Javassist: Add dynamically generated classes to a package

Just specify the full class name (including package name), javassist automatically add this class to the package.

 

Example

CtClass demoClass = classPool.makeClass("com.sample.app.model.Demo");

 

Find the below working application.

 

App.java

package com.sample.app;

import javassist.ClassPool;
import javassist.CtClass;
import javassist.CtField;
import javassist.Modifier;

public class App {

    public static void main(String args[]) throws Exception {
        ClassPool classPool = ClassPool.getDefault();

        CtClass demoClass = classPool.makeClass("com.sample.app.model.Demo");

        CtField ctField = new CtField(CtClass.doubleType, "PI", demoClass);
        ctField.setModifiers(Modifier.STATIC | Modifier.FINAL | Modifier.PUBLIC);
        
        demoClass.addField(ctField, "3.14");

        demoClass.writeFile("/Users/Shared/javassist");

    }
}

Run App.java.

 

You can observe Demo.class is created in /Users/Shared/javassist.

$tree /Users/Shared/javassist
/Users/Shared/javassist
└── com
    └── sample
        └── app
            └── model
                └── Demo.class

4 directories, 1 file

You can see the source code of Demo.class file in any Java decompiler.

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