Java, 58 bytes

l->l.stream().map(x->java.util.Collections.frequency(l,x)) 

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Java, 58 bytes

l->l.stream().map(x->java.util.Collections.frequency(l,x)) 

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Java, 56 bytes

l->l.stream().map(x->l.stream().filter(y->y==x).count()) 

This only works for integers in the Integer Cache (-128 to 127, by default).

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