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Circuit breaker implementation in Java: The service A calls service B and service C every time. If one service fails 3-times in 10 minutes ( or 20 seconds in the implementation) the next call will be blocked for 5 minutes (10 seconds in the implementation). There was given a simulation of remote method calls, I needed to implement only the execute() which calls the remote service if possible.
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Senior Backend Java Engineer

Interviewed at Wise

3.6★
Feb 19, 2026

Circuit breaker implementation in Java: The service A calls service B and service C every time. If one service fails 3-times in 10 minutes ( or 20 seconds in the implementation) the next call will be blocked for 5 minutes (10 seconds in the implementation). There was given a simulation of remote method calls, I needed to implement only the execute() which calls the remote service if possible.

What is exception? when should occur NullPointer exception?write a program for NullPointerException? explain about singleton design pattern? Write a thread safe Singleton class. can we write a class in scriptlet? Expalain abou Hashset?
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Java Developer

Interviewed at Dell Technologies

3.7★
Jul 23, 2016

What is exception? when should occur NullPointer exception?write a program for NullPointerException? explain about singleton design pattern? Write a thread safe Singleton class. can we write a class in scriptlet? Expalain abou Hashset?

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