Way to capture System.out in a *sandboxed* app.?

System.out/err cannot be redirected in a sandboxed**
application(/applet).

Assuming you wanted to to show the end user the
System.out/System.err from a *sandboxed* app.*, how
would you go about collecting the information?

* Note - I am looking at launching apps. written by other
people, so I need to intercept/duplicate the normal
System.out/err they might use. The GUI might be
invoked by a 'full trust' app. - then the task is easy,
*but otherwise,* is there a (sandboxed) way to intercept
those streams?

**This (sandboxed) Applet is not allowed to set the
output stream..

<sscce>
import java.applet.Applet;
import java.awt.Label;
import java.io.PrintStream;
import java.io.ByteArrayOutputStream;

public class RedirectOutputInApplet extends Applet {

  public void init() {
    try {
      PrintStream ps = new PrintStream(
        new ByteArrayOutputStream());
      System.setOut(ps);
    } catch(Throwable t) {
      add(new Label(t.getMessage()) );
    }
  }
}
</sscce>

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