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This noncompliant example shows a bug in Tomcat version 4.1.24, initially discovered by Reasoning \[[Reasoning 2003|AA. Bibliography#ReasoningReferences#Reasoning 03]\]. The {{cardinality}} method was designed to return the number of occurrences of object {{obj}} in collection {{col}}. One valid use of the {{cardinality}} method is to determine how many objects in the collection are {{null}}. However, because membership in the collection is checked using the expression {{obj.equals(elt)}}, a null pointer dereference is guaranteed whenever {{obj}} is {{null}} and {{elt}} is not {{null}}. |
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Null pointer dereferences can happen in path-dependent ways. Limitations of automatic detection tools can require manual inspection of code \[[Hovemeyer 2007|AA. Bibliography#HovemeyerReferences#Hovemeyer 07]\] to detect instances of null pointer dereferences. Annotations for method parameters that must be non-null can reduce the need for manual inspection by assisting automated null pointer dereference detection; use of these annotations is strongly encouraged. |
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Java Web Start applications and applets particular to JDK version 1.6, prior to update 4, were affected by a bug that had some noteworthy security consequences. In some isolated cases, the application or applet's attempt to establish an HTTPS connection with a server generated a {{NullPointerException}} \[[SDN 2008|AA. Bibliography#SDNReferences#SDN 08]\]. The resulting failure to establish a secure HTTPS connection with the server caused a denial of service. Clients were temporarily forced to use an insecure HTTP channel for data exchange. |
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<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="b6084c71d4b69921-230d7257-40f74999-94739eec-adecca5c1059f771e9e80069"><ac:plain-text-body><![CDATA[ | [ISO/IEC TR 24772:2010 | http://www.aitcnet.org/isai/] | Null Pointer Dereference [XYH] | ]]></ac:plain-text-body></ac:structured-macro> |
CWE-476. NULL pointer dereference |
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<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="3ae840c56c7dca7c-53c85add-442d4a64-bedca74d-52faba532b994b6b2dbc51b8"><ac:plain-text-body><![CDATA[ | [[API 2006 | AA. Bibliography#API References#API 06]] | [Method | http://java.sun.com/javase/6/docs/api/java/security/AccessController.html#doPrivileged(java.security.PrivilegedAction)] | ]]></ac:plain-text-body></ac:structured-macro> |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="176f169a3418fcbd-28c264e0-46f348f4-ab918ba2-2c78fcfed0ae3ef0cd798ab9"><ac:plain-text-body><![CDATA[ | [[Hovemeyer 2007 | AA. Bibliography#Hovemeyer References#Hovemeyer 07]] |
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<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="a4b3d5ff1891a769-ec45c527-4d3e4ff2-a0e681f3-493c2f74deb4c5589ae69c1b"><ac:plain-text-body><![CDATA[ | [[Reasoning 2003 | AA. Bibliography#Reasoning References#Reasoning 03]] | Defect ID 00-0001 | ]]></ac:plain-text-body></ac:structured-macro> | |
| Null Pointer Dereference | ||||
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="238d95d64a6e2f1b-2cc80d22-46a546b4-a6f3b365-1507fc2c163c6abed3c3ee4a"><ac:plain-text-body><![CDATA[ | [[SDN 2008 | AA. Bibliography#SDN References#SDN 08]] | [Bug ID 6514454 | http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6514454] | ]]></ac:plain-text-body></ac:structured-macro> |
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