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package trusted;
import untrusted.RetValue;

public class MixMatch {
  private void privilegedMethod() throws IOException {
    try {
      FileInputStream fis
        = (FileInputStream) AccessController.doPrivileged(
	     new PrivilegedExceptionAction() {
               public FileInputStream run() throws FileNotFoundException {
	         return new FileInputStream(""file.txt"");            
	       }
             }
	   );
           
      RetValue rt = new RetValue();
      
      if(rt.getValue() == 1) {
	// do something with sensitive file	
      }
    } catch (PrivilegedActionException e) {
      // forward to handler and log 
    } finally {
      fis.close();
    }

  }

  public static void main(String[] args) throws IOException {
    MixMatch mm = new MixMatch();
    mm.privilegedMethod();
  }
}

package untrusted;

class RetValue {
  public int getValue() {
    return 1;
  }
}