ZK @ModelAttribute is null

Question

asked 2013-11-06 21:41:00 +0800

I'm new to Spring with ZK Studio and I'm encountering the following problem, please help me.

I have a web project that use jsp and works fine but when I try to use a forms zul of Zk Studio doesn´t works.

The problem occurs when i want to save the data. When I work in jsp the @ModelAttribute has data, but when I change to zul in the servlet the @ModelAttribute is null. Thank you very much.

This is the controller code:

@Controller
public class C_ILCD_LANGUAGESController extends SelectorComposer<Component>  {

    private static final long serialVersionUID = 1;

    @Autowired
    private C_ILCD_LANGUAGESService c_ilcd_languagesService;

    @RequestMapping("/index")
    public String setupFrom(Map<String, Object> map){
        C_ILCD_LANGUAGES c_ilcd_languages = new C_ILCD_LANGUAGES();
        map.put("c_ilcd_languages", c_ilcd_languages);
        map.put("c_ilcd_languagesList", c_ilcd_languagesService.getAllC_ILCD_LANGUAGES());
        return "c_ilcd_languages";
    }

    @RequestMapping(value="/addLanguage", method=RequestMethod.POST)
    public String addLanguage(@ModelAttribute C_ILCD_LANGUAGES c_ilcd_languages, BindingResult result, Map<String, Object> map){
        C_ILCD_LANGUAGES c_ilcd_languagesResult = new C_ILCD_LANGUAGES();
        c_ilcd_languagesService.add(c_ilcd_languages);
        c_ilcd_languagesResult = c_ilcd_languages;

        map.put("c_ilcd_languages", c_ilcd_languagesResult);
        map.put("c_ilcd_languagesList", c_ilcd_languagesService.getAllC_ILCD_LANGUAGES());
        return "c_ilcd_languages";
    }   
}

This is the jsp code (that works fine):

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<%@ include file="/WEB-INF/jsp/includes.jsp"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>C_ILCD_LANGUAGES Management</title>
</head>
<body>
<h1>C_ILCD_LANGUAGES Data</h1>
<form:form action="addLanguage" method="POST" commandName="c_ilcd_languages">
    <table>
        <tr>
            <td>Languages ID</td>
            <td><form:input path="LID" /></td>
        </tr>
        <tr>
            <td>VALUE</td>
            <td><form:input path="LVALUE" /></td>
        </tr>
        <tr>
            <td>DEFINITION</td>
            <td><form:input path="LDEFINITION" /></td>
        </tr>
        <tr>
            <td>DBT_ID</td>
            <td><form:input path="LDBTID" /></td>
        </tr>
        <tr>
            <td colspan="2">
                <input type="submit" name="action" value="Add" />
            </td>
        </tr>
    </table>
</form:form>
<br>
    <table border="1">
        <th>Languages ID</th>
        <th>VALUE</th>
        <th>DEFINITION</th>
        <th>DBT_ID</th>
        <c:forEach items="${c_ilcd_languagesList}" var="c_ilcd_languages">
            <tr>
                <td>${c_ilcd_languages.LID}</td>
                <td>${c_ilcd_languages.LVALUE}</td>
                <td>${c_ilcd_languages.LDEFINITION}</td>
                <td>${c_ilcd_languages.LDBTID}</td>
            </tr>
        </c:forEach>
    </table>
</body>
</html>

This is the servlet code:

<?xml version="1.0" encoding="UTF-8"?>
    <context:annotation-config />
    <context:component-scan base-package="com.foo.WebMexicaniuhEE" />   


    <bean id="propertyConfigurer"
        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"
        p:location="/WEB-INF/jdbc.properties" />

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
        destroy-method="close" p:driverClassName="${jdbc.driverClassName}"
        p:url="${jdbc.databaseurl}" p:username="${jdbc.username}" p:password="${jdbc.password}" />
    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="configLocation">
            <value>classpath:hibernate.cfg.xml</value>
        </property>
        <property name="configurationClass">
            <value>org.hibernate.cfg.AnnotationConfiguration</value>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">${jdbc.dialect}</prop>
                <prop key="hibernate.show_sql">true</prop>
            </props>
        </property>
    </bean>

    <context:component-scan base-package="com.foo.WebMexicaniuhEE.controller, org.zkoss.spring.beans.zkcomponents"></context:component-scan>

