Major problem description
The code below throws a NullPointerException because vm.userAccount is null.
<tab label="test" visible="@load(vm.userAccount.groupFlag)" />
Steps to reproduce
- run the code below: vm.visible is null
<div viewModel="@id('vm')@init('support.issue.IssueVM')"> <label visible="@load(vm.visible)" value="text" /> </div>
public class IssueVM { private Boolean visible = null; public Boolean getVisible() { return visible; } }
actual result
java.lang.NullPointerException at org.zkoss.zk.ui.AbstractComponent$4.setValue(AbstractComponent.java:2852) at org.zkoss.zk.ui.AbstractComponent$4.setValue(AbstractComponent.java:2850) at org.zkoss.bind.impl.PropertyExpression.setValue(PropertyExpression.java:69) at org.zkoss.bind.impl.LoadPropertyBindingImpl.load(LoadPropertyBindingImpl.java:88) at org.zkoss.bind.impl.PropertyBindingHandler.doLoadBinding(PropertyBindingHandler.java:133) at org.zkoss.bind.impl.PropertyBindingHandler.doLoad(PropertyBindingHandler.java:334) at org.zkoss.bind.impl.BinderImpl.loadComponentProperties0(BinderImpl.java:2307) at org.zkoss.bind.impl.BinderImpl.loadComponent0(BinderImpl.java:2276) at org.zkoss.bind.impl.BinderImpl.loadComponent0(BinderImpl.java:2281) at org.zkoss.bind.impl.BinderImpl.loadComponent(BinderImpl.java:2215) at org.zkoss.bind.BindComposer$BinderKeeper$Loader.load(BindComposer.java:575) at org.zkoss.bind.BindComposer$BinderKeeper.loadComponentForAllBinders(BindComposer.java:551) at org.zkoss.bind.BindComposer.doAfterCompose(BindComposer.java:190) at org.zkoss.zk.ui.impl.UiEngineImpl.doAfterCompose(UiEngineImpl.java:588) at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:931) at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:877) at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:748) at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:822) at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:771) at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:709) at org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage0(UiEngineImpl.java:452) at org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage(UiEngineImpl.java:358) at org.zkoss.zk.ui.http.DHtmlLayoutServlet.process(DHtmlLayoutServlet.java:217)
debug info
- this issue doesn't happen in ZK 7
- 8.0.1.FL.20151015-Eval also has the issue.
Workaround
- use <if test="vm.mightBeNullVar"> instead
- visible="@load(!empty vm.visible and vm.visible)"
- relates to
-
ZK-3113 setting int property causes NPE
-
- Closed
-
