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From Apache Wiki <wikidi...@apache.org>
Subject [Db-derby Wiki] Trivial Update of "DumpClassFile" by BryanPendleton
Date Wed, 15 Apr 2009 01:24:16 GMT
Dear Wiki user,

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The following page has been changed by BryanPendleton:
http://wiki.apache.org/db-derby/DumpClassFile

The comment on the change is:
Notes from Kathey and Rick

------------------------------------------------------------------------------
  
     {{{ java -Dderby.debug.true=DumpClassFile org.apache.derby.tools.ij }}}
  
-  * Reproduce the problem that you're interested in.
+  * Reproduce the problem that you're interested in. It's best if you can narrow the problem
down to a single statement that you can execute in your IJ session.
   * Exit IJ and look in your current directory. You'll see a file like:
  
     {{{ ac601a400fx0116x4ec6xd381x00000010e1180.class }}}
  
     This is the generated class file for the statement you just ran.
  
-  * Use a decompiler to transform the generated Java class into source code. I've been successful
using "jad".
+  * Use a decompiler to transform the generated Java class into source code. I've been successful
using "jad". Others have used {{{javap -c}}}. Still others have used 'jode' (see below).
   * Now you can read the code!
  
  Some other information about generated class files is documented here:
  http://db.apache.org/derby/javadoc/engine/org/apache/derby/impl/services/bytecode/BCJava.html
  
+ == A shell script for using the 'jode' decompiler ==
+ 
+ This shell script may prove useful if you are using the 'jode' decompiler to view the generated
class file's code:
+ 
+ {{{
+ #! /bin/bash
+ #
+ # Run the jode decompiler on a class. E.g.:
+ #
+ # runjode acf81e0010x011cxddd8xfcabx0000000feab00
+ 
+ classStub=$1
+ 
+ . setupClasspath
+ 
+ export CLASSPATH=$CLASSPATH:$SW/javaDecompilers/jode/jode-1.1.2-pre1.jar:.
+ 
+ echo $CLASSPATH
+ 
+ mkdir org
+ mkdir org/apache
+ mkdir org/apache/derby
+ mkdir org/apache/derby/exe
+ 
+ cp $classStub.class org/apache/derby/exe/
+ 
+ #java -cp $CLASSPATH jode.decompiler.Main --help $*
+ java -cp $CLASSPATH jode.decompiler.Main org.apache.derby.exe.$classStub
+ }}}
+ 

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