抛出：IllegalArgumentException：无法将类型类org.omnifaces.el.E​​xpressionInspector $ ValueExpressionType的属性类java.lang.Boolean中

Question

我有一个在一流水平OmniFaces 1.11 <o:validateBean />的问题（http://showcase.omnifaces.org/validators/validateBean）

基本上，我试图验证使用根据两个按钮确认团组同一个bean我点击：

  <h:commandButton value="Mandatory"> 
       <o:validateBean value="#{testBean.pojo}" validationGroups="bo.ihm.beans.Mandatory" /> 
      </h:commandButton> 

      <h:commandButton value="Optional"> 
       <o:validateBean value="#{testBean.pojo}" validationGroups="javax.validation.groups.Default" /> 
      </h:commandButton> 

每当我点击一个按钮，我得到

GRAVE: Exception occured while doing validation. 
javax.el.ELException: /testOmnifaces.xhtml @21,74 value="#{testBean.pojo.forain}": java.lang.IllegalArgumentException: Cannot convert PROPERTY of type class org.omnifaces.el.ExpressionInspector$ValueExpressionType to class java.lang.Boolean 
    at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:114) 
    at org.omnifaces.el.ExpressionInspector.getValueReference(ExpressionInspector.java:43) 
    at org.omnifaces.taghandler.ValidateBean$6.invoke(ValidateBean.java:331) 
    at org.omnifaces.taghandler.ValidateBean$6.invoke(ValidateBean.java:326) 
    at org.omnifaces.util.Components$ForEach$1.visit(Components.java:508) 
    at org.omnifaces.util.Components$ForEach$TypesVisitCallback.visit(Components.java:573) 
    at com.sun.faces.component.visit.FullVisitContext.invokeVisitCallback(FullVisitContext.java:151) 
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1689) 
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700) 
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700) 
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700) 
    at javax.faces.component.UIForm.visitTree(UIForm.java:371) 
    at org.omnifaces.util.Components$ForEach.invoke(Components.java:541) 
    at org.omnifaces.util.Components$ForEach.invoke(Components.java:505) 
    at org.omnifaces.taghandler.ValidateBean.forEachInputWithMatchingBase(ValidateBean.java:326) 
    at org.omnifaces.taghandler.ValidateBean.access$400(ValidateBean.java:151) 
    at org.omnifaces.taghandler.ValidateBean$3.run(ValidateBean.java:286) 
    at org.omnifaces.taghandler.ValidateBean$ValidateBeanCallback.invoke(ValidateBean.java:430) 
    at org.omnifaces.util.Events$1.invoke(Events.java:278) 
    at org.omnifaces.util.Events$4.beforePhase(Events.java:312) 
    at org.omnifaces.eventlistener.CallbackPhaseListener.beforePhase(CallbackPhaseListener.java:63) 
    at com.sun.faces.lifecycle.Phase.handleBeforePhase(Phase.java:228) 
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:99) 
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198) 
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646) 
    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:696) 
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:521) 
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:138) 
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:564) 
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:213) 
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1097) 
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:448) 
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:175) 
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1031) 
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:136) 
    at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:200) 
    at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:109) 
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97) 
    at org.eclipse.jetty.server.Server.handle(Server.java:446) 
    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:271) 
    at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:246) 
    at org.eclipse.jetty.io.AbstractConnection$ReadCallback.run(AbstractConnection.java:358) 
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:601) 
    at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:532) 
    at java.lang.Thread.run(Thread.java:745) 
Caused by: javax.el.ELException: java.lang.IllegalArgumentException: Cannot convert PROPERTY of type class org.omnifaces.el.ExpressionInspector$ValueExpressionType to class java.lang.Boolean 
    at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:229) 
    at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109) 
    ... 44 more 
Caused by: java.lang.IllegalArgumentException: Cannot convert PROPERTY of type class org.omnifaces.el.ExpressionInspector$ValueExpressionType to class java.lang.Boolean 
    at com.sun.el.lang.ELSupport.coerceToBoolean(ELSupport.java:189) 
    at com.sun.el.lang.ELSupport.coerceToType(ELSupport.java:394) 
    at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:227) 
    ... 45 more 

testWithClassLevelValidation.xhtml：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
         "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:ui="http://xmlns.jcp.org/jsf/facelets" xmlns:f="http://xmlns.jcp.org/jsf/core" 
    xmlns:h="http://xmlns.jcp.org/jsf/html" xmlns:o="http://omnifaces.org/ui"> 

<f:metadata> 
    <f:viewAction action="#{testBean.init}" /> 
</f:metadata> 

<h:head> 
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> 
    <title>Test</title> 
</h:head> 

<h:body> 

    <h:form id="formaliteACCRE"> 
     <h:panelGrid columns="1" style="width: 100%;"> 
      <h:panelGrid columns="2" style="width: 100%; display: inline-block;"> 
       <h:outputLabel for="forain">Yes or No ?</h:outputLabel> 
       <h:selectBooleanCheckbox id="forain" value="#{testBean.pojo.forain}"> 
        <f:ajax execute="forain" render="groupeDomicile" /> 
       </h:selectBooleanCheckbox> 
      </h:panelGrid> 

      <h:panelGroup id="groupeDomicile"> 
       <h:outputText value="Yes" rendered="#{testBean.pojo.forain}" /> 
       <h:outputText value="No" rendered="#{not testBean.pojo.forain}" /> 
      </h:panelGroup> 

