How can I prevent implementation class to be loadable by foreign bundles?

[Sahoo]

Hi,

I am quite surprised to see that I am able to load classes belonging to 
packages that are *not* exported. I am able to do so by using 
getClassLoader() on an exported class. Here is my test case: 

I have two bundles, viz: osgi-test2-foo and osgi-test2-bar. The former 
one defines two packages, viz: sahoo.osgitest2.foo.api and 
sahoo.osgitest2.foo.impl. The latter package is *not* exported. The 
second bundle, osgi-test2-bar, imports the exported package 
sahoo.osgitest2.foo.api. It also defines a class called 
sahoo.osgitest2.bar.Bar, which is shown below. This class runs fine; it 
is able to load FooImpl which is an un-exported class!

// Bar.java
package sahoo.osgitest2.bar; 
public class Bar implements org.osgi.framework.BundleActivator { 

  public void start(org.osgi.framework.BundleContext context) throws 
Exception { 
      Class c = 
sahoo.osgitest2.foo.api.Foo.class.getClassLoader().loadClass( 
"sahoo.osgitest2.foo.impl.FooImpl"); 
  } 

  public void stop(org.osgi.framework.BundleContext context) throws 
Exception { 
  } 

} 

I was hoping to see a ClassNotFoundException while trying to load 
FooImpl from Bar. Any reason why OSGi allows this? Is there a way to 
prevent such class loading?

Thanks, 
Sahoo

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