Hi ,
I think this question has already been asked on this mailing list
but I could not find satisfactory answer.. So here is my problem...
I am trying to use LTW using command line aj script as follows :
I have
* Aspect file : TraceAspect.aj *
public aspect TraceAspect {
pointcut trace()
: call (* *.printH*(..));
before() : trace() {
System.out.println("Printing from aspects : hello...................");
}
}
* java file : Hello.java *
public class Hello{
int i;
String s;
Hello()
{
this.i=0;
this.s="";
}
public void printHello()
{
System.out.println("hello from printHello" );
}
}
*Main.java :*
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/**
*
* @author lnvidyad
*/
public class Main {
public static void main(String[] args) {
ClassLoader classLoader = ClassLoader.getSystemClassLoader();
System.out.println("my loader " + classLoader.toString() );
try {
//load class...
Class myClass = classLoader.loadClass("hello");
System.out.println("Class loaded:" + myClass.getName());
//get the array of methods...
Method m[] = myClass.getMethods();
//make object...
Object p = null;
try {
//actually, make object here...
p = myClass.newInstance();
try {
//invoke the first method...
m[0].invoke(p,null);
} catch (IllegalAccessException ex) {
ex.printStackTrace();
} catch (IllegalArgumentException ex) {
ex.printStackTrace();
} catch (InvocationTargetException ex) {
ex.printStackTrace();
}
} catch (InstantiationException ex) {
ex.printStackTrace();
} catch (IllegalAccessException ex) {
ex.printStackTrace();
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
}
basically i want to use WeavingURLClassLoader at runtime to load my classes
just like URLCLassLoader
So , I did following steps: (all files in same directory)
1. ajc TraceAspect.java -outjar tracelib.jar
2. ajc Hello.java
3. ajc Main.java
4. set ASPECTPATH=tracelib.jar
5. aj Hello
Since aj replaces system classloader with WeavingURLCLassLoader, when I load
Hello class it should also perform weaving of TraceAspect
However, TraceAspect is not getting woven and hence I am not able to print
message from TraceAspect...
1. Can someone please explain me what is the problem ?
2 .What is the alternate way of using WeavingURLClassLoader at runtime ?
Thanks
Regards,
Atharva
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