如何从资源文件读取属性以使用Java在JSF页面中显示错误消息值

Question

当我从资源lblFathersOrGuardianName文件中读取名称mysqlmaven.properties时，出现以下错误

Mar 04, 2014 2:53:21 PM com.sun.faces.application.ActionListenerImpl processAction
SEVERE: java.lang.ExceptionInInitializerError
javax.faces.el.EvaluationException: java.lang.ExceptionInInitializerError
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:98)
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:98)
    at javax.faces.component.UICommand.broadcast(UICommand.java:311)
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:781)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1246)
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:77)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:114)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:308)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.ExceptionInInitializerError
    at com.uk.mysqlmaven.jsf.beans.RegistrationBean.validationRegistration(RegistrationBean.java:198)
    at com.uk.mysqlmaven.jsf.beans.RegistrationBean.submitRegistrationAction(RegistrationBean.java:189)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.apache.el.parser.AstValue.invoke(AstValue.java:278)
    at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:274)
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:102)
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:84)
    ... 24 more
Caused by: java.lang.NullPointerException
    at java.util.ResourceBundle$CacheKey.calculateHashCode(ResourceBundle.java:593)
    at java.util.ResourceBundle$CacheKey.<init>(ResourceBundle.java:522)
    at java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1259)
    at java.util.ResourceBundle.getBundle(ResourceBundle.java:721)
    at com.uk.mysqlmaven.util.ResourceKeys.<init>(ResourceKeys.java:12)
    at com.uk.mysqlmaven.util.ResourceKeys.<clinit>(ResourceKeys.java:8)
    ... 34 more
Mar 04, 2014 2:53:21 PM com.sun.faces.lifecycle.InvokeApplicationPhase execute
WARNING: #{registrationBean.submitRegistrationAction}: java.lang.ExceptionInInitializerError
javax.faces.FacesException: #{registrationBean.submitRegistrationAction}: java.lang.ExceptionInInitializerError
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:114)
    at javax.faces.component.UICommand.broadcast(UICommand.java:311)
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:781)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1246)
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:77)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:114)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:308)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
Caused by: javax.faces.el.EvaluationException: java.lang.ExceptionInInitializerError
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:98)
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:98)
    ... 23 more
Caused by: java.lang.ExceptionInInitializerError
    at com.uk.mysqlmaven.jsf.beans.RegistrationBean.validationRegistration(RegistrationBean.java:198)
    at com.uk.mysqlmaven.jsf.beans.RegistrationBean.submitRegistrationAction(RegistrationBean.java:189)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.apache.el.parser.AstValue.invoke(AstValue.java:278)
    at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:274)
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:102)
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:84)
    ... 24 more
Caused by: java.lang.NullPointerException
    at java.util.ResourceBundle$CacheKey.calculateHashCode(ResourceBundle.java:593)
    at java.util.ResourceBundle$CacheKey.<init>(ResourceBundle.java:522)
    at java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1259)
    at java.util.ResourceBundle.getBundle(ResourceBundle.java:721)
    at com.uk.mysqlmaven.util.ResourceKeys.<init>(ResourceKeys.java:12)
    at com.uk.mysqlmaven.util.ResourceKeys.<clinit>(ResourceKeys.java:8)
    ... 34 more
javax.faces.FacesException: #{registrationBean.submitRegistrationAction}: java.lang.ExceptionInInitializerError
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:85)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:114)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:308)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
Caused by: javax.faces.FacesException: #{registrationBean.submitRegistrationAction}: java.lang.ExceptionInInitializerError
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:114)
    at javax.faces.component.UICommand.broadcast(UICommand.java:311)
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:781)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1246)
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:77)

