Re: TeeOutputStream?

From:

Stanimir Stamenkov <s7an10@netscape.net>

Newsgroups:

comp.lang.java.help

Date:

Sun, 05 Jun 2011 10:44:47 +0300

Message-ID:

<isfc5f$jcm$1@dont-email.me>

Sat, 04 Jun 2011 17:17:04 -0700, /Knute Johnson/:

public void close() throws IOException {
     try {
         os1.close();
     } finally {
         os2.close();
     }
}

This guarantees that both close() methods will get called. If both
methods throw IOExceptions the caller will never see the first one as it
will be hidden.

I usually do:

     boolean success = false;
     try {
         os1.close();
         success = true;
     } finally {
         try {
             os2.close();
         } catch (IOException ex) {
             if (success) {
                 throw ex;
             }
             // Log 'ex' possibly as warning to look at
             // subsequent error logs for details (about
             // the "original" exception).
         }
     }

Yes it looks messy. Java 7 promises to bring improvement in that
area with try-with-resources (auto-closeable resources) and
exception masking:

http://www.oracle.com/technetwork/articles/java/trywithresources-401775.html

--
Stanimir