inexplicable Netbeans serializable warning for nested base class

Question

When I define the following class

public class Outer extends Outer.Inner { public static class Inner { } }

Netbeans 6.9.1 gives me the "has no definition of serialVersionUID" warning for both Outer and Inner. I'm wondering if there is a legit reason for this warning, or if it's a bug. What about extending an inner class makes the compiler think they are implementing Serializable?

Note: This is more out of curiosity than wanting this unnecessary design pattern.

Most curious. Perhaps the compiler isn't able to generate a serialVersionUID because class Inner is in the scope of Outer. — Daniel
– Daniel, Commented May 21, 2011 at 0:47
Eclipse 3.7 gives an error: Cycle detected: the type Outer cannot extend/implement itself or one of its own member types. — verdesmarald
– verdesmarald, Commented May 21, 2011 at 0:49
NetBeans 13 reports cyclic inheritance involving Outer and nothing regarding serialVersionUID. — Martin
– Martin, Commented May 12, 2022 at 12:20

joe · Accepted Answer · 2011-06-24 19:16:55Z

I've wondered the same thing myself. In lieu of an answer, I turned off the warning.

Tools -> Options Menu Hints Tab -> Standard Javac warnings Uncheck the serialization checkbox.

Now you'll have to be careful when extending Serialized Objects, but it stops annoying you about things that aren't serialized.

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