Why is initial tag library request slow?

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Marcus Leon - 02 Oct 2005 06:42 GMT

Hi, my first request to a JSP page using a tag library (Display Tag
Library) takes about 10-15 seconds and subsequent requests are fast.
Does anyone know why the first request is slow?

I don't believe the slowness is jsp compiling as we precompile and it
seems that it is working. We're on Weblogic 8.1. My CPU is revving
at 100% during this start up period.

Is the container just loading the classes or is there some init routine
running? How can I debug this?

Thanks very much for the help!

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Roedy Green - 02 Oct 2005 08:51 GMT

>Is the container just loading the classes or is there some init routine
>running? How can I debug this?

If you have a java.exe command line you can get hold of, use the
-verbose option. You can then monitor classes loading.

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Canadian Mind Products, Roedy Green.
http://mindprod.com Again taking new Java programming contracts.

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Marcus Leon - 03 Oct 2005 15:22 GMT

Thanks Roedy! I do see that on the first (and only) request the JVM is
loading a lot of classes. Is there a way I can configure Weblogic to
load these classes at system start up?

The classes are mostly common classes (Jakarta Commons, log4j, etc) and
the tag library I am using (Display Tag Library).

Marcus.

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Roedy Green - 03 Oct 2005 18:28 GMT

>Thanks Roedy! I do see that on the first (and only) request the JVM is
>loading a lot of classes. Is there a way I can configure Weblogic to
>load these classes at system start up?

there may be a special BEA command to do it, but if you ran a custom
servlet at startup that simply looked at the serialVersionUID of the
classes of interest or called some trivial static method, that would
load the classes.

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Canadian Mind Products, Roedy Green.
http://mindprod.com Again taking new Java programming contracts.

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Why is initial tag library request slow?

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