Changes

== Real-life Application Applications ==

=== Apache Excalibur===

The following are portions of the code found in [http://www.google.com/codesearch?hl=en&q=show:b65X65FJv3k:tIVs6rnDDGE:CuwdO4_VJq8&sa=N&ct=rd&cs_p=https://svn.apache.org/repos/asf/excalibur/trunk/&cs_f=framework/api/src/test/org/apache/avalon/framework/test/CascadingErrorTestCase.java|[CascadingErrorTestCase.java ]] and [http://www.google.com/codesearch?hl=en&q=show:5CjVErg7uPw:tIVs6rnDDGE:W66LfbDC3n0&sa=N&ct=rd&cs_p=https://svn.apache.org/repos/asf/excalibur/trunk/&cs_f=framework/api/src/test/org/apache/avalon/framework/test/CascadingExceptionTestCase.java|[CascadingEexceptionTestCase.java ]] files.<br/><br/>

Source from [http://www.google.com/codesearch?hl=en&q=show:tIVs6rnDDGE:QLDR0Cw82Lo&sa=N&ct=rdl&cs_p=https://svn.apache.org/repos/asf/excalibur/trunk/&cs_f=framework/api/src/test/org/apache/avalon/framework/test/|Apache Excalibur Test Framework via Google Code Search] === Apache Tomcat === The following are portions of the code found in [https://svn.apache.org/repos/asf/tomcat/connectors/trunk/jk/java/org/apache/jk/common/Shm.java[Shm.java]] and[https://svn.apache.org/repos/asf/tomcat/connectors/trunk/jk/java/org/apache/jk/common/Shm14.java[Shm14.java]]<br/><br/>Looking at the '''Shm14.java''', we can conclude that '''Shm.java''' is the base class while ''''Shm14.java'''' is the subclass. In addition, ''''Shm.java''' also extends to '''JniHandler''', making it a subclass of that class.<pre>// From Shm14.javapublic class Shm14 extends Shm {}</pre><pre>// From Shm.javapublic class Shm extends JniHandler {}</pre>From the file '''Shm.java''', the following method is given. <pre> public int invoke(Msg msg, MsgContext ep ) throws IOException { if( apr==null ) return 0; log.debug("ChannelShm.invoke: " + ep ); super.nativeDispatch( msg, ep, JK_HANDLE_SHM_DISPATCH, 0 ); return 0; } </pre>In the ''''Shm14.java'''' file, the method from the base class is overridden with the following new one - its implementation changed, but the same structure.<pre> public int invoke(Msg msg, MsgContext ep ) throws IOException { if (log.isDebugEnabled()) log.debug("ChannelShm14.invoke: " + ep );  // return 0; } </pre>Source from [https://svn.apache.org/repos/asf/tomcat/connectors/trunk/jk/java/org/apache/jk/common/ | Apache Tomcat Sample Code via Google Code Search]