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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