NEBA core tag library may not be found during JSP compilation even though it is registered

[olaf-otto]

Sometimes, for instance when a JSP was (manually) modified, the following error arises during JSP compilation:

File "tld:http://www.neba.io/core/1.0" not found

However, the tag library shows up in Sling's "JSP taglibs" status console: /system/console/status-jsptaglibs. This very likely related to Felix issues regarding fragment bundles.

As a workaround, the tag libraries could be moved to the API bundle and the dependencies to the core could be modeled as an OSGi service dependency, with the service interface provided by the API.

[olimination]

Quick workaround: Sometimes it helps to refresh the Fragment bundle in the Felix console directly, then mostly it works again.

[huberchrigu]

I wrote a little test application from scratch:

1. With NEBA 3.0.0 everything worked fine.
2. With NEBA 3.1.0 this issue appeared after every reinstallation of my application package. I needed to rest AEM every time to fix this. Also refreshing or stopping/starting any bundle did not work.
3. With NEBA 3.2.0-SNAPSHOT (locally compiled today), the issue always appears, even after an AEM restart!
   Caused by: org.apache.sling.scripting.jsp.jasper.JasperException: /apps/poll/templates/pollPage/body.jsp(1,1) The absolute uri: http://www.neba.io/core/1.0 cannot be resolved in either web.xml or the jar files deployed with this application

Btw, if you move the tld to api, you should also change the uri from .../core/1.0 to .../api/1.0, don't you think?

[olaf-otto]

Could you provide more details on your test scenario, i.e. AEM version / JDK etc? I cannot reproduce this issue with AEM 5.6.1 & JDK 1.7. I have tried this with two differenc customer projects, like so:

a) Uninstall and delete the precious NEBA package
b) restart the instance to make sure there are no classloading issues later on (Felix...)
c) install the 3.2 snapshot package and start the project bundles
d) delete /var/classes to force re-compilation of JSPs against the taglib change

Subsequently, I could no longer get the issue to occur - I've both modified single JSPs directly on the instance and re-deployed template packages. Both worked fine.

[huberchrigu]

With deleting /var/classes it worked with plain vanilla 5.6.1 and my poll app.