Singleton getInstance returns new instances each time ?
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Key: AXIS-2030
URL: http://issues.apache.org/jira/browse/AXIS-2030
Project: Axis
Type: Bug
Components: Basic Architecture
Versions: 1.2
Environment: Linux AS2/AS3. Tomcat4. Axis 1.2.
Reporter: ultan ocarroll
We have an application using Axis1.2 as a client for a SOAP service.
Over 24 hour periods of time we see many many tcp connections (40000+) being
left open to that service. The connections are in ESTABLISHED state. What is a
critical problem is that on restart, our servers very often report "too many
open files" and fail to start or start with spurious errors.
I suspected originally that our version of Commons HttpClient (3.0rc2) was at
fault and found a reported issue very similar to ours
(http://mail-archives.apache.org/mod_mbox/jakarta-httpclient-user/200505.mbox/[EMAIL
PROTECTED] ).
However, the solution is not relevant to our situation (it recommends reverting
JDK version from 1.5 to 1.4.2 - we do this already).
Looking at the HttpClient code I cant see where the problem is arising. I
havent yet contacted the team behind HttpClient as during investigations Ive
come across what seems to be a problem with singleton instantiation in the
CommonsHttpSender.
I noticed when I set a breakpoint in CommonsHttpSender that I get a new
instance for each request and as a result get a new
MultiThreadedHttpConnectionManager on each request, each with a new connection
pool. Im not sure where in the stack this singleton should be managed, but
surely there should only be one instance of CommonsHttpSender or its
constructor should get a singleton reference to
MultiThreadedHttpConnectionManager ? Or am I missing something here ?
Heres the stack trace, if thats any help :
CommonsHTTPSender.initialize() line: 97
CommonsHTTPSender.<init>() line: 88
NativeConstructorAccessorImpl.newInstance0(Constructor, Object[]) line: not
available [native method]
NativeConstructorAccessorImpl.newInstance(Object[]) line: 39
DelegatingConstructorAccessorImpl.newInstance(Object[]) line: 27
Constructor.newInstance(Object[]) line: 274
Class.newInstance0() line: 308
Class.newInstance() line: 261
WSDDTransport(WSDDTargetedChain).makeNewInstance(EngineConfiguration) line: 157
WSDDTransport(WSDDDeployableItem).getNewInstance(EngineConfiguration) line: 274
WSDDTransport(WSDDDeployableItem).getInstance(EngineConfiguration) line: 260
WSDDDeployment.getTransport(QName) line: 441
FileProvider.getTransport(QName) line: 257
AxisClient(AxisEngine).getTransport(String) line: 332
AxisClient.invoke(MessageContext) line: 163
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