Enabling Cache Filter on Tomcat in Jasper 7.X

Environment details
Jasperserver Pro – 7.1.0
Apache Tomcat – 8.5.30

The purpose of enabling cache filter on tomcat is to cache static files such as images/CSS/javascript files, HTML files. This decreases the load on the tomcat server because the browser will first check the cache before requesting another static file.

To achieve the same in Jaspersoft 7.1.0, please follow the steps below –

1. Take the back up of applicationContext-webapp.xml from location

(Jasper Home)/WEB-INF/

2. Copy the provided applicationContext-webapp.xml to the location –

(Jasper Home)/WEB-INF/

3. Clear work and Temp directory
4. Restart the tomcat server.

Changed maxAge value for bean staticResourcesExpiresHeader from 365 days to 5 minutes.

Here values are given in seconds.

<bean id="staticResourcesExpiresHeader" p:maxAge="300" class="com.jaspersoft.jasperserver.war.httpheaders.JRSExpiresHeader" />

1. when executing jasper login URL in the browser for the first time-



2. Jasper UI loaded the second time –



3. When there is any change in the static files –
1. For this, we had made below change in js.config.properties file present inside (Jasper Home)/WEB-INF/

javascript.optimize = false

2. Restarted the tomcat server
3. Loaded jasper UI and took a screenshot of response header for jquery.jcrypton.js from the location (Jasper Home)/scripts/bower_components/jCrypton/ and captured its last modified



4. Later added an alert in the same file and saved.
5. Re-executed the jasper URL and taken the screenshot.

This concludes, the server is giving first preference to last modified files and then expire flag.

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Rupam Bhardwaj
Helical IT Solutions Pvt Ltd