    ... 19 more
Caused by: javax.faces.el.EvaluationException: java.lang.ExceptionInInitializerError
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:98)
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:98)
    ... 23 more
Caused by: java.lang.ExceptionInInitializerError
    at com.uk.mysqlmaven.jsf.beans.RegistrationBean.validationRegistration(RegistrationBean.java:198)
    at com.uk.mysqlmaven.jsf.beans.RegistrationBean.submitRegistrationAction(RegistrationBean.java:189)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.apache.el.parser.AstValue.invoke(AstValue.java:278)
    at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:274)
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:102)
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:84)
    ... 24 more
Caused by: java.lang.NullPointerException
    at java.util.ResourceBundle$CacheKey.calculateHashCode(ResourceBundle.java:593)
    at java.util.ResourceBundle$CacheKey.<init>(ResourceBundle.java:522)
    at java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1259)
    at java.util.ResourceBundle.getBundle(ResourceBundle.java:721)
    at com.uk.mysqlmaven.util.ResourceKeys.<init>(ResourceKeys.java:12)
    at com.uk.mysqlmaven.util.ResourceKeys.<clinit>(ResourceKeys.java:8)
    ... 34 more

mysqlmaven.properties

#registration.xhtml
lblFirstName=First Name
lblMiddleName=Middle Name
lblLastName=Last Name
lblDateOfBirth=Date Of Birth
lblFathersOrGuardianName=Father's / Guardian Name

RegistrationBean.java

package com.uk.mysqlmaven.jsf.beans;

import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import javax.faces.event.ActionEvent;

import com.uk.mysqlmaven.util.ResourceKeys;

public class RegistrationBean {

    private String fathersOrGuardianName;

    public String getFathersOrGuardianName() {
        return fathersOrGuardianName;
    }

    public void setFathersOrGuardianName(String fathersOrGuardianName) {
        this.fathersOrGuardianName = fathersOrGuardianName;
    }

    public String submitRegistrationAction() {
        if (validationRegistration()) {
            return "views/home.faces?faces-redirect=true&param=98";
        } else {
            return "";
        }
    }

    public Boolean validationRegistration() {
        if (this.fathersOrGuardianName.length() == 0) {
            FacesContext.getCurrentInstance().addMessage(fathersOrGuardianName, new FacesMessage(FacesMessage.SEVERITY_ERROR, ResourceKeys.getInstance().get("lblFathersOrGuardianName"), "Fathers/GurdianName can't be empty."));
        }
        return Boolean.FALSE;
    }

    public void clearRegistrationAction(ActionEvent event) {
        this.fathersOrGuardianName = "";
    }

}

ResourceKeys.java

package com.uk.mysqlmaven.util;


import java.util.ResourceBundle;

public class ResourceKeys {

private static ResourceKeys instance = new ResourceKeys();
private final ResourceBundle resourceBundle;

private ResourceKeys() { 
    resourceBundle = ResourceBundle.getBundle(BUNDLE_NAME);
}

/**
 * Return singleton instance of this class
 * @return singleton instance
 */
public synchronized static ResourceKeys  getInstance() {
    return instance;
}

private static String BUNDLE_NAME = "/MySqlMavenJSF/com/uk/mysqlmaven/resources/mysqlmaven";

/**
 * Return value of the key
 * @param key
 * @return value
 */
public String get(String key) {
    return resourceBundle.getString(key);
}

}

如何从Java资源文件中获取名称。mysqlmaven.properties文件放置在我的项目中，如下面的屏幕快照所示。

Answer 1

mysqlmaven.properties文件路径无法在ResourceKeys.java文件中访问。为了从Java中的properties访问package文件，我在Constants.java中的路径下面使用了此代码。

