Find path to offending non-Serializable member variable

Question

In Java, Serialization makes reading and writing objects to streams REALLY easy. For instance, the following code snippet is mostly all it takes to write objects to a strea

Answer 1

I had the same problem and I also implemented the crawler thing you talked about. If somebody is still interested in it, I presented the code here: A good way to find unserializable fields in Java

Answer 2

This is a strange question - you're wanting to determine at runtime what you should be doing at compile time. In theory, the path to the object shouldn't matter - you need to find the objects that reference things that aren't serializable to fix your code.

That said, you could write a simple recursive tree crawler using reflection. That said, you might be able to get away with implementing your own ObjectInputStream that logs the objects coming in appropriately. I recommend taking a look at the source for more detail

Answer 3

Pass the flag -Dsun.io.serialization.extendedDebugInfo=true to the JVM and it should give you exactly the information you want, when a NotSerializableException is thrown.