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Clearing AEM’s JSP Cache in your Jenkins Build

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AEM really likes caching you compiled JSPs. This can be a problem as you are developing code, especially when working on dependencies. Every so often you may forget to include a dependency in a bundle or include the wrong version. Because of AEM’s JSP caching, even after fixing your dependency, you may see something like this:

AEM Caching JSP ErrorImage Credit: anthony from How to import a class from third party jar file in an OSGi component

As a developer, this is annoying, but if this same problem occurs on an integration or other environment, it causes significantly more extra work as the team will need to determine what is the problem and what caused it while having to potentially review many commits by different developers.

How to Clear AEM’s JSP Cache

To keep this from happening, you can automatically clear the JSP cache in AEM as part of your build. Apache Sling offers a simple console to do this at http://localhost:4502/system/console/slingjsp and you can easily invoke it with the following cURL command:
curl -u admin:admin 'http://localhost:4502/system/console/slingjsp' -X POST -v

Integration JSP Cache Clearing to the Build

To make this happen, add this as an additional Execute Shell build step in your build configuration. Given, this Jenkins build example:
Build Config
Your updated configuration should look like:
Build Configuration with JSP Cache Clearing
After adding this to your build you should see something like this:

[INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 01:20 min [INFO] Finished at: 2016-08-10T16:04:05+00:00 [INFO] Final Memory: 48M/192M [INFO] ------------------------------------------------------------------------ [finn] $ /bin/sh -xe /tmp/ + curl -u admin:PASSWORD -X POST -v * About to connect() to port 4502 (#0) * Trying IP... connected * Connected to ( port 4502 (#0) * Server auth using Basic with user 'admin' > POST /system/console/slingjsp HTTP/1.1 > Authorization: Basic CODE > User-Agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.19.1 Basic ECC zlib/1.2.3 libidn/1.18 libssh2/1.4.2 > Host: > Accept: */* > % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0< HTTP/1.1 302 Found < Date: Wed, 10 Aug 2016 16:04:05 GMT < Set-Cookie: felix-webconsole-locale=en;Path=/system/console;Expires=Tue, 05-Aug-2036 16:04:05 GMT < Expires: Thu, 01 Jan 1970 00:00:00 GMT < Location: < Content-Length: 0 < 0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0 0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0* Connection #0 to host left intact * Closing connection #0 Finished: SUCCESS

Hopefully, this helps anyone else running into problems with JSP caching in AEM. If you have any questions, leave a comment below!

Thoughts on “Clearing AEM’s JSP Cache in your Jenkins Build”

  1. While this is certainly a good tip, it is worth noting that doing this in a production environment may have a serious performance impact as all of those JSPs are going to be recompiled. It would be much better to do proper testing in lower environments to ensure that this never actually has to be done in production.

  2. Great clarification Justin! Agreed, this is definitely only something I would only recommend in a Development or Integration environment where you have the code churn to justify the performance impact.

  3. Hi,
    Should not this be an implicit step in production also.. I agree that it could have a performance impact but not having it would mean that outdated cached JSP being served by AEM..

  4. Dan,
    Thanks for the great post. Do you have higher rez versions of the images in your article? They are hard to read.

  5. Hi @Whitney, unfortunately, I don’t seem to have the original images, but here is the code I referenced:
    curl -u admin:PASSWORD -X POST -v

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Dan Klco, Adobe Digital Marketing Technical Director

Dan is a certified Adobe Digital Marketing Technologist, Architect, and Advisor, having led multiple successful digital marketing programs on the Adobe Experience Cloud. He's passionate about solving complex problems and building innovative digital marketing solutions. Dan is a PMC Member of the Apache Sling project, frequent Adobe Beta participant and committer to ACS AEM Commons, allowing a unique insight into the cutting edge of the Adobe Experience Cloud platform.

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