JSF2.0空白输入字段未设置为NULL [英] JSF2.0 Blank Input field in is not setting as NULL

问题描述

我有一个支持bean，其中filelds是Long，Double，Integer，String
当我没有在输入字段中指定任何内容时，它将Long，Integer和Double取为零而不是null。我正在使用tomcat来部署我的应用程序。有什么解决方案吗？我尝试了以下上下文参数，但它不起作用。

I have a backing bean where filelds are Long , Double , Integer , String When I am not specifying anything in input field it is taking as zero for Long, Integer and Double instead of null. I am using tomcat to deploy my app. Is there any solution? I have tried the following context parameter, but it does not work.

<context-param>
    <param-name>javax.faces.INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL</param-name>
    <param-value>true</param-value>
</context-param>

推荐答案

将以下VM参数添加到Tomcat启动选项。

Add the following VM argument to Tomcat startup options.

-Dorg.apache.el.parser.COERCE_TO_ZERO=false

您还需要确保您已声明 faces-config.xml 符合JSF 2.0规范。

You also need to ensure that you've declared faces-config.xml conform the JSF 2.0 specification.

<?xml version="1.0" encoding="UTF-8"?>
<faces-config
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd"
    version="2.0">
    <!-- Your config here -->
</faces-config>

否则将无法激活JSF 2.0特定设置/功能。

Otherwise JSF 2.0 specific settings/features won't be activated.

这篇关于JSF2.0空白输入字段未设置为NULL的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！