After upgrading to Http Core 4.3, one of the integration tests intermittently
fail with the following error:
2013-08-10 00:54:21,501 [-] [PassThroughMessageProcessor-1] ERROR
PassThroughNHttpGetProcessor Error generating ?wsdl output for service :
StockQuoteProxy
java.nio.BufferOverflowException
at java.nio.HeapByteBuffer.put(HeapByteBuffer.java:165)
at
org.apache.http.nio.util.SimpleOutputBuffer.write(SimpleOutputBuffer.java:76)
at
org.apache.http.nio.entity.ContentOutputStream.write(ContentOutputStream.java:72)
at
org.apache.synapse.transport.passthru.api.PassThroughNHttpGetProcessor.sendResponseAndFinish(PassThroughNHttpGetProcessor.java:135)
at
org.apache.synapse.transport.passthru.api.PassThroughNHttpGetProcessor.generateWsdl(PassThroughNHttpGetProcessor.java:181)
at
org.apache.synapse.transport.passthru.api.PassThroughNHttpGetProcessor.process(PassThroughNHttpGetProcessor.java:110)
at
org.apache.synapse.transport.passthru.ServerWorker.run(ServerWorker.java:182)
at
org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:173)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)
This is a very specific scenario, where Synapse doesn't mediate the request,
but responds to the HTTP request on its own (WSDL generation scenario). Any
idea what could have cause this issue?
My guess is this is a race condition at the output buffer. SimpleOutputBuffer
is not thread safe as per the HTTP Core API docs. But it is being accessed by
server worker as well as the IO dispatcher in this particular scenario. I tried
using the SharedOutputBuffer and it seems to fix the problem (need to test this
further). Is this is a reasonable solution?
Thanks,
Hiranya
--
Hiranya Jayathilaka
Mayhem Lab/RACE Lab;
Dept. of Computer Science, UCSB; http://cs.ucsb.edu
E-mail: [email protected]; Mobile: +1 (805) 895-7443
Blog: http://techfeast-hiranya.blogspot.com
