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From breaux@us.ibm.com <bre...@us.ibm.com>
Subject s:fielderror not working in Java 8, WebSphere
Date Tue, 22 May 2018 18:24:34 GMT
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 <s:fielderrors /> 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.

----
FTL stack trace ("~" means nesting-related):
        - Failed at: #assign eKeysSize = eKeys.size()  [in template "template/simple/fielderror.ftl"
at line 23, column 5]
----

Java stack trace (for programmers):
----
freemarker.core._TemplateModelException: [... Exception message was already printed; see it
above ...]
        at freemarker.ext.beans._MethodUtil.newInvocationTemplateModelException(_MethodUtil.java:289)
        at freemarker.ext.beans._MethodUtil.newInvocationTemplateModelException(_MethodUtil.java:252)
        at freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:74)
        at freemarker.core.MethodCall._eval(MethodCall.java:65)
        at freemarker.core.Expression.eval(Expression.java:81)
        at freemarker.core.Assignment.accept(Assignment.java:134)
        at freemarker.core.Environment.visit(Environment.java:326)
        at freemarker.core.Environment.visit(Environment.java:332)
        at freemarker.core.Environment.visit(Environment.java:332)
        at freemarker.core.Environment.process(Environment.java:305)
        at freemarker.template.Template.process(Template.java:378)
        at org.apache.struts2.components.template.FreemarkerTemplateEngine.renderTemplate(FreemarkerTemplateEngine.java:149)
        at org.apache.struts2.components.UIBean.mergeTemplate(UIBean.java:579)
        at org.apache.struts2.components.UIBean.end(UIBean.java:535)
        at org.apache.struts2.views.jsp.ComponentTagSupport.doEndTag(ComponentTagSupport.java:39)
.. my JSP
..
Caused by: java.lang.AbstractMethodError: java/util/AbstractCollection.size()I
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:90)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
        at java.lang.reflect.Method.invoke(Method.java:508)
        at freemarker.ext.beans.BeansWrapper.invokeMethod(BeansWrapper.java:1487)
        at freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:69)

Does anyone know what could be the cause of this?

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