Let say we have a class ABC that implements Serializable

interface, but it contains a member variable object of class XYZ

that does not implement Serializable interface. Due to this it is not

possible to Serialize the class ABC.

To solve this issue, we can mark the member variable XYZ as

Transient in class ABC. This will allow us to serialize the class

ABC.

https://www.baeldung.com/java-transient-keyword