com.sun.faces.renderkit.html_basic.MenuRenderer createCollection：无法为类型java.util.Arrays创建新的Collection实例$ ArrayList [英] com.sun.faces.renderkit.html_basic.MenuRenderer createCollection: Unable to create new Collection instance for type java.util.Arrays$ArrayList

问题描述

我想使用带有枚举的JSF / SelectManyCheckBox标记：

I'm trying to use JSF / SelectManyCheckBox tag with an enum :

这是我的xhtml代码：

Here is my xhtml code :

            <h:form id="searchForm">
                <h:panelGrid columns="2">
                    <h:outputText value="Searched queues" />
                    <h:panelGroup>
                        <h:selectManyCheckbox layout="pageDirection" value="#{jmsErrorController.errorSearchCriteria.searchedQueues}" converter="queueConverter">
                            <f:selectItems value="#{jmsErrorController.completeQueueList}" />
                        </h:selectManyCheckbox>
                    </h:panelGroup>
                </h:panelGrid>
                <h:commandButton action="#{jmsErrorController.search}"
                    value="Search !" />
            </h:form>

我已经在另一篇文章中添加了转换器。

I've add a converter as stated in an other post.

它似乎工作正常，但我看到这个堆栈跟踪在控制台：

It seems to work fine but I see this stack trace on the console :

28-Jun-2013 09:07:46 com.sun.faces.renderkit.html_basic.MenuRenderer createCollection
SEVERE: Unable to create new Collection instance for type java.util.Arrays$ArrayList
java.lang.InstantiationException: java.util.Arrays$ArrayList
at java.lang.Class.newInstance0(Class.java:340)
at java.lang.Class.newInstance(Class.java:308)
at com.sun.faces.renderkit.html_basic.MenuRenderer.createCollection(MenuRenderer.java:907)
at com.sun.faces.renderkit.html_basic.MenuRenderer.convertSelectManyValuesForModel(MenuRenderer.java:367)
at com.sun.faces.renderkit.html_basic.MenuRenderer.convertSelectManyValue(MenuRenderer.java:129)
at com.sun.faces.renderkit.html_basic.MenuRenderer.getConvertedValue(MenuRenderer.java:315)
at javax.faces.component.UIInput.getConvertedValue(UIInput.java:1030)
at javax.faces.component.UIInput.validate(UIInput.java:960)
at javax.faces.component.UIInput.executeValidate(UIInput.java:1233)
at javax.faces.component.UIInput.processValidators(UIInput.java:698)
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1214)
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1214)
at javax.faces.component.UIForm.processValidators(UIForm.java:253)
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1214)
at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1172)
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:593)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.doIt(WebAppServletContext.java:3684)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3650)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2268)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2174)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1446)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)

在这个堆栈跟踪之后，工作正常，但我不知道为什么会有这样的stacktrace ..

After this stacktrace, the application seems to work fine but I wonder why is there such a stacktrace..

有人可以帮助我吗？

Stéphane。

推荐答案

$ c> UISelectMany 组件的值是使用 Arrays＃asList（） method而不是 new ArrayList（） 。

This will happen when the UISelectMany component's value being provided is created using Arrays#asList() method instead of new ArrayList().

如果模型 value 已经预填充，JSF将尝试以使用完全相同的类型将提交的值放入并设置新的模型值。但是， Arrays＃asList（）返回的 java.util.Arrays $ ArrayList c $ c> java.util.Arrays 类，而不是如 new Array $ ArrayList（）中可单独实例化。因此这个异常。

If a model value is already prepopulated, JSF will try to use exactly the same type to put submitted values in and set the new model value. However, the java.util.Arrays$ArrayList type as returned by Arrays#asList() is internal to java.util.Arrays class and not individually instantiable as in new Arrays$ArrayList(). Hence this exception.

要解决这个问题，请确保使用 new ArrayList（）创建该值。

To fix this, make sure that the value is created using new ArrayList().

或者，通过 collectionType 属性显式指定集合类型，如在这个紧密相关的答案中所指示的：org.hibernate.LazyInitializationException at com.sun.faces.renderkit.html_basic.MenuRenderer .convertSelectManyValuesForModel 。

Alternatively, explicitly specify the collection type via collectionType attribute as instructed in this closely related answer: org.hibernate.LazyInitializationException at com.sun.faces.renderkit.html_basic.MenuRenderer.convertSelectManyValuesForModel.

<h:selectManyCheckbox ... collectionType="java.util.ArrayList">

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