java javax.el.PropertyNotWritableException: /index.xhtml @29,118 value="": 设置操作的非法语法
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javax.el.PropertyNotWritableException: /index.xhtml @29,118 value="": Illegal Syntax for Set Operation
提问by Body
I want to create a login screen with localization option to translate the name and when i change from the default English to Arabic it crash
我想创建一个带有本地化选项的登录屏幕来翻译名称，当我从默认的英语更改为阿拉伯语时它会崩溃
here is the faces.config.xml
这是faces.config.xml
<?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">
<application>
<locale-config>
<default-locale>en</default-locale>
<supported-locale>ar</supported-locale>
</locale-config>
<resource-bundle>
<base-name>mypack.enar</base-name>
<var>msg</var>
</resource-bundle>
</application>
</faces-config>
ManagedBean
托管Bean
import java.io.Serializable;
import java.util.LinkedHashMap;
import java.util.Locale;
import java.util.Map;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import javax.faces.context.FacesContext;
import javax.faces.event.ValueChangeEvent;
/**
*
* @author body
*/
@ManagedBean(name = "localize")
@RequestScoped
public class LocalizeMBean implements Serializable {
/**
* @return the countries
*/
public static Map<String, Object> getCountries() {
return countries;
}
/**
* @param aCountries the countries to set
*/
public static void setCountries(Map<String, Object> aCountries) {
countries = aCountries;
}
private String localeCode;
/**
* Creates a new instance of LocalizeMBean
*/
public void setLocaleCode(String localeCode) {
this.localeCode = localeCode;
}
public Map<String, Object> getCountriesInMap() {
return getCountries();
}
public String getLocaleCode() {
return localeCode;
}
private static Map<String, Object> countries;
static {
setCountries(new LinkedHashMap<String, Object>());
getCountries().put("English", Locale.ENGLISH); //label, value
getCountries().put("Arabic", Locale.UNICODE_LOCALE_EXTENSION);
}
public void countryLocaleCodeChanged(ValueChangeEvent e) {
String newLocaleValue = e.getNewValue().toString();
//loop country map to compare the locale code
for (Map.Entry<String, Object> entry : getCountries().entrySet()) {
if (entry.getValue().toString().equals(newLocaleValue)) {
FacesContext.getCurrentInstance()
.getViewRoot().setLocale((Locale) entry.getValue());
}
}
}
}
JSF page
JSF页面
<h:head>
<title>My Login Page</title>
<h:outputStylesheet library="mycss" name="login-box.css"/>
</h:head>
<h:body>
<h:form>
<div style="padding: 100px 0 0 250px;">
<div id="login-box">
<H2>Login</H2>
My Login Screen
<br />
<h:selectOneMenu value="#{localize.localeCode}" onchange="submit();"
valueChangeListener="#{localize.countryLocaleCodeChanged}">
<f:selectItems value="#{localize.countriesInMap}" />
</h:selectOneMenu>
<br />
<div id="login-box-name" style="margin-top:20px;">
<h:outputLabel value="#{msg.namee}" />
</div>
<div id="login-box-field" style="margin-top:20px;">
<h:inputText styleClass="form-login" title="Username" value="" size="30" maxlength="2048" />
</div>
<div id="login-box-name">Password:</div><div id="login-box-field"><h:inputSecret styleClass="form-login" title="Password" value="" size="30" maxlength="2048" /></div>
<br />
<div class="login-box-options"><h:selectBooleanCheckbox value="1"/>Remember me<h:commandLink style="margin-left:30px;" value="Forget Password"/></div>
<br />
<br />
<h:commandButton styleClass="button"/>
</div>
</div>
</h:form>
</h:body>
</html>
The Exception when i change in the combobox
我在组合框中更改时的异常
javax.faces.component.UpdateModelException: javax.el.PropertyNotWritableException: /index.xhtml @29,118 value="": Illegal Syntax for Set Operation
at javax.faces.component.UIInput.updateModel(UIInput.java:853)
at javax.faces.component.UIInput.processUpdates(UIInput.java:735)
at javax.faces.component.UIForm.processUpdates(UIForm.java:281)
at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1242)
at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1242)
at javax.faces.component.UIViewRoot.processUpdates(UIViewRoot.java:1231)
at com.sun.faces.lifecycle.UpdateModelValuesPhase.execute(UpdateModelValuesPhase.java:78)
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 org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:722)
Caused by: javax.el.PropertyNotWritableException: /index.xhtml @29,118 value="": Illegal Syntax for Set Operation
at com.sun.faces.facelets.el.TagValueExpression.setValue(TagValueExpression.java:136)
at javax.faces.component.UIInput.updateModel(UIInput.java:818)
... 38 more
回答by BalusC
Please carefully read the exception message. The answer is straight in there.
请仔细阅读异常信息。答案就在那里。
javax.el.PropertyNotWritableException: /index.xhtml @29,118 value="": Illegal Syntax for Set Operation
javax.el.PropertyNotWritableException: /index.xhtml @29,118 value="": 设置操作的非法语法
At line 29, character 118 of /index.xhtmlyou've a value="". This is not a valid syntax for an EL value expression which should be writable through a setter method.
在第 29 行，/index.xhtml您的第118 个字符有一个value="". 这不是 EL 值表达式的有效语法，它应该可以通过 setter 方法写入。
Normally, you specify the value attribute like so value="#{bean.property}"wherein the bean has a getProperty()and a setProperty()method conform javabeans specification.
通常，您可以像这样指定 value 属性，value="#{bean.property}"其中 bean 具有符合 javabeans 规范getProperty()的setProperty()方法。
It's likely this one:
大概是这个：
<h:inputText styleClass="form-login" title="Username" value="" size="30" maxlength="2048" />
I'm not sure why you specified the value like that. This is plain wrong. You should either remove it altogether
我不确定你为什么指定这样的值。这是完全错误的。你应该完全删除它
<h:inputText styleClass="form-login" title="Username" size="30" maxlength="2048" />
or bind it to a valid bean property
或将其绑定到有效的 bean 属性
<h:inputText styleClass="form-login" title="Username" value="#{someBean.userName}" size="30" maxlength="2048" />
Please note that this problem has nothingto do with changing the JSF locale.
请注意，此问题与更改 JSF 语言环境无关。
Unrelatedto the concrete problem, nesting forms is illegalin HTML and therefore also in JSF. You should split the language selection and the user login over 2 separate forms. You don't want to submit the login data when you change the language. Further, you may find the hints in this answer helpful as to how to properly change the JSF locale: Localization in JSF, how to remember selected locale per session instead of per request/view
与具体问题无关，嵌套表单在 HTML 中是非法的，因此在 JSF 中也是如此。您应该将语言选择和用户登录拆分为 2 个单独的表单。您不想在更改语言时提交登录数据。此外，您可能会发现此答案中的提示对如何正确更改 JSF 语言环境很有帮助：JSF 中的本地化，如何记住每个会话而不是每个请求/视图选择的语言环境
