Javassist: Get CtClass object from .class file

Step 1: Create InputStream to the class file

String classFilePath = "....";

File classFile = new File(classFilePath);

InputStream inputStream = new FileInputStream(classFile);

Step 2: Get CtClass instance from input stream

ClassPool classPool = ClassPool.getDefault();

CtClass ctClass = classPool.makeClass(inputStream);

App.java

package com.sample.app;

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;

import javassist.ClassPool;
import javassist.CtClass;

public class App {

 public static void main(String args[]) throws Exception {

  String classFilePath = "...."; // Add class file path here
  File classFile = new File(classFilePath);
  InputStream inputStream = new FileInputStream(classFile);

  ClassPool classPool = ClassPool.getDefault();
  CtClass ctClass = classPool.makeClass(inputStream);

  System.out.println(ctClass.getName());

 }
}

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