Nsryjdtyk

I'm trying to load class from classpath and then print informations about class while visiting with ClassVisitor. The challenge is the class which I'm intrested in is not loaded by instrumented application, so I have to load it by myself. First I'm looking for it on classpath and then invoking loader.loadClass but nothing specially happens. Could you guys tell me how to do it correctly? Everything works fine if I instantinate this class in instrumented app (then it gets loaded), I'm also sure the findConfigurationClassName works fine, it returns correct class name, also loadClass doesn't throw any exception.

public class Agent {



    private static boolean scanned;



    public static void premain(String arentArgs, Instrumentation inst) {

        inst.addTransformer( new ClassFileTransformer() {

            @Override

            public byte transform ( ClassLoader loader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte classfileBuffer )

                    throws IllegalClassFormatException {

                if(!scanned) {

                    ClassInfoList configrationClassName = findConfigrationClassName();

                    for(ClassInfo cl : configrationClassName) {

                        try {

                            loader.loadClass( cl.getName().replaceAll( "\.", "\" ) );

                        } catch ( ClassNotFoundException e ) {

                            e.printStackTrace();

                        }

                    }

                }

            ClassReader reader = new ClassReader(classfileBuffer);

            ClassWriter writer = new ClassWriter(reader, 0);

            ClassPrinter visitor = new ClassPrinter(writer);

            reader.accept(visitor, 0);

            return writer.toByteArray();



            }

        });



    }



    public static ClassInfoList findConfigrationClassName() {

        scanned = true;

        String routeAnnotation = "my.package";

        try (ScanResult scanResult =

                     new ClassGraph()

                             .enableAllInfo()

                             .whitelistPackages("my")

                             .scan()) {

            for (ClassInfo routeClassInfo : scanResult.getClassesWithAnnotation(routeAnnotation)) {

                AnnotationInfo routeAnnotationInfo = routeClassInfo.getAnnotationInfo(routeAnnotation);

                List<AnnotationParameterValue> routeParamVals = routeAnnotationInfo.getParameterValues();

                String route = (String) routeParamVals.get(0).getValue();

                System.out.println(routeClassInfo.getName() + " is annotated with route " + route);

            }



            return scanResult.getClassesWithAnnotation(routeAnnotation);

        }

    }

}