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"An inner class is a nested class that is not explicitly or implicitly declared {{static}}." \[[JLS 05|AA. Java References#JLS 05]\]. Serialization of inner classes (including local and anonymous classes) is error prone. According to the Serialization Specification \[[Sun 06|AA. Java References#Sun 06]\]:

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Compliant Solution

This compliant solution recommends against discourages implementing the Serializable interface in the InnerSer class.

public class OuterSer implements Serializable {
  private int ssn;
  class InnerSer {
    protected String name;
    //...
  }
}

Compliant Solution

It is also allowable to declare the inner class as static to prevent its serialization.

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Attempts to serialize inner classes can cause instances of the outer class to be serialized and also discourage introduce platform independencedependencies.

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