Question

我想使用DynamicEntity http://www.eclipse.org/eclipselink/api/2.0/org/eclipse/persistence/dynamic/DynamicEntity.html 作为托管bean提供我的xhtml表单的属性。

当我使用上面作为我的xhtml页面的支持bean时，我得到以下异常：

The class 'com.invoice.Invoic' does not have the property 'sellerAddress'.
com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:111)
javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)
javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182)
javax.faces.component.UIOutput.getValue(UIOutput.java:169)
com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:205)
com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:355)
com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:164)
javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:1786)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782)
com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:402)
com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:125)
javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:288)
org.ocpsoft.rewrite.faces.RewriteViewHandler.renderView(RewriteViewHandler.java:186)
javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:288)
com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
org.ocpsoft.rewrite.servlet.RewriteFilter.doFilter(RewriteFilter.java:200)
com.tsystems.odx.idm.authentication.web.AuthenticationFilter.doFilter(AuthenticationFilter.java:231)
org.ocpsoft.rewrite.servlet.impl.HttpRewriteResultHandler.handleResult(HttpRewriteResultHandler.java:38)
org.ocpsoft.rewrite.servlet.RewriteFilter.rewrite(RewriteFilter.java:263)
org.ocpsoft.rewrite.servlet.RewriteFilter.doFilter(RewriteFilter.java:188)
com.tsystems.odx.idm.authentication.web.AuthenticationFilter.doFilter(AuthenticationFilter

我放了一个调试断点并查看了我的DynamicEntity对象，在那里有sellerAddress对象。

请帮我找出原因。

这是一个虚拟的例子，我想如何将DynamicEntity用作bean

package com.test.beans;

import java.io.InputStream;

import javax.annotation.PostConstruct;
import javax.enterprise.inject.Produces;
import javax.faces.bean.ViewScoped;
import javax.inject.Named;
import javax.xml.bind.JAXBException;

import org.eclipse.persistence.dynamic.DynamicEntity;
import org.eclipse.persistence.jaxb.dynamic.DynamicJAXBContext;
import org.eclipse.persistence.jaxb.dynamic.DynamicJAXBContextFactory;

@Named
@ViewScoped
public class CustomerHandler {

    DynamicJAXBContext jaxbContext;

    @PostConstruct
    public void init() throws JAXBException {
        InputStream xsdInputStream = getClass().getClassLoader().getResourceAsStream("customer.xsd");
        jaxbContext = DynamicJAXBContextFactory.createContextFromXSD(xsdInputStream, null, null,
                null);
    }

    @Produces
    @Named("Customer")
    public DynamicEntity createCustomer() {
        DynamicEntity customer = jaxbContext.newDynamicEntity("org.example.Customer");
        customer.set("name", "Jane Doe");
        DynamicEntity address = jaxbContext.newDynamicEntity("org.example.Address");
        address.set("street", "1 Any Street").set("city", "Any Town");
        customer.set("address", address);
        return customer;
    }

    public void save()
    {
        // do something
    }
}

customer.xsd文件位于src / main / resources

中

<xsd:schema 
   xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
   xmlns="http://www.example.org" 
   targetNamespace="http://www.example.org"
   elementFormDefault="qualified">

   <xsd:complexType name="address">
      <xsd:sequence>
         <xsd:element name="street" type="xsd:string" minOccurs="0"/>
         <xsd:element name="city" type="xsd:string" minOccurs="0"/>
      </xsd:sequence>
   </xsd:complexType>

   <xsd:element name="customer">
      <xsd:complexType>
         <xsd:sequence>
            <xsd:element name="name" type="xsd:string" minOccurs="0"/>
            <xsd:element name="address" type="address" minOccurs="0"/>
         </xsd:sequence>
      </xsd:complexType>
   </xsd:element>

</xsd:schema>

我的测试页面是customer.xhtml

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:ui="http://java.sun.com/jsf/facelets">

<h:head>
    <title>Welcome to Customer Page</title>
</h:head>

<h:body>
    <h:form>
        <h:inputText value="#{Customer.name}" />
        <h:inputText value="#{Customer.address.street}" />
        <h:commandButton value="Submit" action="#{customerHandler.save()}" />
    </h:form>   
</h:body>
</html>

Answer 1

DynamicEntity类的文档告诉我们它是一个接口，并且没有声明这个接口提供了好的旧POJO getter，如getSellerAddress()，它将返回所需的属性。当您尝试将值操作为#{Customer.name}时，确实不起作用，因为没有getName() / setName()方法对。

DynamicEntity接口公开的方法如下：

DynamicEntity#get(propertyName)检索值
DynamicEntity#set(propertyName, value)预设值。

因此，显然没有办法使用这些方法以标准JSF方式创建具有bean属性的双边绑定。

您有以下选择来处理您的问题：

切换到JPA并创建像@Entity public class Customer这样的真实实体作为您的模型。这显然是进一步发展和最佳实践的最佳方式;
为JSF表单创建占位符/支持bean以保留提交的值，并在操作方法中创建动态实体以进行进一步操作。请注意，如果您决定遵循此路线，您将错过JSF的所有要点;
很可能DynamicEntity的实现（即，从DynamicJAXBContext#newDynamicEntity(String n)调用返回的实例）由Map实现支持。调试以查看该调用返回的内容并将该信息应用于您的用例。如果它由具有名为persistentMap的公共getter / setter对的地图支持，则您的EL将变为#{Customer.persistentMap['name']。请注意，这是一种气馁的做法和紧密耦合的示例，如果有支持的集合的访问者，则可能会这样做。

总结一下，我强烈建议切换到JPA来解决你的用例。

JSF抛出类没有DynamicEntity的属性

1 个答案: