Modify a method annotation parameter at runtime

Modify a method annotation parameter at runtime

By : Sean F.
Date : November 17 2020, 11:58 AM
This might help you I wrote a class AnnotationUtil to resolve the seris requirements.
It can add/remove/change annotation value on class/field/method instance.
code :

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Objective-C modify parameter to method at runtime

Objective-C modify parameter to method at runtime

By : Marc-André Langlais
Date : March 29 2020, 07:55 AM
I wish this helpful for you You can't modify your source code or make up variable references at runtime. Objective-C isn't that dynamic.
If the values of kPlacement0 through kPlacementMax are sequential, you may be able to use a for loop to step through them directly:
code :
for (MyPlacement placement = kPlacement0; placement += kPlacementIncrement; placement <= kPlacementMax) {
    UIViewSubclass *instanceOfUIViewSubclass = [[UIViewSubclass alloc] initWithValue:([value integerValue])
    //Do something with instanceOfUIViewSubclass.
    [instanceOfUIViewSubclass release];
enum { numPlacements = <#Insert the number of placement constants here#> };
MyPlacement placements[numPlacements] = {

for (unsigned i = 0U; i < numPlacements; ++i) {
    UIViewSubclass *instanceOfUIViewSubclass = [[UIViewSubclass alloc] initWithValue:([value integerValue])
    //Do something with instanceOfUIViewSubclass.
    [instanceOfUIViewSubclass release];
Modify a class definition's annotation string parameter at runtime

Modify a class definition's annotation string parameter at runtime

By : Alysson N
Date : March 29 2020, 07:55 AM
will be helpful for those in need This code does more or less what you ask for - it is a simple proof of concept:
a proper implementation needs to also deal with the declaredAnnotations if the implementation of annotations in Class.java changes, the code will break (i.e. it can break at any time in the future) I have no idea if there are side effects...
code :
public static void main(String[] args) throws Exception {
    final Something oldAnnotation = (Something) Foobar.class.getAnnotations()[0];
    System.out.println("oldAnnotation = " + oldAnnotation.someProperty());
    Annotation newAnnotation = new Something() {

        public String someProperty() {
            return "another value";

        public Class<? extends Annotation> annotationType() {
            return oldAnnotation.annotationType();
    Field field = Class.class.getDeclaredField("annotations");
    Map<Class<? extends Annotation>, Annotation> annotations = (Map<Class<? extends Annotation>, Annotation>) field.get(Foobar.class);
    annotations.put(Something.class, newAnnotation);

    Something modifiedAnnotation = (Something) Foobar.class.getAnnotations()[0];
    System.out.println("modifiedAnnotation = " + modifiedAnnotation.someProperty());

@Something(someProperty = "some value")
public static class Foobar {

@interface Something {

    String someProperty();
Jackson - Modify an attribute at runtime without annotation

Jackson - Modify an attribute at runtime without annotation

By : Walter Lam
Date : March 29 2020, 07:55 AM
wish of those help You can use PropertyNamingStrategy class to override class property. See simple implementation of this class:
code :
class ReplaceNamingStrategy extends PropertyNamingStrategy {

    private static final long serialVersionUID = 1L;

    private Map<String, String> replaceMap;

    public ReplaceNamingStrategy(Map<String, String> replaceMap) {
        this.replaceMap = replaceMap;

    public String nameForGetterMethod(MapperConfig<?> config, AnnotatedMethod method, String defaultName) {
        if (replaceMap.containsKey(defaultName)) {
            return replaceMap.get(defaultName);

        return super.nameForGetterMethod(config, method, defaultName);
import java.io.IOException;
import java.util.Collections;
import java.util.Map;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.PropertyNamingStrategy;
import com.fasterxml.jackson.databind.cfg.MapperConfig;
import com.fasterxml.jackson.databind.introspect.AnnotatedMethod;

public class JacksonProgram {

    public static void main(String[] args) throws IOException {
        Msg msg = new Msg();
        msg.setData("Are you suggesting coconuts migrate?");

        System.out.println(convert(msg, "test"));
        System.out.println(convert(msg, "toto"));
        System.out.println(convert(msg, "groovy"));

    public static String convert(Msg msg, String name) throws IOException {
        ObjectMapper mapper = new ObjectMapper();
        mapper.setPropertyNamingStrategy(new ReplaceNamingStrategy(Collections.singletonMap("data", name)));
        return mapper.writeValueAsString(msg);
{"code":42,"test":"Are you suggesting coconuts migrate?"}
{"code":42,"toto":"Are you suggesting coconuts migrate?"}
{"code":42,"groovy":"Are you suggesting coconuts migrate?"}
how to modify an attribute of an annotation at runtime

how to modify an attribute of an annotation at runtime

By : hannah
Date : March 29 2020, 07:55 AM
it should still fix some issue Java Annotations are designed to associate static metadata to classes as Oracle says here.
Anyway, if you still want to associate this variable metadata to an annotation, you could achieve this associating a custom class to both annotations that is holding the value you want to be variable.
code :
// annotate your class with you custom class
Modify parameter of method by value in annotation aspectJ

Modify parameter of method by value in annotation aspectJ

By : whateveranyhow
Date : March 29 2020, 07:55 AM
this one helps. I started learing aspectJ and I wondering is it possible to create aspect in file .aj instead of annotation in .java, this is my example: , Yes, that is possible.
code :
public aspect MyAspect {

    public MyAspect() {
      System.out.println("Aspect instance created");

   pointcut myPointcut(ParameterType parameter)
               : ("execution(* *(..)) && @annotation(Te));

    Object around(ParameterType parameter) : myPointcut(parameter) {
       // Business logic here
       // 'thisJoinPointStaticPart' will give you access to join point
       // 'this' will give you access to advice instance itself
       // `return proceed();` will allow you to execute advised join point
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