modjy - tomcat6 - maximum recursion depth exceeded

[Will-123]

Hi All -

I'm just getting started with Jython - really impressed so far.
I've been trying to get the modjy_webapp demo app working with tomcat6,
but I'm getting the following:

javax.servlet.ServletException: Exception creating modjy servlet: Traceback (most recent call last):
  File "/usr/lib/jython/Lib/modjy/modjy.py", line 43, in __init__
    HttpServlet.__init__(self)
RuntimeError: maximum recursion depth exceeded

I've really no idea where to go from here! Can anyone help please?

Cheers,

--
Will Temperley
Malaria Atlas Project
Department of Zoology
University of Oxford
OX1 3PS

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[Alan Kennedy-2]

I can confirm that bug: I see the same behaviour on Tomcat 6.

I'm currently looking into the cause.

Alan.

On Thu, Oct 15, 2009 at 3:35 PM, Will <william.temperley@...> wrote:

> Hi All -
>
> I'm just getting started with Jython - really impressed so far.
> I've been trying to get the modjy_webapp demo app working with tomcat6,
> but I'm getting the following:
>
> javax.servlet.ServletException: Exception creating modjy servlet: Traceback (most recent call last):
>  File "/usr/lib/jython/Lib/modjy/modjy.py", line 43, in __init__
>    HttpServlet.__init__(self)
> RuntimeError: maximum recursion depth exceeded
>
> I've really no idea where to go from here! Can anyone help please?
>
> Cheers,
>
> --
> Will Temperley
> Malaria Atlas Project
> Department of Zoology
> University of Oxford
> OX1 3PS
>
> ------------------------------------------------------------------------------
> Come build with us! The BlackBerry(R) Developer Conference in SF, CA
> is the only developer event you need to attend this year. Jumpstart your
> developing skills, take BlackBerry mobile applications to market and stay
> ahead of the curve. Join us from November 9 - 12, 2009. Register now!
> http://p.sf.net/sfu/devconference
> _______________________________________________
> Jython-users mailing list
> Jython-users@...
> https://lists.sourceforge.net/lists/listinfo/jython-users
>

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[Will-123]

Great - thanks Alan. Anything I can help with, please let me know.

Will

Alan Kennedy wrote:

> I can confirm that bug: I see the same behaviour on Tomcat 6.
>
> I'm currently looking into the cause.
>
> Alan.
>
> On Thu, Oct 15, 2009 at 3:35 PM, Will <william.temperley@...> wrote:
>  
>> Hi All -
>>
>> I'm just getting started with Jython - really impressed so far.
>> I've been trying to get the modjy_webapp demo app working with tomcat6,
>> but I'm getting the following:
>>
>> javax.servlet.ServletException: Exception creating modjy servlet: Traceback (most recent call last):
>>  File "/usr/lib/jython/Lib/modjy/modjy.py", line 43, in __init__
>>    HttpServlet.__init__(self)
>> RuntimeError: maximum recursion depth exceeded
>>
>> I've really no idea where to go from here! Can anyone help please?
>>
>> Cheers,
>>
>> --
>> Will Temperley
>> Malaria Atlas Project
>> Department of Zoology
>> University of Oxford
>> OX1 3PS
>>
>> ------------------------------------------------------------------------------
>> Come build with us! The BlackBerry(R) Developer Conference in SF, CA
>> is the only developer event you need to attend this year. Jumpstart your
>> developing skills, take BlackBerry mobile applications to market and stay
>> ahead of the curve. Join us from November 9 - 12, 2009. Register now!
>> http://p.sf.net/sfu/devconference
>> _______________________________________________
>> Jython-users mailing list
>> Jython-users@...
>> https://lists.sourceforge.net/lists/listinfo/jython-users
>>
>>    

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[Alan Kennedy-2]

[Will]
> I've been trying to get the modjy_webapp demo app working with tomcat6,
> but I'm getting the following:
>
> javax.servlet.ServletException: Exception creating modjy servlet: Traceback (most recent call last):
>  File "/usr/lib/jython/Lib/modjy/modjy.py", line 43, in __init__
>    HttpServlet.__init__(self)
> RuntimeError: maximum recursion depth exceeded

I've been looking at this one some more.

One unusual aspect is that I see the problem when running Tomcat 6 as
a Windows service, but not see it when I run the Tomcat from the
command line, using the "startup.bat" and "shutdown.bat" in the "bin"
directory.

Will, can you please try running the Tomcat 6 from the command line,
and see if the problem still happens?

This difference in behaviours leads me to believe that the problem
perhaps relates to some difference between JDKs and JREs, with the
command line using the former and the Windows service using the
latter.

Thinking that it may be memory related, I increased the memory
allocation for the Windows service to a large amount, 1024M. But the
problem still happens.

The traceback reported is attached.

At this stage, I don't know what is causing this problem, and am open
to suggestions for avenues of research to follow up.

Regards,

Alan.

