Javadoc: how to get links to Java API with @see tags?

Hello guys, I'm a newbie in the IDEs world and I've started from Eclipse, then some mates redirected me to IntelliJ, which is way better.
Actually, I've just one thing that prevent me to abandon Eclipse and it's javadoc generation.
In Eclipse I've no problem in setting the Java API javadoc path, neither in IntelliJ.
The problem is that Eclipse, when making javadoc, links the @see tags at the online Java API; IntelliJ doesn't.
I mean,
In Eclipse: "@see BigDecimal" -> in javadoc
In IntelliJ it doesn't happen.
I've setted the Documentation URL to the correct one, so what I'm doing wrong?

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