Get class created at runtime

Question

I'm trying to copy a .java file containing a class (MyTestClass in package "test") from some place on my disk. I want to get class which this file contains. Maybe my code will be useful. This is my code:

File generatedFile = new File( DIR_CONTAINING_FILE + "/" + className + ".java" );
FileUtils.copyFileToDirectory( generatedFile, COPY_FILE_DIR );
Class cl = Class.forName( "test.MyTestClass" );

Copying file works fine. It shows where it has to be.

When I copy my file to COPY_FILE_DIR manually and then start program it will work, it will find my class. But when I start my program without copying file first (I mean when I let it do to my program) I got ClassNotFoundException. When I refresh directories there's my file, so it has been copied perfectly.

In this moment I can start my program again and.. magic! it will find my class! Looks like I need to refresh directories from java or do something else.. I don't know what to do. Any help will be appreciated.

Answer 1

It seems you'll have to get familiar with the JavaCompiler API to do this. It's not really important where you store your .java Files - they have to be compiled to bytecode before you can try to use them inside the runtime.