Major Steps to Reproduce
it's a simulated case, not a real one
<nodom viewModel="@id('vm')@init('issue.ZK5079VM')">
<forEach items="@init(vm.model)">
<apply template="nonExistedTemplate"/>
</forEach>
<button label="del" onClick="@command('del')"/>
</nodom>
<template name="noChildTemplate"></template>
1. click "del" button
another way
use <apply template="noChildTemplate"/>
Current Result
error from the simulated case
java.lang.NullPointerException
at org.zkoss.zk.ui.HtmlShadowElement$ChildIter.<init>(HtmlShadowElement.java:1403)
at org.zkoss.zk.ui.HtmlShadowElement$ChildIter.<init>(HtmlShadowElement.java:1382)
at org.zkoss.zk.ui.HtmlShadowElement$4.listIterator(HtmlShadowElement.java:1364)
at java.base/java.util.AbstractList.removeRange(AbstractList.java:595)
at java.base/java.util.AbstractList.clear(AbstractList.java:243)
at org.zkoss.zuti.zul.ForEachListDataListener.onListModelDataChange(ForEachListDataListener.java:99)
at org.zkoss.zuti.zul.ForEachListDataListener.onChange(ForEachListDataListener.java:47)
at org.zkoss.zul.AbstractListModel.fireEvent(AbstractListModel.java:73)
at org.zkoss.zul.ListModelList.remove(ListModelList.java:348)
at benchmark.NotifyListModelVM.del(NotifyListModelVM.java:30)
at jdk.internal.reflect.GeneratedMethodAccessor31.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.zkoss.bind.impl.ParamCall.call(ParamCall.java:174)
at org.zkoss.bind.impl.BinderImpl.handleNotifyChange(BinderImpl.java:1952)
at org.zkoss.bind.impl.BinderImpl.doExecute(BinderImpl.java:2131)
at org.zkoss.bind.impl.BinderImpl.doCommand(BinderImpl.java:1847)
at org.zkoss.bind.impl.BinderImpl.access$1300(BinderImpl.java:145)
at org.zkoss.bind.impl.BinderImpl$CommandEventListener.onEvent0(BinderImpl.java:1688)
at org.zkoss.bind.impl.BinderImpl$CommandEventListener.onEvent(BinderImpl.java:1641)
at org.zkoss.zk.ui.AbstractComponent.onEvent(AbstractComponent.java:3190)
at org.zkoss.zk.ui.AbstractComponent.service(AbstractComponent.java:3160)
at org.zkoss.zk.ui.AbstractComponent.service(AbstractComponent.java:3102)
error from the user
Caused by: java.lang.Null Pointer Exception: null at org.zkoss.zk.ui.HtmlShadowElement$ChildIter.<init>(HtmlShadowElement.java:1403) at org.zkoss.zk.ui.HtmlShadowElement$ChildIter.<init>(HtmlShadowElement.java:1382) at org.zkoss.zk.ui.HtmlShadowElement$4.listIterator(HtmlShadowElement.java:1364) at java.base/java.util.AbstractList.removeRange(AbstractList.java:595) at java.base/java.util.AbstractList.clear(AbstractList.java:243) at org.zkoss.zuti.zul.ForEachListDataListener.onListModelDataChange(ForEachListDataListener.java:99) at org.zkoss.zuti.zul.ForEachListDataListener.onChange(ForEachListDataListener.java:47) at org.zkoss.zul.AbstractListModel.fireEvent(AbstractListModel.java:73) at com.yyy.zk.components.viewmode.ListModelListExt.fireEvent(ListModelListExt.java:334) -->Allows delaying event, not used here at org.zkoss.zul.ListModelList.remove(ListModelList.java:348) at com.yyy.zk.components.viewmode.ListModelListExt.removeInternal(ListModelListExt.java:223) -->Simply super to remove at com.yyy.zk.components.viewmode.ListModelListExt.lambda$9(ListModelListExt.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.HashMap$ValueSpliterator.forEachRemaining(HashMap.java:1675) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at com.yyy.zk.components.viewmode.ListModelListExt.removeFromSubLists(ListModelListExt.java:471) at com.yyy.zk.components.viewmode.ListModelListExt.remove(ListModelListExt.java:204) at com.yyy.zk.ba.component.notification.NotifiedListModelListExt.remove(NotifiedListModelListExt.java:172) at com.yyy.zk.ba.component.notification.NotifiedListModelListExt.remove(NotifiedListModelListExt.java:1) at org.zkoss.zul.ListModelList.remove(ListModelList.java:355) at com.yyy.zk.ba.component.notification.NotifiedListModelListExt.lambda$7(NotifiedListModelListExt.java:383)
Expected Result
no error
Debug Information
- other places that call getShadowHostIfAny() check null, but ChildIter() doesn't check.
