Warning: SimpleHttpConnectionManager being used incorrectly

[desolat-2]

I get the following warning from the SimpleHttpConnectionManager:

org.apache.commons.httpclient.SimpleHttpConnectionManager
getConnectionWithTimeout
WARNUNG: SimpleHttpConnectionManager being used incorrectly.  Be sure
that HttpMethod.releaseConnection() is always called and that only one
thread and/or method is using this connection manager at a time.

Is there a way to supress these warning messages from the console?
Under which circumstances can this warning appear?

For the background: I use the HttpClient in an Apache XML-RPC client
context in a single-threaded library. The warning just appears when I
use this library via JPype in Python scripts, which are also
single-threaded.

Any idea how to fix this small issue? Or an explanation why it happens?

Thx
Chris

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[sebb-2-2]

On 23/09/2009, Christoph Jaehnigen <christoph.jaehnigen@...> wrote:

> I get the following warning from the SimpleHttpConnectionManager:
>
>  org.apache.commons.httpclient.SimpleHttpConnectionManager
>  getConnectionWithTimeout
>  WARNUNG: SimpleHttpConnectionManager being used incorrectly.  Be sure
>  that HttpMethod.releaseConnection() is always called and that only one
>  thread and/or method is using this connection manager at a time.
>
>  Is there a way to supress these warning messages from the console?
>  Under which circumstances can this warning appear?
>
>  For the background: I use the HttpClient in an Apache XML-RPC client
>  context in a single-threaded library. The warning just appears when I
>  use this library via JPype in Python scripts, which are also
>  single-threaded.
>
>  Any idea how to fix this small issue? Or an explanation why it happens?

Does the code do what the error message says?

The error message says it all really...

>  Thx
>  Chris
>
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>

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[desolat-2]

On Wed, Sep 23, 2009 at 17:20, sebb <sebbaz@...> wrote:
>
> Does the code do what the error message says?
>
> The error message says it all really...

That's the point: I do not explicitly use threading, not in Java and
not in the Python code myself. As I get the warnings just when using
the Java library via JPype in Python there seems to be some threading
involved but I could not figure out where and why.

Chris

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[sebb-2-2]

On 23/09/2009, Christoph Jaehnigen <christoph.jaehnigen@...> wrote:

> On Wed, Sep 23, 2009 at 17:20, sebb <sebbaz@...> wrote:
>  >
>  > Does the code do what the error message says?
>  >
>  > The error message says it all really...
>
>
> That's the point: I do not explicitly use threading, not in Java and
>  not in the Python code myself. As I get the warnings just when using
>  the Java library via JPype in Python there seems to be some threading
>  involved but I could not figure out where and why.
>

"Be sure that HttpMethod.releaseConnection() is always called" ?

>  Chris
>
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>

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[olegk]

On Wed, Sep 23, 2009 at 05:53:03PM +0200, Christoph Jaehnigen wrote:

> On Wed, Sep 23, 2009 at 17:20, sebb <sebbaz@...> wrote:
> >
> > Does the code do what the error message says?
> >
> > The error message says it all really...
>
> That's the point: I do not explicitly use threading, not in Java and
> not in the Python code myself. As I get the warnings just when using
> the Java library via JPype in Python there seems to be some threading
> involved but I could not figure out where and why.
>
> Chris
>

This has nothing to do with threading. This warning simply indicates that the
connection manager received a request for HTTP connection that has been already
allocated (and never released back).

Oleg



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[desolat-2]

On Wed, Sep 23, 2009 at 18:23, Oleg Kalnichevski <olegk@...> wrote:
>
> This has nothing to do with threading. This warning simply indicates that the
> connection manager received a request for HTTP connection that has been already
> allocated (and never released back).

Ah, slowly getting to it: it seems that when calling the Java library
(with the HttpClient inside) from Python, the HTTP connection closing
does not work. In the XML-RPC code I found the place where they
silently ignore the exception being thrown when closing a connection
fails. Thx for the hints, anyway I do not see a way to get that fixed
myself.

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