Rule Definition
Every field of a serializable class must be either serializable or transient. Declaring non-transient fields of non-serializable type inside of a serializable class will result in an exception thrown during the serialization.

Remediation
Make the field type serializable or transient.

Violation Code Sample

public static  final class  SomeType {}

public class SerializableField implements Serializable {
    private String str;
    private SomeType field; // VIOLATION
}

Fixed Code Sample

---> 1st solution
public static  final class  SomeType implements Serializable {} // FIXED

public class SerializableField implements Serializable {
    private String str;
    private SomeType field;
}

---> 2nd solution
public static  final class  SomeType {} 

public class SerializableField implements Serializable {
    private String str;
    private transient SomeType field; // FIXED
}

please refer to Pattern definition of ASCRM-RLB-2: Serializable Storable Data Element without Serialization Control Element in http://www.omg.org/spec/ASCRM/1.0/PDF