Serializable non-static inner class without 'serialVersionUID'

Reports non-static inner classes that implement java.io.Serializable, but do not define a serialVersionUID field.

Without a serialVersionUID field, any change to the class will make previously serialized versions unreadable. It is strongly recommended that Serializable non-static inner classes have a serialVersionUID field, otherwise the default serialization algorithm may result in serialized versions being incompatible between compilers due to differences in synthetic accessor methods.

A quick-fix is suggested to add the missing serialVersionUID field.

Example:

class Outer {
    class Inner implements Serializable {}
}

After the quick-fix is applied:

class Outer {
    class Inner implements Serializable {
        private static final long serialVersionUID = -7004458730436243902L;
    }
}

Use the following options to configure the inspection:

List classes whose inheritors should not be reported by this inspection. This is meant for classes that inherit Serializable from a superclass but are not intended for serialization.
Whether to ignore Serializable anonymous classes.

Inspection options

Option	Type	Default
Ignore subclasses of	StringList	[java.awt.Component]
Ignore anonymous inner classes	Checkbox	false

Inspection Details
Available in:	IntelliJ IDEA 2023.3, Qodana for JVM 2023.3
Plugin:	Java, 233.SNAPSHOT

Last modified: 13 July 2023