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

Tuesday, 28 April 2015

    [
https://issues.jboss.org/browse/WFLY-4561?page=com.atlassian.jira.plugin....
] 

Mark S edited comment on WFLY-4561 at 4/28/15 3:57 PM:
-------------------------------------------------------

I agree that calling close should be idempotent (i.e.  Can be called multiple times with
the same effect ).  Yeah it was my mistake, I guess I was expecting at least a warning
when an InputStream is closed with unread data.

was (Author: marks1900):
I agree that calling close should be idempotent (i.e.  Can be called multiple times with
the same effect ).  Yeah it was my mistake, I guess I was expecting at least a warning
when a InputStream is closed with unread data.

...
 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
         Attachments: AsyncIOServletTest.java

 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.
 h4. Case 1
 Client Request:
 {code}
 curl -X POST -H "Content-Type: application/x-www-form-urlencoded" --data
'{"records":[{"key":"key1","value":"SGVsbG8gV29ybGQ="}]}'
"http://localhost:8080/webapp/test/test"; echo
 {code}
 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@24865a17
 2015-04-27 10:57:50,359 (INFO ) [] AsyncIOServletTest$1(48): onComplete called:
javax.servlet.AsyncEvent@54ff11f3
 {code}
 Client Response:
 {code}
 <html><head><title>Error</title></head><body>Internal
Server Error</body></html>
 {code}
 h4. Case 2
 Client Request:
 {code}
 curl -X POST -H "Content-Type: application/x-www-form-urlencoded" --data
'{"records":[{"key":"key1","value":"SGVsbG8gV29ybGQ="}]}'
"http://localhost:8080/webapp/test/test"; echo
 {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@3746c9ed
 {code}
 Client Response:
 {code}
 ...the response...
 {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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