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What is the attribute of java bean to specify scope of bean to have single instance per Spring IOC?

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What is the attribute of java bean to specify scope of bean to have single instance per Spring IOC?

(a) prototype

(b) singleton

(c) request

(d) session

I had been asked this question at a job interview.

The question is from Java Beans in division Java Beans & JDBC of Java

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Correct option is (b) singleton

Explanation: Singleton scope of bean specifies only one instance per spring IOC container. This is the default scope.

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