[ACCEPTED]-Singleton and Exception-singleton

Accepted answer

Score: 37

Use a static initializer and rethrow the 8 Exception as ExceptionInInitializerError. Click the link to read the Javadoc, you'll 7 see that it suits exactly for this particular 6 functional requirement: handling exceptions 5 during static initialization. A singleton is in fact nothing 4 less or more than a statically and lazily 3 initialized global object.

private static class SingletonObjectFactoryHolder{
    private static final ObjectFactory INSTANCE;
    static {
        try {
            INSTANCE = new ObjectFactory();
        } catch (Exception e) {
            throw new ExceptionInInitializerError(e);
        }
    }
}

No need for double checked locking idiom 2 which is considered an anti-pattern and 1 in some circumstances even unsafe.

Source: stackoverflow.com

Other Ways of Singleton in Java

Making a class singleton without using static method

Thread safe multitons in Java

Singleton class with several different classloaders

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Creating a factory that returns singletons

Ever need to destroy a singleton instance?

Spring singleton created multiple times

concurrent calls of singleton class methods

Setting Singleton property value in Firebase Listener

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