How to add an external jar file to the classpath dynamically at runtime? [duplicate]

Question

I want to add a JAR file to my project's classpath dynamically using Java code. If it is possible, I want to use external jar files and load their classes, and then execute them as beans later (Spring Framework).

Answer 1

URLClassLoader child = new URLClassLoader (myJar.toURL(), this.getClass().getClassLoader()); Class classToLoad = Class.forName ("com.MyClass", true, child); Method method = classToLoad.getDeclaredMethod ("myMethod"); Object instance = classToLoad.newInstance (); Object result = method.invoke (instance); 

Source: https://stackoverflow.com/a/60775/1360074

Answer 2

You can try something like this, but it requires you to know, where exactly your JARs are located.

URLClassLoader cl = URLClassLoader.newInstance(new URL[] {myJarFiles}); Class myClass = cl.loadClass("com.mycomp.proj.myclass"); Method printMeMethod = myClass.getMethod("printMe", new Class[] {String.class, String.class}); Object myClassObj = myClass.newInstance(); Object response = printMeMethod.invoke(myClassObj, "String1", "String2");