SEVERE: Servlet /modjy_webapp threw load() exception
Traceback (most recent call last):
  File "C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\modjy_webapp\WEB-INF\lib-python\Lib\modjy\modjy.py", line 43, in __init__
    HttpServlet.__init__(self)
RuntimeError: maximum recursion depth exceeded

        at org.python.core.PyException.fillInStackTrace(PyException.java:70)
        at java.lang.Throwable.<init>(Throwable.java:181)
        at java.lang.Exception.<init>(Exception.java:29)
        at java.lang.RuntimeException.<init>(RuntimeException.java:32)
        at org.python.core.PyException.<init>(PyException.java:46)
        at org.python.core.PyException.<init>(PyException.java:43)
        at org.python.core.PyException.<init>(PyException.java:61)
        at org.python.core.Py.RuntimeError(Py.java:124)
        at org.python.core.Py.JavaError(Py.java:450)
        at org.python.core.PyTableCode.call(PyTableCode.java:168)
        at org.python.core.PyBaseCode.call(PyBaseCode.java:297)
        at org.python.core.PyBaseCode.call(PyBaseCode.java:191)
        at org.python.core.PyFunction.__call__(PyFunction.java:385)
        at org.python.core.PyMethod.__call__(PyMethod.java:215)
        at org.python.core.PyMethod.instancemethod___call__(PyMethod.java:221)
        at org.python.core.PyMethod.__call__(PyMethod.java:206)
        at org.python.core.PyObjectDerived.dispatch__init__(PyObjectDerived.java:1097)
        at org.python.core.PyType.invoke_new_(PyType.java:444)
        at org.python.core.PyType.type___call__(PyType.java:1397)
        at org.python.core.PyType.__call__(PyType.java:1388)
        at org.python.core.PyObject.__call__(PyObject.java:381)
        at ModjyJServlet.init(ModjyJServlet.java:103)
        at javax.servlet.GenericServlet.init(GenericServlet.java:212)
        at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1173)
        at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:993)
        at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4149)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4458)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:526)
        at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:987)
        at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:909)
        at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:495)
        at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1206)
        at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:314)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
        at org.apache.catalina.core.StandardHost.start(StandardHost.java:722)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
        at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
        at org.apache.catalina.core.StandardService.start(StandardService.java:516)
        at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:583)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
18-Oct-2009 17:04:16 org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Allocate exception for servlet modjy
Traceback (most recent call last):
  File "C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\modjy_webapp\WEB-INF\lib-python\Lib\modjy\modjy.py", line 43, in __init__
    HttpServlet.__init__(self)
RuntimeError: maximum recursion depth exceeded

        at org.python.core.PyException.fillInStackTrace(PyException.java:70)
        at java.lang.Throwable.<init>(Throwable.java:181)
        at java.lang.Exception.<init>(Exception.java:29)
        at java.lang.RuntimeException.<init>(RuntimeException.java:32)
        at org.python.core.PyException.<init>(PyException.java:46)
        at org.python.core.PyException.<init>(PyException.java:43)
        at org.python.core.PyException.<init>(PyException.java:61)
        at org.python.core.Py.RuntimeError(Py.java:124)
        at org.python.core.Py.JavaError(Py.java:450)
        at org.python.core.PyTableCode.call(PyTableCode.java:168)
        at org.python.core.PyBaseCode.call(PyBaseCode.java:297)
        at org.python.core.PyBaseCode.call(PyBaseCode.java:191)
        at org.python.core.PyFunction.__call__(PyFunction.java:385)
        at org.python.core.PyMethod.__call__(PyMethod.java:215)
        at org.python.core.PyMethod.instancemethod___call__(PyMethod.java:221)
        at org.python.core.PyMethod.__call__(PyMethod.java:206)
        at org.python.core.PyObjectDerived.dispatch__init__(PyObjectDerived.java:1097)
        at org.python.core.PyType.invoke_new_(PyType.java:444)
        at org.python.core.PyType.type___call__(PyType.java:1397)
        at org.python.core.PyType.__call__(PyType.java:1388)
        at org.python.core.PyObject.__call__(PyObject.java:381)
        at ModjyJServlet.init(ModjyJServlet.java:103)
        at javax.servlet.GenericServlet.init(GenericServlet.java:212)
        at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1173)
        at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:809)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:129)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
        at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:859)
        at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:574)
        at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1527)
        at java.lang.Thread.run(Thread.java:619)

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[Alan Kennedy-2]

[Alan]
> At this stage, I don't know what is causing this problem, and am open
> to suggestions for avenues of research to follow up.

I have recorded this bug in the jython tracker.

Jython crashes in unknown circumstances when running on Tomcat 6 as
Windows Service.
http://bugs.jython.org/issue1489

I still don't know what's causing the bug, and would welcome input
from anyone who might have suggestions.

Meantime, I have also submitted a question to the Tomcat list to try
and determine what is the difference between running Tomcat 6 as a
Windows service and from the command line.

http://www.nabble.com/What-is-the-difference-between-running-Tomcat-6-as-a-Windows-Service--vs.-running-from-the-command-line--td25960450.html

Regards,

Alan.

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