From:
http://stackoverflow.com/questions/22331998/why-am-i-getting-nullpointerexceptions-in-my-jsps-when-i-upgrade-from-glassfish
I upgraded from Glassfish 3 to 4 and now my JSPs are throwing NPEs. I
haven't changed any code so it must be a difference in Glassfish. JSP code
that used to look like this:
<c:when test="${invoke}">
Now gives me a NPE unless I change it to this:
<c:when test="${not empty invoke && invoke}">
I'm wondering why this change is necessary. Can someone tell me what
caused this? Why did it used to work before and no longer works?
These NPEs only seem to occur in .tag files. I'm not sure if that's a
coincidence or relevant.
--
Thanks,
Dan
--
CONFIDENTIALITY NOTICE: The information contained in this electronic
transmission may be confidential. If you are not an intended recipient, be
aware that any disclosure, copying, distribution or use of the information
contained in this transmission is prohibited and may be unlawful. If you
have received this transmission in error, please notify us by email reply
and then erase it from your computer system.