[jboss-user] [Javassist] - mapping of parameter and generic parameter types

[Kalle Richter]

Kalle Richter [https://community.jboss.org/people/krichter] created the discussion

"mapping of parameter and generic parameter types"

To view the discussion, visit: https://community.jboss.org/message/749365#749365

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Hallo together,
I'm wondering whether the length of the arrays returned by java.lang.reflect.Constructor.getParameterTypes() and getGenericParameterTypes() should be always equal, i.e. whether it's a bug if they're not or whether I'm doing something wrong. You can run the program below and you'll understand my problem immediately  :)  

package org.h9t2.javassistbug;
 
import java.io.*;
import java.util.List;
import java.util.Set;
import javassist.*;
 
public class App {
    private final static ClassPool pool = ClassPool.getDefault();
 
    public static void main( String[] args ) throws NotFoundException, IOException, CannotCompileException 
{        
        CtClass ctClass1 = pool.get(Clazz.class.getName());
        CtClass clone1 = createClone(ctClass1);
        CtConstructor cloneConstructor1 = clone1.getConstructors()[0];
        cloneConstructor1.addParameter(pool.get(List.class.getName()));
        cloneConstructor1.addParameter(pool.get(Set.class.getName()));
        Class clazz1 = clone1.toClass();
        
        System.out.println(clazz1.getConstructors()[0].getParameterTypes().length);
        System.out.println(clazz1.getConstructors()[0].getGenericParameterTypes().length);
  }
        
    private static int classNameSuffix = 1;
        
    private static CtClass createClone(CtClass ctClass) throws IOException {
        ByteArrayOutputStream classFileByteStream =new ByteArrayOutputStream();
        DataOutputStream classFileStream = new DataOutputStream(classFileByteStream);
        if(ctClass.isFrozen()) {
            ctClass.defrost();
        }
        ctClass.getClassFile().write(classFileStream);
        byte[] classFileBytes = classFileByteStream.toByteArray();
        InputStream classFileCloneStream = new ByteArrayInputStream(classFileBytes);
        CtClass retValue = pool.makeClass(classFileCloneStream);
        retValue.setName(ctClass.getName()+"V"+classNameSuffix++);
        return retValue;
    }
}
 
class Clazz {
 
    public Clazz(
        List<Boolean> parameter0,
        int b
    ) {}
}
 


Or is it the fault of my createClone method?

Any help or hint is appreciated

Best regards
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