How to provide an interface to JavaCompiler when compiling a source file dynamically?

I'm trying to compile and load a class at runtime, without knowing the package of the class. I do know that the class should comply with an interface, and the location of the source, (and hence the class name). I'm trying the following:

/* Compiling source */
File root = new File("scripts");
File sourceFile = new File(root, "Test.java");
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
compiler.run(null, null, null, sourceFile.getPath());

where the Test.java file looks something like

import foo.Itest;
public class Test implements Itest{
...
}

And I get a cannot find symbol symbol : class Itest error from the compiler. How do I provide the compiler with the interface (which has already been loaded) to avoid this 开发者_如何学JAVAerror?

[EDIT - RESOLVED]: The error came from the fact the the interface was ITest and the source referred to an Itest interface.

It seems likely that the compiler.run() is running externally and needs the class path to be set. Have you tried to pass it a suitable class path setting using the last parameter args to the run() call? Perhaps that's why ToolProvider.getSystemToolClassLoader().

This stackoverflow post might also help you.

Not sure if this is what you're looking for but, as mentioned by @Phil here, you could try to pass a classpath argument in your compiler.run method.

Have you considered generating your class with javassist or something like that?