CODEWITHSUNDEEP
javaaspectj
devoured elysium
devoured elysium

Reputation: 105077

Issues when attempting to compile AspectJ tutorial application

I was trying to follow this tutorial:

http://andrewclement.blogspot.pt/2009/02/load-time-weaving-basics.html

but I stumbled across a couple of problems:

To start with, my system didn't have the javac and ajc PATH variables set, so I added the bin/ directory of my JDK7 to the PATH variable, as well as AspectJ's bin/ directory.

But when running ajc WhereDoesTheTimeGo.java Simple.java I got the following error:

[warning] couldn't find aspectjrt.jar on classpath, checked: C:\Program Files\Ja
va\jre7\lib\resources.jar;C:\Program Files\Java\jre7\lib\rt.jar;C:\Program Files
\Java\jre7\lib\sunrsasign.jar;C:\Program Files\Java\jre7\lib\jsse.jar;C:\Program
 Files\Java\jre7\lib\jce.jar;C:\Program Files\Java\jre7\lib\charsets.jar;C:\Prog
ram Files\Java\jre7\lib\jfr.jar;C:\Program Files\Java\jre7\classes;C:\Program Fi
les\Java\jre7\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jre7\lib\ext\dn
sns.jar;C:\Program Files\Java\jre7\lib\ext\jaccess.jar;C:\Program Files\Java\jre
7\lib\ext\localedata.jar;C:\Program Files\Java\jre7\lib\ext\sunec.jar;C:\Program
 Files\Java\jre7\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jre7\lib\ext\
sunmscapi.jar;C:\Program Files\Java\jre7\lib\ext\zipfs.jar;C:\Program Files\Java
\jre7\lib\tools.jar

[error] classpath error: unable to find org.aspectj.lang.JoinPoint (check that a
spectjrt.jar is in your classpath)

so I manually added the referred file to the classpath:

ajc -cp ajc -cp C:\aspectj1.7\lib\aspectjrt.jar Simple.java WhereDoesTheTimeGo.java

and then execution went apparently alright, being both .class files created. But then...:

ajtests>java Simple
Exception in thread "main" java.lang.NoClassDefFoundError: org/aspectj/lang/Sign
ature
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
        at java.lang.Class.getMethod0(Unknown Source)
        at java.lang.Class.getMethod(Unknown Source)
        at sun.launcher.LauncherHelper.getMainMethod(Unknown Source)
        at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.aspectj.lang.Signature
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        ... 6 more

so I once again added AspectJ's jars to the classpath:

java -cp C:\aspectj1.7\lib\aspectjrt.jar;C:\aspectj1.7\lib\aspectjtools.jar;C:\aspectj1.7\lib\aspectjweaver.jar;C:\aspectj1.7\lib\org.aspectj.matcher.jar Simple

But that will only yield

Error: Could not find or load main class Simple

What's going wrong here? Why is this giving me so much pain than what the tutorials would make me believe I'd have to have?

EDIT

I've noticed I only have to write

aj -cp .;;C:\aspectj1.7\lib\aspectjweaver.jar Simple

and that will work. What I'm finding strange is that aspectjweaver.jar seems to be already being passed on by the aj script:

@echo off
REM This file generated by AspectJ installer
REM Created on Tue Apr 16 19:02:36 BST 2013 by top_secret

if "%JAVA_HOME%" == "" set JAVA_HOME=C:\Program Files\Java\jre7
if "%ASPECTJ_HOME%" == "" set ASPECTJ_HOME=c:\aspectj1.7

if exist "%JAVA_HOME%\bin\java.exe" goto haveJava
if exist "%JAVA_HOME%\bin\java.bat" goto haveJava
if exist "%JAVA_HOME%\bin\java" goto haveJava
echo java does not exist as %JAVA_HOME%\bin\java
echo please fix the JAVA_HOME environment variable
:haveJava
"%JAVA_HOME%\bin\java" -classpath "%ASPECTJ_HOME%\lib\aspectjweaver.jar" "-Djava.system.class.loader=org.aspectj.weaver.loadtime.WeavingURLClassLoader" "-Daj.class.path=%ASPECTPATH%;%CLASSPATH%" "-Daj.aspect.path=%ASPECTPATH%" %*

Any clue?

Upvotes: 3

Views: 4597

Answers (1)

Perception
Perception

Reputation: 80603

Try this instead, for your java command:

java -cp .;C:\aspectj1.7\lib\aspectjrt.jar;C:\aspectj1.7\lib\aspectjtools.jar;C:\aspectj1.7\lib\aspectjweaver.jar;C:\aspectj1.7\lib\org.aspectj.matcher.jar Simple

You need to include the current directory (where you are compiling your source files to) in the classpath.

Upvotes: 5

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