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From "Datta, Abir - Ealing" <>
Subject RE: Classloading performance problems, Tomcat 8 upgrade from tomcat 6
Date Thu, 05 Nov 2015 17:17:41 GMT
Hi Mark,

Thanks for the response. The setting is already enabled. We have upgraded to tomcat version

<Host name="localhost" appBase="webapps"
            unpackWARs="true" autoDeploy="true">


From: Mark Thomas <>
Sent: 05 November 2015 17:07
To: Tomcat Users List
Subject: Re: Classloading performance problems, Tomcat 8 upgrade from tomcat 6

On 05/11/2015 16:58, Datta, Abir - Ealing wrote:
> Hi,
> Background
> Application server has been upgraded from tomcat 6 to tomcat 8. We are experiencingperformance
issues in transactions which involve XML processing using DOM4J and xerces api. The application
uses dom4j-1.6.1.jar and xercesImpl-2.10.0.jar. There has been no change in the application
which was deployed in tomcat 6 to the application deployed in tomcat 8.
> Problem
> We use Dynatrace to monitor our application. We have seen that in tomcat 8, the time
taken for classloading api has increased significantly, leading to performance degradation.
This tomcat 8 classloading time and api breakdown leading to classloading<>
shows the time taken by the classloading api in Tomcat 8 and this shows what was happening
in tomcat 6<>.
> From the above pics, we can see that Classloading is invoked from the xerces apis(Xml
Processing in the pic), so the transactions using the xerces api have shown performance degradation.
> Please help in understanding why the classloading times have increased in tomcat 8 and
how to get rid of this problem in tomcat8.

Try enabling unpackWARs.


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