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Editorial Team
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Asked: 2026-05-19T01:31:57+00:00

If I have an instance of a class that I store in a session

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If I have an instance of a class that I store in a session I need to make it serializable. This class has a static variable, will this be serialized in every instance stored?

The static variable is a reference to a cache containing a lot of data in the background. Will all of this data be serialized? If so, it seems preferable to make this variable transient and re-fetch the cache instance each time the instance is restored. Maybe not store the cache instance at all in the class.

Will the constructor execute when a class is restored from a serialized state? if not is there any other method I can use to re-instate a transient variable?

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  1. Editorial Team

    This class has a static variable, will
    this be serialized in every instance
    stored?

    No. According to the Java Object Serialization Specificaiton: “Default serializable fields of a class are defined to be the non-transient and non-static fields.”

    Will the constructor execute when a class is restored from a serialized state?

    No. Deserialization bypasses constructors (unless you have a non-serializable superclass).

    if not is there any other method I can use to re-instate a transient variable?

    You can use the readObject() method for that, as described in the Serializable API doc.

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