[jboss-jira] [JBoss JIRA] (WFLY-4561) Servlet Nonblocking I/O Suppressed InputStream Closed Error

[Mark S (JIRA)]

Mark S created WFLY-4561:
----------------------------

             Summary: Servlet Nonblocking I/O Suppressed InputStream Closed Error
                 Key: WFLY-4561
                 URL: https://issues.jboss.org/browse/WFLY-4561
             Project: WildFly
          Issue Type: Feature Request
          Components: Web (Undertow)
    Affects Versions: 8.2.0.Final
            Reporter: Mark S
            Assignee: Stuart Douglas


Created a Nonblocking I/O Servlet by following JEE Tutorial example here:

https://docs.oracle.com/javaee/7/tutorial/servlets013.htm

Due to my Eclipse Development Environment giving me the warning "Potential resource leak: 'input' may not be closed", I made a mistake by wrapping the following line with a try-with-resources statement.

{code}
final ServletInputStream input = request.getInputStream();
{code}

Unfortunately, no exception was thrown to indicate that the connection was already closed before processing was attempted, where I believe there should have been.

--

I have added the relevant source code to reproduce my situation.  Please see attached code.

In the attached source, I added an AsyncListener to monitor the life cycle.


The handleRequestAsPerJeeTutorialWithInputStreamIssue method will give the following output:

{code}
2015-04-27 10:57:20,337 (INFO ) [] AsyncIOServletTest(37): doPost(..)
2015-04-27 10:57:50,345 (INFO ) [] AsyncIOServletTest$1(55): onTimeout called: javax.servlet.AsyncEvent at 24865a17
2015-04-27 10:57:50,359 (INFO ) [] AsyncIOServletTest$1(48): onComplete called: javax.servlet.AsyncEvent at 54ff11f3
{code}

The handleRequestAsPerJeeTutorial method will give the following output:

{code}
2015-04-27 10:56:32,111 (INFO ) [] AsyncIOServletTest(37): doPost(..)
2015-04-27 10:56:32,114 (INFO ) [] AsyncIOServletTest(84): handleRequestAsPerJeeTutorial(..)
2015-04-27 10:56:32,121 (INFO ) [] AsyncIOServletTest$2(97): onDataAvailable()
2015-04-27 10:56:32,121 (INFO ) [] AsyncIOServletTest$2(115): onAllDataRead()
2015-04-27 10:56:32,125 (INFO ) [] AsyncIOServletTest$1(48): onComplete called: javax.servlet.AsyncEvent at 3746c9ed
{code}

----

It is my opinion that a closed InputStream should cause an exception of some sort.  And in this case at minimum, I think that the AsyncListener's onError should be called.





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