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The {{Provider}} class inherits the {{put()}} and {{remove()}} methods from {{Hashtable}} and adds security manager checks to each. These checks ensure that malicious code cannot add or remove the mappings. When {{entrySet()}} was introduced, it became possible for untrusted code to remove the mappings from the {{Hashtable}} because {{Provider}} did not override this method to provide the necessary security manager check \[[SCG 20072009|AA. Bibliography#SCG 0709]\]. This problem is commonly known as a "fragile class hierarchy" in other object-oriented languages, such as C++. |
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<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="b0d9bc68a4ea1054-582b85ef-44d643dd-9f95986a-f58b505dd32900e047b9b31f"><ac:plain-text-body><![CDATA[ | [[API 2006 | AA. Bibliography#API 06]] | [Class Calendar | http://download.oracle.com/javase/6/docs/api/java/util/Calendar.html] | ]]></ac:plain-text-body></ac:structured-macro> |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="49dac1b6f193cf34-660d4945-4bc54407-beeb9337-536c00cd54d3762d39a94529"><ac:plain-text-body><![CDATA[ | [[Bloch 2008 | AA. Bibliography#Bloch 08]] | Item 16: "Favor composition over inheritance" | ]]></ac:plain-text-body></ac:structured-macro> | |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="9c80aa6770816f3f-fbdda0c7-41aa485b-80fda6ee-21687a1c56baa5c137793c6d"><ac:plain-text-body><![CDATA[ | [[Gamma 1995 | AA. Bibliography#Gamma 95]] | Design Patterns: Elements of Reusable Object-Oriented Software | ]]></ac:plain-text-body></ac:structured-macro> | |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="e424bf49b70b00d4-851a67e2-48ea4e87-832c8139-7d3a78f5fc47fd9fb7669fe7"><ac:plain-text-body><![CDATA[ | [[Lieberman 1986 | AA. Bibliography#Lieberman 86]] | Using prototypical objects to implement shared behavior in object-oriented systems | ]]></ac:plain-text-body></ac:structured-macro> | |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="6fab60ecd0ff4384-3af5fecd-44b0469c-8b9496f1-4ca130f77f485d2d115bb545"><ac:plain-text-body><![CDATA[ | [[SCG 20072009 | AA. Bibliography#SCG 0709]] | Guideline 1-3 Understand how a superclass can affect subclass behavior | ]]></ac:plain-text-body></ac:structured-macro> |
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