Why is servlet slow on first access?

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Marcus Leon - 24 May 2005 21:20 GMT

We're running on Weblogic. The first request always takes a few
seconds longer than all following requests. Does anyone know why?

We pre-compile our JSPs so it's not JSP compilation time.

These servlets do data access - does it have something to do with the
DB caching data for subsequent requests?

Or is it due to the classloader having to load some classes for the
first time?

Thanks

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enrique - 24 May 2005 22:14 GMT

Possibly the database connection being re-used in subsequent requests,
if you have that feature enabled.

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Wibble - 25 May 2005 02:08 GMT

Class loaders, JIT compiler, jar files reads, xml configuration
files to parse, db connections, session replication.

> We're running on Weblogic. The first request always takes a few
> seconds longer than all following requests. Does anyone know why?
[quoted text clipped - 8 lines]
>
> Thanks

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Antti S. Brax - 25 May 2005 06:49 GMT

marcus.leon@gmail.com wrote in comp.lang.java.programmer:

> We're running on Weblogic. The first request always takes a few
> seconds longer than all following requests. Does anyone know why?

    If your servlets are loaded when the first request arrives
    instead of being loaded during startup then this behaviour
    is quite normal.

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Ross Bamford - 25 May 2005 11:17 GMT

> We're running on Weblogic. The first request always takes a few
> seconds longer than all following requests. Does anyone know why?
[quoted text clipped - 8 lines]
>
> Thanks

You might find loading the servlets on startup rather than first use (as
is the default I believe). In web.xml:

<servlet>

<load-on-startup>1</load-on-startup>
</servlet>

The number determines the order to load in where you have multiple
servlets.

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Why is servlet slow on first access?

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