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Also see the related rule MET06-J. Do not invoke overridable methods in clone().

Noncompliant Code Example

This noncompliant code example invokes an overridable method from the readObject() method.

Code Block

bgColor	#FFCCCC

private void readObject(final ObjectInputStream stream) throws 
    IOException, ClassNotFoundException {
  overridableMethod(); 
  stream.defaultReadObject();
}

public void overridableMethod() {
  // ...
}

Compliant Solution

This compliant solution removes the call to the overridable method. When removing such calls is infeasible, ensure that the overridable method is declared private or final.

Code Block

bgColor	#ccccff

private void readObject(final ObjectInputStream stream) throws 
    IOException, ClassNotFoundException {
  stream.defaultReadObject();
}

Exceptions

Wiki Markup

*SER11-EX1:* "The {{readObject}} methods will often call {{java.io.ObjectInputStream.defaultReadObject}}, which is an overridable method" \[[SCG 2009|AA. Bibliography#SCG 09]\]. Such calls are permitted.

Risk Assessment

Invoking overridable methods from the readObject() method can lead to initialization errors.

Rule	Severity	Likelihood	Remediation Cost	Priority	Level
SER11-J	low	probable	medium	P4	L3

Related Vulnerabilities

Search for vulnerabilities resulting from the violation of this rule on the CERT website.

Bibliography

<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="6030da7a5974c5e0-e84d2ae5-407b472c-939695e0-1648477e0a55a4d83f294e95"><ac:plain-text-body><![CDATA[	[[API 2006	AA. Bibliography#API 06]]		]]></ac:plain-text-body></ac:structured-macro>
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="40ff23fbd9949543-148f1856-41254209-a2b2806a-a7ab692480153dbf0a5ff8b2"><ac:plain-text-body><![CDATA[	[[SCG 2009	AA. Bibliography#SCG 09]]	Guideline 4-4 Prevent constructors from calling methods that can be overridden	]]></ac:plain-text-body></ac:structured-macro>
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="fbfae026cf937110-20f9dab7-45a44195-8c9e88c9-ff7748aa2649224d931b29e5"><ac:plain-text-body><![CDATA[	[[Bloch 2008	AA. Bibliography#Bloch 08]]	Item 17: "Design and document for inheritance or else prohibit it"	]]></ac:plain-text-body></ac:structured-macro>

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