Constants.java

package com.uk.mysqlmaven.util; public class Constants { public class Resources { public static final String BUNDLENAME_MYSQLMAVEN = "com.uk.mysqlmaven.resources.mysqlmaven"; } }
ResourceKeys.java
package com.uk.mysqlmaven.util; import java.util.Locale; import java.util.ResourceBundle; import javax.faces.context.FacesContext; public class ResourceKeys { private static ResourceKeys instance = new ResourceKeys(); private ResourceBundle resourceBundle; private ResourceKeys() { } /** * Return singleton instance of this class * @return singleton instance */ public synchronized static ResourceKeys getInstance() { return instance; } /** * Return value of the key * @param key * @param bundleName * @return value */ public String get(String key, String bundleName) { Locale locale = FacesContext.getCurrentInstance().getViewRoot().getLocale(); resourceBundle = ResourceBundle.getBundle(bundleName, locale); return resourceBundle.getString(key); } }
RegistrationBean.java
package com.uk.mysqlmaven.jsf.beans; import javax.faces.application.FacesMessage; import javax.faces.context.FacesContext; import javax.faces.event.ActionEvent; import com.uk.mysqlmaven.util.Constants; import com.uk.mysqlmaven.util.ResourceKeys; public class RegistrationBean { private String fathersOrGuardianName; public String getFathersOrGuardianName() { return fathersOrGuardianName; } public void setFathersOrGuardianName(String fathersOrGuardianName) { this.fathersOrGuardianName = fathersOrGuardianName; } public String submitRegistrationAction() { if (validationRegistration()) { return "views/home.faces?faces-redirect=true&param=98"; } else { return ""; } } public Boolean validationRegistration() { if (this.fathersOrGuardianName.length() == 0) { String commonName = ResourceKeys.getInstance().get("lblPleaseEnter", Constants.Resources.BUNDLENAME_MYSQLMAVEN); String displayName = ResourceKeys.getInstance().get("lblFathersOrGuardianName", Constants.Resources.BUNDLENAME_MYSQLMAVEN); FacesContext.getCurrentInstance().addMessage(fathersOrGuardianName, new FacesMessage(FacesMessage.SEVERITY_ERROR, commonName +" "+ displayName , "Fathers/GurdianName can't be empty.")); } return Boolean.FALSE; } public void clearRegistrationAction(ActionEvent event) { this.fathersOrGuardianName = ""; } }
Registration.xhtml
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:ui="http://java.sun.com/jsf/facelets" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core" xmlns:p="http://primefaces.org/ui"> <f:view> <h:head> <title>Registration</title> <f:loadBundle var="mysqlmaven" basename="com.uk.mysqlmaven.resources.mysqlmaven" /> <h:outputStylesheet name="style/mysqlmaven.css"></h:outputStylesheet> </h:head> <h:form id="registrationForm"> <table align="center"> <tr> <td><h:panelGrid> <h:messages id="registrationMessageId" errorClass="lblRed" warnClass="lblWarning" infoClass="lblGreen"></h:messages> <h:message for="registrationMessageId"></h:message> </h:panelGrid> <h:panelGrid columns="1" cellpadding="2" frame="hsides" border="0"> <h:panelGrid columns="2"> <h:panelGroup> <p:outputLabel value="*" styleClass="lblRed"></p:outputLabel> <p:outputLabel value="#{mysqlmaven.lblFathersOrGuardianName}"></p:outputLabel> <p:inputText id="fathersOrGuardianNameId" label="#{mysqlmaven.lblFathersOrGuardianName}" value="#{registrationBean.fathersOrGuardianName}"></p:inputText> </h:panelGroup> </h:panelGrid> </h:panelGrid> <h:panelGrid columns="2"> <p:commandButton id="submitId" value="Submit" title="Submit" actionListener="#{registrationBean.submitRegistrationAction}" update="registrationMessageId"></p:commandButton> <p:commandButton id="clearId" value="Clear" actionListener="#{registrationBean.clearRegistrationAction}"></p:commandButton> </h:panelGrid> </td> </tr> </table> </h:form> </f:view> </html>

如何从资源文件读取属性以使用Java在JSF页面中显示错误消息值

问题描述投票：0回答：1

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最新问题

如何从资源文件读取属性以使用Java在JSF页面中显示错误消息值

问题描述 投票：0回答：1

1个回答

最新问题

问题描述投票：0回答：1