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This compliant solution both avoids the possibility of incorrect serialization and protects sensitive data members from accidental serialization by declaring the relevant members as transient so that they are omitted from the list of fields to be serialized by the default serialization mechanism.

Code Block

bgColor	#ccccff

public class Point {
public class Point {
 private transient double x; // declared transient
 private transient double y; // declared transient

 public Point(double x, double y) {
  this.x = x;
  this.y = y;
 }

 public Point() {
   // no-argument constructor
 }
}

public class Coordinates extends Point implements Serializable {
  public static void main(String[] args) {
    try {
      Point p = new Point(5,2);
      FileOutputStream fout = new FileOutputStream("point.ser");
      ObjectOutputStream oout = new ObjectOutputStream(fout);
      oout.writeObject(p);
      oout.close();
    } catch (Exception e) {
      // Forward to handler
    } finally {
      if (fout != null) {
        try {
          fout.close();
        } catch (IOException x) {
          // handle error
        }
      }
    }
  }
}

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<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="ac84ff752d56f57b-0e27c742-46974dcc-ab959559-de04a5f42e1c38ee2e27cd73"><ac:plain-text-body><![CDATA[	[[Bloch 2005	AA. References#Bloch 05]]	Puzzle 83. Dyslexic monotheism	]]></ac:plain-text-body></ac:structured-macro>
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="4300c562b4602fde-0b8c009c-4154408c-8555b54e-4f84c1123b975b921e3798b0"><ac:plain-text-body><![CDATA[	[[Bloch 2001	AA. References#Bloch 01]]	Item 1. Enforce the singleton property with a private constructor	]]></ac:plain-text-body></ac:structured-macro>
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="926482ebc2889205-64676dd0-4ab544f6-b4bfb034-038fa6752308c62b23bc4977"><ac:plain-text-body><![CDATA[	[[Greanier 2000	AA. References#Greanier 00]]	[Discover the Secrets of the Java Serialization API	http://java.sun.com/developer/technicalArticles/Programming/serialization/]	]]></ac:plain-text-body></ac:structured-macro>
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="2e50266ba083a600-2477f30c-48dc40ec-a0e4b7ed-da0b1c48c40eb31e4333eddf"><ac:plain-text-body><![CDATA[	[[Harold 1999	AA. References#Harold 99]]		]]></ac:plain-text-body></ac:structured-macro>
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="a891cc9790c510e3-cf3dcb26-4ff8449d-ad518724-dfa2ae60a4ed309dc590896e"><ac:plain-text-body><![CDATA[	[[JLS 2005	AA. References#JLS 05]]	[Transient Modifier	http://java.sun.com/docs/books/jls/third_edition/html/classes.html#37020]	]]></ac:plain-text-body></ac:structured-macro>
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="0e207ef249d5e808-c609cfc5-4adb47c8-ae7791aa-b095f3dfda09fad08a207dbc"><ac:plain-text-body><![CDATA[	[[Long 2005	AA. References#Long 05]]	Section 2.4, Serialization	]]></ac:plain-text-body></ac:structured-macro>
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="bfd2eace0c2147cb-d8e6d9ae-4adb415f-9a3f963d-85cfc1e27bf703b1cb04e0d6"><ac:plain-text-body><![CDATA[	[[Sun 2006	AA. References#Sun 06]]	Serialization Specification, A.4, Preventing Serialization of Sensitive Data	]]></ac:plain-text-body></ac:structured-macro>

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