I have faced similar issue. problem is on Java 8.
On Thu, Jun 14, 2018, 8:12 PM Doug Breaux wrote:
>
>
> On 2018/05/22 18:24:34, bre...@us.ibm.com wrote:
> > Struts 2.5.14.1, WebSphere 8.5.5.13, IBM Java 8 (level 1.8.0_161) on AIX.
> >
> > We have a JSP with a plain element that works without
> issue when we switch WebSphere back to Java 7, but in Java 8 produces the
> following error:
> >
> > 2018-05-22 12:43:24,384 ERROR [freemarker.runtime]: error - Error
> executing FreeMarker template
> > FreeMarker template error:
> > Java method "AbstractCollection.size()" threw an exception when invoked
> on LinkedHashMap$LinkedKeySet object "[]"; see cause exception in the Java
> stack trace.
>
> FYI, after pursuing as IBM Java issue, it now appears to be an issue with
> a 3rd-party agent installed to the JVM, and am pursuing with them.
>
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