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https://issues.apache.org/jira/browse/FREEMARKER-24?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15713339#comment-15713339
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Daniel Dekany commented on FREEMARKER-24:
-----------------------------------------
Yes, it's caused by that JDK bug (it's also pointed out in the comments of the
SourceForge page you have linked).
It's likely that FM would benefit from an own introspector (as a configuration
option). Users often ran into problems because the Java Beans rules aren't
relaxed enough for the purposes of FM. Like, {{Boolean isFoo()}} is not a bean
property getter, {{getXCode()}} is not accessibly as {{bean.xCode}}, only as
{{bean.XCode}}, and such. Also {{java.bean.Introspector}} is not accessible on
Android. So an own introspector could solve those, and the default method issue
too.
> Support of default methods in object model
> ------------------------------------------
>
> Key: FREEMARKER-24
> URL: https://issues.apache.org/jira/browse/FREEMARKER-24
> Project: Apache Freemarker
> Issue Type: Improvement
> Components: engine
> Affects Versions: 2.3.24-incubating
> Reporter: Emmanuel Keller
> Priority: Minor
>
> The default object method model currently does not support default methods:
> https://docs.oracle.com/javase/tutorial/java/IandI/defaultmethods.html
> Here is the current error:
> {noformat}
> FTL stack trace ("~" means nesting-related):
> - Failed at: #if task.switchable [in template "...../home.ftl" at line
> 43, column 25]
> ----
> at
> freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:131)
> at
> freemarker.core.UnexpectedTypeException.newDesciptionBuilder(UnexpectedTypeException.java:77)
> at
> freemarker.core.UnexpectedTypeException.<init>(UnexpectedTypeException.java:40)
> at
> freemarker.core.NonBooleanException.<init>(NonBooleanException.java:44)
> at freemarker.core.Expression.modelToBoolean(Expression.java:142)
> at freemarker.core.Expression.evalToBoolean(Expression.java:125)
> at freemarker.core.Expression.evalToBoolean(Expression.java:110)
> at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:46)
> at freemarker.core.Environment.visit(Environment.java:324)
> at freemarker.core.MixedContent.accept(MixedContent.java:54)
> at
> freemarker.core.Environment.visitByHiddingParent(Environment.java:345)
> at
> freemarker.core.IteratorBlock$IterationContext.executeNestedBlockInner(IteratorBlock.java:240)
> at
> freemarker.core.IteratorBlock$IterationContext.executeNestedBlock(IteratorBlock.java:220)
> at
> freemarker.core.IteratorBlock$IterationContext.accept(IteratorBlock.java:194)
> at freemarker.core.Environment.visitIteratorBlock(Environment.java:572)
> at freemarker.core.IteratorBlock.acceptWithResult(IteratorBlock.java:78)
> at freemarker.core.IteratorBlock.accept(IteratorBlock.java:64)
> at freemarker.core.Environment.visit(Environment.java:324)
> at freemarker.core.MixedContent.accept(MixedContent.java:54)
> at freemarker.core.Environment.visit(Environment.java:324)
> at freemarker.core.Environment.process(Environment.java:302)
> at freemarker.template.Template.process(Template.java:325)
> at com.qwazr.tools.FreeMarkerTool.template(FreeMarkerTool.java:86)
> at com.qwazr.tools.FreeMarkerTool.template(FreeMarkerTool.java:101)
> {noformat}
> To reproduce this.
> 1. Use an interface
> {code:java}
> public interface UpdatableTask extends Runnable {
> default boolean isSwitchable() {
> return false;
> }
> }
> {code}
> 2. Use an object that implements this interface with the following template:
> {code}
> <#if task.switchable>
> ...
> </#if>
> {code}
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