      <h:inputText id="numeroSecu" value="#{testBean.pojo.numeroSecuriteSociale}" maxlength="13" size="13" /> 
      <h:inputText id="numeroSecuCle" value="#{testBean.pojo.cleSecuriteSociale}" maxlength="2" size="3" /> 

      <h:panelGrid columns="2" style="width: 100%; display: inline-block;"> 
       <h:inputText id="mandatory" value="#{testBean.pojo.mandatory}" maxlength="13" size="13" /> 
       <h:outputText value="*" style="color:red;" /> 
      </h:panelGrid> 

      <f:ajax execute="@form" render="@form"> 

       <h:commandButton value="Mandatory"> 
        <o:validateBean value="#{testBean.pojo}" validationGroups="bo.ihm.beans.Mandatory" /> 
       </h:commandButton> 

       <h:commandButton value="Optional"> 
        <o:validateBean value="#{testBean.pojo}" validationGroups="javax.validation.groups.Default" /> 
       </h:commandButton> 
      </f:ajax> 
     </h:panelGrid> 

     <ui:remove> ################################################################################################ </ui:remove> 
     <ui:remove>        ===== MESSAGES D'ERREURS =====          </ui:remove> 
     <ui:remove> ################################################################################################ </ui:remove> 

     <h:panelGroup id="messagesErreur"> 
      <h:panelGrid class="dr-pnl" width="100%" rendered="#{not empty facesContext.messageList}"> 
       <h:messages style="color:red;" /> 
      </h:panelGrid> 
     </h:panelGroup> 
    </h:form> 
</h:body> 
</html> 

TestBean.java：

package bo.ihm.beans; 

import java.io.Serializable; 

import javax.faces.bean.ManagedBean; 
import javax.faces.bean.ViewScoped; 
import javax.validation.Valid; 

@ViewScoped 
@ManagedBean(name = "testBean") 
public class TestBean implements Serializable { 

    private static final long serialVersionUID = 1L; 

    @Valid 
    private Pojo pojo; 

    public Pojo getPojo() { 
     return pojo; 
    } 

    public void init() { 
     pojo = new Pojo(); 
     pojo.setNumeroSecuriteSociale("2531257351038"); 
     pojo.setCleSecuriteSociale("22"); 
    } 

    public void setPojo(final Pojo pPojo) { 
     this.pojo = pPojo; 
    } 
} 

Pojo.java：

package bo.ihm.beans; 

import org.hibernate.validator.constraints.NotEmpty; 

@NumeroSecuriteSociale 
public class Pojo { 

    private boolean forain; 
    private String cleSecuriteSociale; 
    private String numeroSecuriteSociale; 

    @NotEmpty(groups = Mandatory.class) 
    private String mandatory; 

    public String getCleSecuriteSociale() { 
     return cleSecuriteSociale; 
    } 

    public String getMandatory() { 
     return mandatory; 
    } 

    public String getNumeroSecuriteSociale() { 
     return numeroSecuriteSociale; 
    } 

    public boolean isForain() { 
     return forain; 
    } 

    public void setCleSecuriteSociale(final String pCleSecuriteSociale) { 
     cleSecuriteSociale = pCleSecuriteSociale; 
    } 

    public void setForain(final boolean pForain) { 
     forain = pForain; 
    } 

    public void setMandatory(final String pMandatory) { 
     mandatory = pMandatory; 
    } 

    public void setNumeroSecuriteSociale(final String pNumeroSecuriteSociale) { 
     numeroSecuriteSociale = pNumeroSecuriteSociale; 
    } 

    /* 
    * (non-Javadoc) 
    * 
    * @see java.lang.Object#toString() 
    */ 
    @Override 
    public String toString() { 
     final StringBuilder builder = new StringBuilder(); 
     builder.append("Pojo [forain="); 
     builder.append(forain); 
     builder.append(", cleSecuriteSociale="); 
     builder.append(cleSecuriteSociale); 
     builder.append(", numeroSecuriteSociale="); 
     builder.append(numeroSecuriteSociale); 
     builder.append(", mandatory="); 
     builder.append(mandatory); 
     builder.append("]"); 
     return builder.toString(); 
    } 
} 

的完整代码，请https://github.com/ErwanLeroux/Bo_ihm_test_omnifaces只需运行清洁码头：运行战争et去http://localhost:14080/bo_ihm/testWithClassLevelValidation.xhtml

第二页http://localhost:14080/bo_ihm/testWithoutClassLevelValidation.xhtml是她证明类级别约束不起作用，当我点击按钮时，我应该得到像这样的验证错误消息：'Pojo [forain = false，cleSecuriteSociale = 22，numeroSecuriteSociale = 2531257351038，强制=空]是无效'

Answer 1

事实证明，隐式EL强制正在造成这一切。我们传递内部值（如ValueExpressionType.PROPERTY和ValueExpressionType.METHOD）以指示EL表达式是表示属性（getter/setter）调用还是方法（动作）调用。然而，如果该值具有隐含的EL强制支持，如java.lang.Boolean，则该方法失败，EL将在其上隐式地转换一串"true"到布尔true。

由于OmniFaces 2.0用于分解<o:grapicImage value>中的EL表达式并提取任何EL方法参数，所以它们可以作为HTTP查询字符串参数进行转换和传递，这种传递内部值的方法表明EL表达式的种类。这就解释了为什么它在OmniFaces 1.x中仍能正常工作。

根据this commit，OmniFaces 2.2已经解决了这个问题。