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From "Eric Charles (Commented) (JIRA)" <server-...@james.apache.org>
Subject [jira] [Commented] (JAMES-1384) An incomplete fix for the resource leak bugs in SMTPHandler.java
Date Thu, 23 Feb 2012 09:25:51 GMT

    [ https://issues.apache.org/jira/browse/JAMES-1384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13214493#comment-13214493
] 

Eric Charles commented on JAMES-1384:
-------------------------------------

Hi there, Thx for the patch!
We don't plan a maintenance release for james 2.3 soon :/, so your best bet is to build your
own with the patch applied.
Eric

                
> An incomplete fix for the resource leak bugs in SMTPHandler.java
> ----------------------------------------------------------------
>
>                 Key: JAMES-1384
>                 URL: https://issues.apache.org/jira/browse/JAMES-1384
>             Project: JAMES Server
>          Issue Type: Bug
>          Components: SMTPServer
>    Affects Versions: 2.3.0, 2.3.1, 2.3.2
>            Reporter: Guangtai Liang
>            Priority: Critical
>   Original Estimate: 10m
>  Remaining Estimate: 10m
>
> The fix revision 108172 was aimed to remove resource leak bugs on the Socket object "this.socket"
(created in line 275), the BufferedInputStream object "in" (line 276), the BufferedReader
object "inReader" (line 280), the InternetPrintWriter object "out" (line 312) in the method
"handleConnection"of the file "/james/server/trunk/src/java/org/apache/james/smtpserver/SMTPHandler.java.java
(now moved to /james/server/branches/v2.3/src/java/org/apache/james/smtpserver/SMTPHandler.java)"
, but it is incomplete.
> There are some problems: 
> 1. Only "socket" is closed explicitly, other resource objects "in", "inReader", "out"
are not closed .
> 2. when "inReader" isn't created successfully but the temp InputStreamReader object is
created successfully (at line 280), the temp InputStreamReader object will be leaked. 
> 3. when the statements at lines 299-307 throw exceptions, the "socket", "in", "inReader"
will be leaked. 
> 4. when "out" isn't created successfully but the temp BufferedWriter object is created
successfully (at line 312), the temp BufferedWriter object will be leaked. 
> 5. when the temp BufferedWriter object isn't created successfully but the temp OutputStreamWriter
object is created successfully (at line 312), 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 buggy code is copied as bellows:
> public void handleConnection(Socket connection) throws IOException {
>         try {
> 275            this.socket = connection;
> 276            in = new BufferedInputStream(socket.getInputStream(), 1024);
>             // An ASCII encoding can be used because all transmissions other
>             // that those in the DATA command are guaranteed
>             // to be ASCII
> 280            inReader = new BufferedReader(new InputStreamReader(in, "ASCII"), 512);
>             remoteIP = socket.getInetAddress().getHostAddress();
>             remoteHost = socket.getInetAddress().getHostName();
>             smtpID = random.nextInt(1024) + "";
>             resetState();
>         } catch (Exception e) {
>                      ......
>         }
>  299       if (getLogger().isInfoEnabled()) {
>                      ......
>  307           getLogger().info(infoBuffer.toString());
>         }
>         try {
> 312            out = new InternetPrintWriter(new BufferedWriter(new OutputStreamWriter
> (socket.getOutputStream()), 1024), false);
>             // Initially greet the connector
>             // Format is:  Sat, 24 Jan 1998 13:16:09 -0500
>           ......
>         } catch (SocketException se) {
>                      ......
>         } catch ( InterruptedIOException iioe ) {
>           ......
>         } catch ( IOException ioe ) {
>           ......
>         } catch (Exception e) {
>           ......
>         } finally {
>  372           resetHandler();
>         }
>     }

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