Michael Suhr created AXIOM-524:
----------------------------------

             Summary: Attempted read on closed stream for multithreaded 
environment
                 Key: AXIOM-524
                 URL: https://issues.apache.org/jira/browse/AXIOM-524
             Project: Axiom
          Issue Type: Bug
    Affects Versions: 2.0.0
            Reporter: Michael Suhr


I don't know if it's an issue for Axiom, Axis or the underlying Http Client 
(Httpclient 5 in my case).

I have a wsdl Service and call them often. Sometimes an error is shown:

{noformat}
org.apache.axiom.om.OMException: java.io.IOException: Attempted read on closed 
stream.
        at 
org.apache.axiom.om.impl.common.factory.meta.DetachableInputStream.detach(DetachableInputStream.java:75)
        at 
org.apache.axiom.om.impl.common.builder.OMXMLParserWrapperImpl.detach(OMXMLParserWrapperImpl.java:92)
        at 
org.apache.axis2.kernel.TransportUtils.detachInputStream(TransportUtils.java:578)
...
Caused by: java.io.IOException: Attempted read on closed stream.
        at 
org.apache.hc.core5.http.io.EofSensorInputStream.isReadAllowed(EofSensorInputStream.java:107)
        at 
org.apache.hc.core5.http.io.EofSensorInputStream.read(EofSensorInputStream.java:133)
        at 
org.apache.axiom.blob.MemoryBlobOutputStreamImpl.readFrom(MemoryBlobOutputStreamImpl.java:83)
        at org.apache.axiom.blob.MemoryBlobImpl.readFrom(MemoryBlobImpl.java:67)
        at 
org.apache.axiom.om.impl.common.factory.meta.DetachableInputStream.detach(DetachableInputStream.java:73)
{noformat}

For some investigation I added some breakpoints in IntelliJ to force a sleep.
h5. Debugging hints
- Add breakpoint with Evaluate at:
{code:java|title=org.apache.axiom.om.impl.common.factory.meta.DetachableInputStream#detach}
// Some comments here
    @Override
    public void detach() throws OMException {
        MemoryBlob blob = Blobs.createMemoryBlob(); //<-- add log here to see 
when its called
        try {
            blob.readFrom(target); <-- add here breakpoint (no suspend) with 
Thread.sleep(2000) and log that it shoul read
        } catch (StreamCopyException ex) {
            throw new OMException(ex.getCause()); <-- Here Breapoint to stop on 
error
        }
        if (closeOnDetach) {
            try {
                target.close();
            } catch (IOException ex) {
                throw new OMException(ex);
            }
        }
        target = blob.readOnce();
    }
{code}
- add beakpoint with log {{"close " + Thread.currentThread().getName() + " - " 
+ this.toString()}}:
{code:java|title=org.apache.hc.core5.http.io.EofSensorInputStream#close}
// Some comments here
    public void close() throws IOException {
        // tolerate multiple calls to close()
        selfClosed = true; // <-- add here the Log
        checkClose();
    }
{code}

If the service is now called twice I got the following log:

{noformat}
close http-nio-8280-exec-8 - 
org.apache.hc.core5.http.io.EofSensorInputStream@415a5c70
isReadAllowed: http-nio-8280-exec-8 - 
org.apache.hc.core5.http.io.EofSensorInputStream@757826d0: true
detach http-nio-8280-exec-8 - 
org.apache.hc.core5.http.io.EofSensorInputStream@757826d0
Breakpoint reached at 
org.apache.hc.core5.http.io.EofSensorInputStream.close(EofSensorInputStream.java:174)
close http-nio-8280-exec-6 - 
org.apache.hc.core5.http.io.EofSensorInputStream@757826d0
isReadAllowed: http-nio-8280-exec-6 - 
org.apache.hc.core5.http.io.EofSensorInputStream@48d7382c: true
detach http-nio-8280-exec-6 - 
org.apache.hc.core5.http.io.EofSensorInputStream@48d7382c
detach after sleep:     http-nio-8280-exec-8 - 
org.apache.hc.core5.http.io.EofSensorInputStream@757826d0
isReadAllowed: http-nio-8280-exec-8 - 
org.apache.hc.core5.http.io.EofSensorInputStream@757826d0: false
detach after sleep:     http-nio-8280-exec-6 - 
org.apache.hc.core5.http.io.EofSensorInputStream@48d7382c
isReadAllowed: http-nio-8280-exec-6 - 
org.apache.hc.core5.http.io.EofSensorInputStream@48d7382c: true
Breakpoint reached at 
org.apache.hc.core5.http.io.EofSensorInputStream.close(EofSensorInputStream.java:174)
close http-nio-8280-exec-6 - 
org.apache.hc.core5.http.io.EofSensorInputStream@48d7382c
Breakpoint reached at 
org.apache.axiom.om.impl.common.factory.meta.DetachableInputStream.detach(DetachableInputStream.java:75)
detach after sleep:     http-nio-8280-exec-8 - 
org.apache.hc.core5.http.io.EofSensorInputStream@757826d0
Breakpoint reached at 
org.apache.hc.core5.http.io.EofSensorInputStream.close(EofSensorInputStream.java:174)
close http-nio-8280-exec-8 - 
org.apache.hc.core5.http.io.EofSensorInputStream@757826d0
{noformat}
 You see that for {{EofSensorInputStream@757826d0}} the thread 
{{http-nio-8280-exec-8}} enter the detach method. but in meantime the thread 
{{http-nio-8280-exec-6 }} call close on it.

I try to create a running Test for it and if possible I will provide it to you 
as well

Maybe related to: AXIOM-517



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