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Poor man's approach in practice
One day we ran into problem when an application was randomly starting using more CPU resources as usual. It continued picking more and more CPU resources from time to time. Thread dump showed many threads though we couldn't understand wich of them is
MySQL: ON DUPLICATE KEY UPDATE breaks generated key list of extended INSERT
When extended INSERT (insert with several tuples in one query) is used with ON DUPLICATE KEY UPDATE clause and there're unique key conflict the Connector/J's Statement will return incorrect list of generated identifiers that cannot be matched with tu
How does JVM handle locks
As we are talking about the latest version of Sun Hotspot Java Virtual Machine 1.6 there're the following three types of locks performed by JVM when you try to acquire lock from java.util.concurrent.locks.Lock implementation or enter synchronized blo
