Sharing dynamically loaded classes with JShell instance

Question

Please view the edits below

I\'m trying to create a JShell instance that gives me access to, and lets me interact with objects in the <

Answer 1

The solution is to create a custom LoaderDelegate implementation, that supplies instances of already loaded classes instead of loading them again. A simple example is to use the default implementation, DefaultLoaderDelegate (source) and override the findClass method of its internal RemoteClassLoader

@Override
protected Class findClass(String name) throws ClassNotFoundException {
    byte[] b = classObjects.get(name);
    if (b == null) {
        Class c = null;
        try {
            c = Class.forName(name);//Use a custom way to load the class
        } catch(ClassNotFoundException e) {
        }
        if(c == null) {
            return super.findClass(name);
        }
        return c;
    }
    return super.defineClass(name, b, 0, b.length, (CodeSource) null);
}

To create a working JShell instance, use the following code

JShell shell = JShell.builder()
    .executionEngine(new ExecutionControlProvider() {
        @Override
        public String name() {
            return "name";
        }

        @Override
        public ExecutionControl generate(ExecutionEnv ee, Map map) throws Throwable {
            return new DirectExecutionControl(new CustomLoaderDelegate());
        }
    }, null)
    .build();
shell.addToClasspath("Example.jar");//Add custom classes to Classpath, otherwise they can not be referenced in the JShell