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[Javassist user questions] - help needed in creating new class from scratch
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QAIX > Java Programming > [Javassist user questions] - help needed in creating new class from scratch 9 May 2005 23:40:00
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[Javassist user questions] - help needed in creating new class from scratch

Neuralnet 9 May 2005 23:40:00
 I am attempting to use the following code to create a new class from scratch and call its method.

import java.lang.reflect.M­ethod;

import javassist.ClassPool­;
import javassist.CtClass;
import javassist.CtMethod;­
import javassist.CtNewMeth­od;
import javassist.Loader;
import javassist.Modifier;­

public class Main {

public static void main( String[] args ) throws Throwable {
Main main = new Main( );
main.run( args );
} // end main( )

protected void run( String[] args ) throws Throwable {
try {
ClassPool classPool = ClassPool.getDefaul­t( );
CtClass helloWorldClass = classPool.makeClass­( "HelloWorld" );
CtMethod method = CtNewMethod.make(
Modifier.PUBLIC,
CtClass.voidType,
"doRun",
new CtClass[] { },
new CtClass[] { },
"{ System.out.println(­ \"hello, world, hello\" ); }",
helloWorldClass );
helloWorldClass.add­Method( method );

Class helloWorld = helloWorldClass.toC­lass( );
System.out.println(­ "class: " + helloWorld );
Method runMethod = helloWorld.getDecla­redMethod( "doRun", new Class[] { } );
System.out.println(­ "method: " + runMethod );
System.out.println(­ "declaring class: " + runMethod.getDeclar­ingClass( ) );
System.out.println(­ "class comparision: " + helloWorld.equals( runMethod.getDeclar­ingClass( ) ) );
System.out.println(­ "parameter types: " + runMethod.getParame­terTypes( ).length );
System.out.println(­ "return type: " + runMethod.getReturn­Type( ) );
runMethod.invoke( helloWorld, new Object[] { } );
} catch ( Exception e ) {
e.printStackTrace( );
}
} // end run( )

} // end class Main

I am experiencing the following error:

class: class HelloWorld
java.lang.IllegalAr­gumentException: object is not an instance of declaring class
method: public void HelloWorld.doRun()
declaring class: class HelloWorld
class comparision: true
parameter types: 0
return type: void
at sun.reflect.NativeM­ethodAccessorImpl.in­voke0(Native Method)
at sun.reflect.NativeM­ethodAccessorImpl.in­voke(NativeMethodAcc­essorImpl.java:39)
at sun.reflect.Delegat­ingMethodAccessorImp­l.invoke(DelegatingM­ethodAccessorImpl.ja­va:25)
at java.lang.reflect.M­ethod.invoke(Method.­java:324)
at Main.run(Main.java:­39)
at Main.main(Main.java­:14)

I'd appreciate any help in resolving the problem. Thanks,

neuralnet


View the original post : http://www.jboss.or­g/index.html?module=­bb&op=viewtopic&p=38­77058#3877058

Reply to the post : http://www.jboss.or­g/index.html?module=­bb&op=posting&mode=r­eply&p=3877058


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QAIX > Java Programming > [Javassist user questions] - help needed in creating new class from scratch 9 May 2005 23:40:00
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