Pattern: serialPersistentFields is not private, static, and final
Issue: -
To use a Serializable object's serialPersistentFields correctly, it must be declared private, static, and final.
The Java Object Serialization Specification allows developers to manually define Serializable fields for a class by specifying them in the serialPersistentFields array. This feature will only work if serialPersistentFields is declared as private, static, and final. Also, specific to Groovy, the field must be of type ObjectStreamField[], and cannot be Object.
Example of violations:
class SomeClass implements Serializable {
public ObjectStreamField[] serialPersistentFields = [ new ObjectStreamField("someField", List.class) ] as ObjectStreamField[]
}
// the JVM sees the field type as Object, which won't work
class SomeOtherClass implements Serializable {
private static final serialPersistentFields = [ new ObjectStreamField("someField", List.class) ] as ObjectStreamField[]
}