.P.S. And, Yes, eBay, Amazon and part of Google writed in Java:)