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public static BigInteger safeInstance(BigInteger val) { // create a defensive copy if it is not java.math.BigInteger if (val.getClass() != java.math.BigInteger.class) return new BigInteger(val.toByteArray()); return val; } |
The rules "FIO00-J. Defensively copy mutable inputs and mutable internal components" and "OBJ08-J. Provide mutable classes with copy functionality to allow passing instances to untrusted code safely" discuss defensive copying in great depth.
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<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="8e098d4d7b2b0bf0-a41477cd-43434424-9af2a70f-e47d47387b15fa85be89df6b"><ac:plain-text-body><![CDATA[ | [[API 2006 | AA. Bibliography#API 06]] | Class BigInteger | ]]></ac:plain-text-body></ac:structured-macro> |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="10fc735a54b1495c-b2b36a12-47a2448c-aaf39d1e-5150af100f2bd5dfe65ba936"><ac:plain-text-body><![CDATA[ | [[Bloch 2008 | AA. Bibliography#Bloch 08]] | Item 1: "Consider static factory methods instead of constructors" | ]]></ac:plain-text-body></ac:structured-macro> |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="990ded4fbfe09942-580b1b09-45634dfc-a5eab067-1d3a36758004eceea3213bbc"><ac:plain-text-body><![CDATA[ | [[Gong 2003 | AA. Bibliography#Gong 03]] | Chapter 6: "Enforcing Security Policy" | ]]></ac:plain-text-body></ac:structured-macro> |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="c85d5f4339e82cf6-e934d679-4d38424a-8ac88028-e52a537ad4746e830b313877"><ac:plain-text-body><![CDATA[ | [[Lai 2008 | AA. Bibliography#Lai 08]] | Java Insecurity: Accounting for Subtleties That Can Compromise Code | ]]></ac:plain-text-body></ac:structured-macro> |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="391d5b018a4b8d10-84f4008a-40b94071-8fbd9654-7a779fc970f341022bee5f25"><ac:plain-text-body><![CDATA[ | [[McGraw 1999 | AA. Bibliography#McGraw 99]] | Chapter Seven Rule 3: "Make Everything Final, Unless There's a Good Reason Not To" | ]]></ac:plain-text-body></ac:structured-macro> |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="1376cf0a3f6e6bb7-2bd19297-42054b27-bcaf8839-fd1bc2c43220d39461c06207"><ac:plain-text-body><![CDATA[ | [[SCG 2007 | AA. Bibliography#SCG 07]] | Guideline 1-2 "Limit the extensibility of classes and methods" | ]]></ac:plain-text-body></ac:structured-macro> |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="ccfc5b7d2d65bf9c-929c3b31-4dfc426b-a18fb3f5-c2ab583cf949f17b9a25b46a"><ac:plain-text-body><![CDATA[ | [[SCG 2009 | AA. Bibliography#SCG 09]] | Secure Coding Guidelines for the Java Programming Language, version 3.0 | ]]></ac:plain-text-body></ac:structured-macro> |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="e850ebdc4db6df5e-71312f96-4e2540d4-a99fbf76-32e5ec6b1fbe4efe249689f3"><ac:plain-text-body><![CDATA[ | [[Ware 2008 | AA. Bibliography#Ware 08]] | ]]></ac:plain-text-body></ac:structured-macro> |
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