What is an optimistic locking ?

Interview Questions and Answers

Q1. What is an optimistic locking ?

Ans. It's the way for synchronization wherein we can store version information in the table , so that if the same entity is updated by two transactions, the last to commit changes is informed of the conflict, and does not override the other transaction's work.

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Related Questions

What is a BlockingQueue?

What is the difference between these two approaches of creating singleton Class ?

//Double Checked Locking Code
public static Singleton createInstance() {
   if(singleton == null){
      synchronized(Singleton.class) {
         if(singleton == null) {
            singleton = new Singleton();
         }
      }
   }
   return singleton;
}

//Single checked locking code
public static Singleton createInstance() {
   synchronized(Singleton.class) {
      if(singleton == null) {
         singleton = new Singleton();
      }
   }
   return singleton;
}

What could be the possible cause for following exception ?

org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect):

What could be the way to fix it ?

What is a BlockingQueue ?

Can the double checked locking fail on single processor system ?

Implement a thread-safe (blocking) queue

What is the difference between subscribe and blockingSubscribe method ?

What is optimistic and pessimistic locking ?

How to build a blocking queue ?

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