    <bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <property name="prefix" value="/WEB-INF/zul/"/>
        <property name="suffix" value=".zul"/>
    </bean>
    <tx:annotation-driven />
    <bean id="transactionManager"
        class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean> 
</beans>

This is the zul code:

<zk xmlns:n="native">
    <window apply="com.foo.WebMexicaniuhEE.controller.C_ILCD_LANGUAGESController">

        <n:form action="addLanguage" method="post" modelAttribute="c_ilcd_languages">
            <textbox id="txtLID1" value="@bind(c_ilcd_languages.LID)" width="30px"></textbox>
            <textbox id="txtLVALUE1" value="@bind(c_ilcd_languages.LVALUE)" width="150px"></textbox>
            <textbox id="txtLDEFINITION1" value="@bind(c_ilcd_languages.LDEFINITION)" width="150px"></textbox>
            <textbox id="txtLDBTID1" value="@bind(c_ilcd_languages.LDBTID)" width="30px"></textbox>
            <button label="Add" type="submit"/>
        </n:form>

        <grid id="gridLanguages" model="@bind(com.foo.WebMexicaniuhEE.model)" mold="paging" pageSize="10">
            <columns>
                <column label="LID" />
                <column label="LVALUE" />
                <column label="LDEFINITION" />
                <column label="LDBTID" />
            </columns>
            <rows>
                <row forEach="${c_ilcd_languagesList}">
                    <label value="${each.LID}"/>
                    <label value="${each.LVALUE}"/>
                    <label value="${each.LDEFINITION}"/>
                    <label value="${each.LDBTID}"/>
                </row>
            </rows>
          </grid> 
    </window>
</zk>

This is the web.xml code:

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.4" > 

    <description><![CDATA[My ZK Application]]></description>
    <display-name>MexicaniuhEE</display-name>

    <context-param>
        <param-name>log4jConfigLocation</param-name>
        <param-value>classpath:log4j.xml</param-value>
    </context-param>

    <listener>
        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
    </listener>

    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!-- ZK -->
    <listener>
        <description>ZK listener for session cleanup</description>
        <listener-class>org.zkoss.zk.ui.http.HttpSessionListener</listener-class>
    </listener>
    <servlet>
        <description>ZK loader for ZUML pages</description>
        <servlet-name>zkLoader</servlet-name>
        <servlet-class>org.zkoss.zk.ui.http.DHtmlLayoutServlet</servlet-class>
        <init-param>
            <param-name>update-uri</param-name>
            <param-value>/zkau</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup><!-- Must -->
    </servlet>
    <servlet-mapping>
        <servlet-name>zkLoader</servlet-name>
        <url-pattern>*.zul</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>zkLoader</servlet-name>
        <url-pattern>*.zhtml</url-pattern>
    </servlet-mapping>
    </servlet>

    <servlet>
    <servlet-name>default</servlet-name>
    <servlet-class>org.mortbay.jetty.servlet.DefaultServlet</servlet-class>
    <init-param>
      <param-name>useFileMappedBuffer</param-name>
      <param-value>false</param-value>
    </init-param>
    <load-on-startup>0</load-on-startup>
  </servlet>
    <servlet-mapping>
        <servlet-name>auEngine</servlet-name>
        <url-pattern>/zkau/*</url-pattern>
    </servlet-mapping>

    <!-- [Optional] Session timeout -->
    <session-config>
        <session-timeout>60</session-timeout>
    </session-config>

    <welcome-file-list>
        <welcome-file>index.zul</welcome-file>
        <welcome-file>index.zhtml</welcome-file>
        <welcome-file>index.html</welcome-file>
        <welcome-file>index.htm</welcome-file>
    </welcome-file-list>
</web-app>

Answer 1

answered 2013-11-08 10:48:42 +0800

cor3000
6280 ● 2 ● 7

Hi,

you are mixing different things here. A ZK Composer is something different than a Spring MVC Controller, so think it doesn't make any sense to mix them.

When using this

<n:form action="addLanguage" method="post" modelattribute="c_ilcd_languages">

it is just writing a native html form, I think the modelAttribute-attribute is simply ignored when posting a form.

When posting the form, you'll completely leave the ZK lifecycle, and just post to the MVC Dispatcher servlet.

I am even wondering how anything else on the page could work (like: @bind(cilcdlanguages.LID)) do you actually get any value out of it?

I also don't see any DelegatingVariableResolver configured...

Please refer to this document how to communicate between ZK and Spring.

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