Code Generation FAQ
How do I install asm in eclipse ?
The first thing you need to do is download asm-3.1.jar from asm.objectweb.org
and add it to your project's buildpath. There are several ways to do
this--try rightclicking on your project and selecting "add
external archive". Then browse to and select the jar file,
etc. After you do this, SimpleImageDemo should work.
To have the bytecode viewer and "asmifier" available, you
need to download the eclipse plugins. From the Help menu across
the top, select "Software Updates". Then select
"Available Software". Add the update site http://andrei.gmxhome.de/eclipse,
select the appropriate plugin for whatever version of eclipse you are
using, and click install. When this is done, you should be able to
open a bytecode viewer window by going to the "Window" menu,
select "Show view" and "ByteCode". You might
have to select "Other" before you see "ByteCode".
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How do I set the classpath?
Java uses the classpath to know where to look for class and jar
files. First, find the complete paths to the directories containing
the classfiles or jar file you need and add these to your classpath.
You can do this permanently (go to control panel-->
system-->advanced-->environment variables) or explicitly
give it on the command line every time--something like
java -classpath .;c:\the\path\to\dir0;c:\xxx.jar test1
image0.jpg
. is the current directory
entries in the list are separated by ;
java -help
gives you info about all the command line options for java.
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What if I'm not using eclipse?
I'm not aware of asm plugins for other IDEs. However, you really only need two things, neither of which require eclipse. First, you want to be able to look at the bytecode. You can do this with javap. Second, it is sometimes helpful to see "asmified" code. The org.objectweb.asm.util.ASMifierClassVisitor class will show you this. It contains a main method that takes a class file as a command line parameter and print the asmified code to the console.
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