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public class Operation {
  static void doOperation(String some_file) throws IOException {
    try (BufferedReader reader = new BufferedReader(new FileReader(some_file))) {
      // Do operations
    }
  }

  public static void main(String[] args) {
    if (args.length < 1) {
      System.out.println("Please supply a path as an argument");
      return;
    }
    try {
      doOperation( args[0]);
    } catch (IOException ex) {
      System.out.println("thrown exception: " + ex.toString());
      Throwable[] suppressed = ex.getSuppressed();
      for (int i = 0; i < suppressed.length; i++) {
        System.out.println("suppressed exception: " + suppressed[i].toString());
      }

      // how handle exception(s)
    }
  }
}

If an error occurs in the try block of the doOperation() method it will propagate out of the method and be printed as the thrown exception. If an error occurs while closing the reader, that error will propagate out of doOperation() and be printed as the thrown exception. If both errors occur, the try-block error will propagates out of the doOperation() and be printed as the thrown exception. The close error is suppressed and printed as the suppressed exception. In all cases the reader is safely closed.

This example may appear to violate ERR00-J. Do not suppress or ignore checked exceptions, but actually does not. This example is to be run from a command line, and its purpose is to demonstrate how multiple exceptions are stored in Java 1.7. Consequently, for this program, printing out key parts of thrown exceptions, is an appropriate way of handling them.

Risk Assessment

Failure to handle an exception in a finally block can lead to unexpected results.

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