get(source) failed on instance of com.founder.mp.apublish.businesspojo.impl.ArticleImpl
The problematic instruction:
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==> if nowarticle.source?exists [on line 236, column 19 in zjrb/neirong.mht]
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Java backtrace for programmers:
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freemarker.template.TemplateModelException: get(source) failed on instance of com.founder.mp.apublish.businesspojo.impl.ArticleImpl
	at freemarker.ext.beans.BeanModel.get(BeanModel.java:223)
	at freemarker.core.Dot._getAsTemplateModel(Dot.java:76)
	at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
	at freemarker.core.BuiltIn$existsBI._getAsTemplateModel(BuiltIn.java:636)
	at freemarker.core.BuiltIn$existsBI.isTrue(BuiltIn.java:647)
	at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:77)
	at freemarker.core.Environment.visit(Environment.java:208)
	at freemarker.core.MixedContent.accept(MixedContent.java:92)
	at freemarker.core.Environment.visit(Environment.java:208)
	at freemarker.core.Environment.process(Environment.java:188)
	at freemarker.template.Template.process(Template.java:237)
	at com.founder.mp.apublish.plan.FreeMarkerProcessor.process(FreeMarkerProcessor.java:89)
	at com.founder.mp.apublish.plan.impl.ArticlePublishPlan.run(ArticlePublishPlan.java:82)
	at com.founder.mp.apublish.plan.impl.PagePublishPlan.run(PagePublishPlan.java:59)
	at com.founder.mp.apublish.plan.impl.PeriodPublishPlan.run(PeriodPublishPlan.java:40)
	at com.founder.mp.apublish.task.impl.PublishPeriodTask.publish(PublishPeriodTask.java:30)
	at com.founder.mp.apublish.task.impl.PublishPeriodTask.runIt(PublishPeriodTask.java:47)
	at com.founder.mp.apublish.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:711)
	at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.GeneratedMethodAccessor39.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at freemarker.ext.beans.BeansWrapper.invokeMethod(BeansWrapper.java:835)
	at freemarker.ext.beans.BeanModel.invokeThroughDescriptor(BeanModel.java:276)
	at freemarker.ext.beans.BeanModel.get(BeanModel.java:183)
	... 18 more
Caused by: java.lang.OutOfMemoryError: Java heap space