Using static and non static synchronized method for protecting shared resource is another Java mistake we are going to discuss in this part of our series “learning from mistakes in Java”. In last article we have seen why double and float should not be used for monetary calculation , In this tutorial we will find out why using static and non static synchronized method together for protecting same shared resource is not advisable.
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I have seen some times Java programmer mix static synchronized method and instance synchronized method to protect same shared resource. They either don't know or failed to realize that static synchronized and non static synchronized method lock on two different object which breaks purpose of synchronizing shared resource as two thread can concurrently execute these two method breaking mutual exclusive access, which can corrupt status of mutable object or even cause subtle race condition in Java or even more horrible deadlock in java.
