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Jan TošovskýDear All,

in my Service Builder module portlet (split into 'api', 'service' and 'web' parts) I have some util classes in 'api' portlet, but also one in the 'web' portlet. If the same package is used, that 'web' class becomes invisible:

2019-02-13 13:08:25.860 ERROR [http-nio-8080-exec-10][render_portlet_jsp:131] null
org.apache.jasper.JasperException: PWC6033: Error in Javac compilation for JSP__PWC6199: Generated servlet error:_cannot find symbol_  symbol:   class MyUtilClass_  location: package com.mycompany.myportlet.util__PWC6199: Generated servlet error:_view_jsp.java uses or overrides a deprecated API.__PWC6199: Generated servlet error:_Recompile with -Xlint:deprecation for details.__PWC6199: Generated servlet error:_view_jsp.java uses unchecked or unsafe operations.__PWC6199: Generated servlet error:_Recompile with -Xlint:unchecked for details.__ [Sanitized]

If that 'web' portlet package name is altered 'util' -> 'utilx', it works fine.

I find it is related to my 'api' portlet bnd.bnd exports settings:

Export-Package:\
    com.mycompany.myportlet.util

Now if that 'utilx' is also added into bnd.bnd, I am getting exactly same error as above:

Export-Package:\
com.mycompany.myportlet.util, \
com.mycompany.myportlet.utilx

The fix is apparent, not to share exported packages in the web part, but 'util' package is ideal in my case.

Is this behaviour documented somewhere?

It works best if you have a unique association of a package with a bundle: Don't add more classes to packages from other bundles.
Also, IMHO, a -web project should not really export functionality. If you need some functionality there that other bundles need as well, create a separate bundle. Alternatively add an interface to the api, the implementation to the service bundle. You can even make Util-classes proper services and depend only on their interfaces. Rarely if ever is there a necessity to import a concrete class from another bundle. The more you rely on interfaces for your dependencies, the better maintainable your system will be.