Infinite recursion in Unbind

The issue occurs in a custom tag when it tries to render a Tag cloud.

main page=
            #{displayAreaCloud listOfMap:postsByArea, as:'normal' /}

displayTagCloud=
#{if _listOfMap}
 #{list items:_listOfMap, as:'tag'}
    <a href="@{Application.listTagged(tag.get('tag'))}"
class="tag_${tag.get('pound')}">${tag.get('tag')}
(${tag.get('pound')})</a>
 #{/list}
#{/if}

(Note : this is similar to the Blog play sample application)

I tried to collect as much details as I could, hope it will help

The StackTrace :

play.exceptions.TemplateExecutionException:
java.lang.OutOfMemoryError: Java heap space
 at play.templates.Template.throwException(Template.java:295)
 at play.templates.Template.render(Template.java:260)
 at play.mvc.results.RenderTemplate.<init>(RenderTemplate.java:22)
 at play.mvc.Controller.renderTemplate(Controller.java:435)
 at play.mvc.Controller.render(Controller.java:467)
 at controllers.Application.index(Application.java:24)
 at play.utils.Java.invokeStatic(Java.java:129)
 at play.mvc.ActionInvoker.invoke(ActionInvoker.java:138)
 at Invocation.HTTP Request(Play!)
Caused by: java.lang.RuntimeException: java.lang.OutOfMemoryError:
Java heap space
 at play.templates.Template.throwException(Template.java:302)
 at play.templates.Template.render(Template.java:260)
 at play.templates.Template$ExecutableTemplate.invokeTag(Template.java:393)
 at /app/views/Application/index.html.(line:52)
 at play.templates.Template.render(Template.java:237)
 ... 7 more
Caused by: java.lang.OutOfMemoryError: Java heap space
 at java.util.Arrays.copyOf(Arrays.java:2882)
 at java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:100)
 at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:390)
 at java.lang.StringBuilder.append(StringBuilder.java:119)
 at play.data.binding.Unbinder.unBind(Unbinder.java:53)
 at play.data.binding.Unbinder.unBind(Unbinder.java:57)
 at play.data.binding.Unbinder.unBind(Unbinder.java:47)
 at play.data.binding.Unbinder.unBind(Unbinder.java:57)
 at play.data.binding.Unbinder.unBind(Unbinder.java:57)
 at play.data.binding.Unbinder.unBind(Unbinder.java:47)
 at play.data.binding.Unbinder.unBind(Unbinder.java:57)
 at play.data.binding.Unbinder.unBind(Unbinder.java:57)
 at play.data.binding.Unbinder.unBind(Unbinder.java:47)
 at play.data.binding.Unbinder.unBind(Unbinder.java:57)
 at play.data.binding.Unbinder.unBind(Unbinder.java:57)
 at play.data.binding.Unbinder.unBind(Unbinder.java:47)
 at play.data.binding.Unbinder.unBind(Unbinder.java:57)
 at play.data.binding.Unbinder.unBind(Unbinder.java:57)
 at play.data.binding.Unbinder.unBind(Unbinder.java:47)
 at play.data.binding.Unbinder.unBind(Unbinder.java:57)
 at play.data.binding.Unbinder.unBind(Unbinder.java:57)
 at play.data.binding.Unbinder.unBind(Unbinder.java:47)
 at play.data.binding.Unbinder.unBind(Unbinder.java:57)
 at play.data.binding.Unbinder.unBind(Unbinder.java:57)
 at play.data.binding.Unbinder.unBind(Unbinder.java:47)
 at play.data.binding.Unbinder.unBind(Unbinder.java:57)
 at play.data.binding.Unbinder.unBind(Unbinder.java:57)
 at play.data.binding.Unbinder.unBind(Unbinder.java:47)
 at play.data.binding.Unbinder.unBind(Unbinder.java:57)
 at play.data.binding.Unbinder.unBind(Unbinder.java:57)
 at play.data.binding.Unbinder.unBind(Unbinder.java:47)
 at play.data.binding.Unbinder.unBind(Unbinder.java:57)