NullPointerException during resolvment of nested EL expression for custom
component attribute
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Key: EXTVAL-102
URL: https://issues.apache.org/jira/browse/EXTVAL-102
Project: MyFaces Extensions Validator
Issue Type: Bug
Components: Core
Affects Versions: 2.0.3
Environment: Mojarra 2.0.2
Reporter: Tom M.
Priority: Critical
Attachments: TestProject.war
Origin:
http://markmail.org/message/fo4q5mbbcrzsumed?q=list:org%2Eapache%2Emyfaces%2Eusers
Hi,
the following NPE occured using Myfaces ExtVal:
java.lang.NullPointerException at
javax.faces.component.UIComponent.getValueExpression(UIComponent.java:338) at
com.sun.faces.el.CompositeComponentAttributesELResolver$ExpressionEvalMap.getExpression(CompositeComponentAttributesELResolver.java:314)
at
org.apache.myfaces.extensions.validator.core.el.ExtValELResolver.getCompositeComponentExpression(ExtValELResolver.java:277)
at
org.apache.myfaces.extensions.validator.core.el.DefaultELHelper.getPropertyDetailsOfValueBinding(DefaultELHelper.java:169)
at
org.apache.myfaces.extensions.validator.core.metadata.extractor.DefaultComponentMetaDataExtractor.extract(DefaultComponentMetaDataExtractor.java:77)
at
org.apache.myfaces.extensions.validator.core.interceptor.AbstractValidationInterceptor.getPropertyInformation(AbstractValidationInterceptor.java:176)
at
org.apache.myfaces.extensions.validator.core.interceptor.AbstractValidationInterceptor.processAfterValidation(AbstractValidationInterceptor.java:166)
at
org.apache.myfaces.extensions.validator.core.interceptor.AbstractValidationInterceptor.beforeGetConvertedValue(AbstractValidationInterceptor.java:153)
at
org.apache.myfaces.extensions.validator.core.renderkit.ExtValRendererWrapper.getConvertedValue(ExtValRendererWrapper.java:369)
at javax.faces.component.UIInput.getConvertedValue(UIInput.java:1008) at
javax.faces.component.UIInput.validate(UIInput.java:934) at
javax.faces.component.UIInput.executeValidate(UIInput.java:1189) at
javax.faces.component.UIInput.processValidators(UIInput.java:691) at
javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1080)
at
javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1080)
at javax.faces.component.UIForm.processValidators(UIForm.java:243) at
javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1080)
at
javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1080)
at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1180) at
com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:76)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) at
com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) at
javax.faces.webapp.FacesServlet.service(FacesServlet.java:312)
I used the following code:
===
Page:
===
<ui:composition template="/resources/templates/test-template.xhtml">
<ui:define name="test-workspace">
<ui:remove> a) works <parts-test:nestedCC myValue="#{personBean.person}"/> b)
works <parts-test:nestedCC
myValue="#{personBean.person.adresse}"/> </ui:remove>
c) NPE!!! <parts-test:nestedCC myValue="#{personBean.person.adresse.plz}"/>
</ui:define>
</ui:composition>
===
CustomComponent:
===
<composite:interface> <composite:attribute name="myValue" required="true" />
</composite:interface>
<composite:implementation>
<ui:remove> a) works <h:inputText id="theValue"
value="#{cc.attrs.myValue.adresse.plz}"
/> b) works <h:inputText id="theValue"
value="#{cc.attrs.myValue.plz}" /> </ui:remove>
c) NPE!!! <h:inputText id="theValue" value="#{cc.attrs.myValue}" />
</composite:implementation>
The code behind the scenes is: - a managed bean "PersonBean" - ...which refers
to an object "Person" which refers to an object "Adresse"
which has a string property "plz" - for testing purposes I implemented some
get/setPlz in PersonBean and Person
too which provide the value stored in Adresse.plz
In case c), using a deeply nested EL expression, the NPE occurs.
In the ExtVal code I found in
org.apache.myfaces.extensions.validator.core.el.DefaultELHelper.getPropertyDetailsOfValueBinding(UIComponent):
@ToDo(value = Priority.HIGH, description = "check if it works with nested
composite components")
Is this TODO still an open one or is the EL expression revealing a new bug?
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