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From "Guangtai Liang (Created) (JIRA)" <server-...@james.apache.org>
Subject [jira] [Created] (JAMES-1381) An incomplete fix for the resource leak bugs in NNTPHandler.java
Date Thu, 23 Feb 2012 01:03:48 GMT
An incomplete fix for the resource leak bugs in NNTPHandler.java
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                 Key: JAMES-1381
                 URL: https://issues.apache.org/jira/browse/JAMES-1381
             Project: JAMES Server
          Issue Type: Bug
          Components: NNTPServer & Repository (removed)
    Affects Versions: 2.3.2, 2.3.1, 2.3.0
            Reporter: Guangtai Liang
            Priority: Critical


The fix revision 108172 was aimed to remove resource leak bugs on the BufferedReader object
"reader" (created in line 308), the InternetPrintWriter object "writer" in the method "handleConnection"of
the file "/james/server/trunk/src/java/org/apache/james/nntpserver/NNTPHandler.java (now moved
to /james/server/branches/v2.3/src/java/org/apache/james/nntpserver/NNTPHandler.java)" , but
it is incomplete.

There are some problems: 
1. when "reader" isn't created successfully but the temp InputStreamReader object is created
successfully (at line 308), the temp InputStreamReader object will be leaked. 
2. when "writer" isn't created successfully but the temp BufferedWriter object is created
successfully (at line 309), the temp BufferedWriter object will be leaked. 
3. when the temp BufferedWriter object isn't created successfully but the temp OutputStreamWriter
object is created successfully (at line 309), the temp OutputStreamWriter object will be leaked.


The best way to close such resource objects is putting such close operations for all resource

objects in the finaly block of a try-catch-finally structure and then putting all other code
in a try block.

The problem still exists in the head revision (the temp InputStreamReader object created at
line 383 and the "outs" created at line 384 can be leaked). The buggy code is copied as bellows:

 public void handleConnection( Socket connection ) throws IOException {
        try {
            this.socket = connection;
            synchronized (this) {
                handlerThread = Thread.currentThread();
            }
            remoteIP = socket.getInetAddress().getHostAddress();
            remoteHost = socket.getInetAddress().getHostName();
            in = new BufferedInputStream(socket.getInputStream(), 1024);
            // An ASCII encoding can be used because all transmissions other
            // that those in the message body command are guaranteed
            // to be ASCII
 383           reader = new BufferedReader(new InputStreamReader(in, "ASCII"), 512);
 384           outs = new BufferedOutputStream(socket.getOutputStream(), 1024);
 385           writer = new InternetPrintWriter(outs, true);
        } catch (Exception e) {
           ......
        }

        try {
          ......
        } catch (Exception e) {
           ......
        } finally {
 436         resetHandler();
        }
    }

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