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Joshua Bloch \[[Bloch 2008|AA. Bibliography#Bloch 08]\] suggests implementing a {{stop()}} method explicitly such that it leaves the class in an unusable state beyond its lifetime. A {{private}} field within the class can signal whether the class is unusable. All the class methods must check this field prior to operating on the class. This is akin to [the first exception|OBJ11-J. Prevent access to partially initialized objects#OBJ04-EX1] discussed in rule [OBJ11-J. Prevent access to partially initialized objects]. As always, a good place to call the termination logic is in the {{finally}} block.

Exceptions

MET18MET12-EX0: Finalizers may be used when working with native code because the garbage collector cannot reclaim memory used by code written in another language and because the lifetime of the object is often unknown. Again, the native process must not perform any critical jobs that require immediate resource deallocation.

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Rule

Severity

Likelihood

Remediation Cost

Priority

Level

MET18 MET12-J

medium

probable

medium

P8

L2

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[[MITRE 2009

AA. Bibliography#MITRE 09]]

[CWE ID 586

http://cwe.mitre.org/data/definitions/586.html] "Explicit Call to Finalize()", [CWE ID 583

http://cwe.mitre.org/data/definitions/583.html] "finalize() Method Declared Public"

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CWE ID 568 "finalize() Method Without super.finalize()"

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[[API 2006

AA. Bibliography#API 06]]

[finalize()

http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html#finalize()]

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[[Bloch 2008

AA. Bibliography#Bloch 08]]

Item 7, Avoid finalizers

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[[Boehm 2005

AA. Bibliography#Boehm 05]]

 

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[[Coomes 2007

AA. Bibliography#Coomes 07]]

"Sneaky" Memory Retention

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[[Darwin 2004

AA. Bibliography#Darwin 04]]

Section 9.5, The Finalize Method

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[[Flanagan 2005

AA. Bibliography#Flanagan 05]]

Section 3.3, Destroying and Finalizing Objects

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[[JLS 2005

AA. Bibliography#JLS 05]]

Section 12.6, Finalization of Class Instances

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