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  • Apache setCharacterEncoding处的NullPointerException（UploadRequestWrapper.java:83）

Apache setCharacterEncoding处的NullPointerException（UploadRequestWrapper.java:83）

apache jsf

Apache setCharacterEncoding处的NullPointerException（UploadRequestWrapper.java:83）,apache,jsf,tomcat7,myfaces,trinidad,Apache,Jsf,Tomcat7,Myfaces,Trinidad,我试图使用trinidad fileupload（）组件将一个文件上传到服务器，但我得到了一个 setCharacterEncoding处的NullPointerException（UploadRequestWrapper.java:83） 在按下命令按钮时 我的XHTML文件包含： <?xml version="1.0" encoding="ISO-8859-1" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transiti

我试图使用trinidad fileupload（）组件将一个文件上传到服务器，但我得到了一个

setCharacterEncoding处的NullPointerException（UploadRequestWrapper.java:83）

在按下命令按钮时

我的XHTML文件包含：

<?xml version="1.0" encoding="ISO-8859-1" ?>
<!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:tr="http://myfaces.apache.org/trinidad" >
<ui:composition template="/WEB-INF/templates/BasicTemplate.xhtml">

    <ui:define name="content">
        <tr:form usesUpload="true">
            <tr:inputFile label="Upload:" valueChangeListener="#{myBackingBean.fileUploaded}"/>
            <tr:commandButton text="Begin"/>
        </tr:form>
    </ui:define>

    </ui:define>
</ui:composition>
</html>
WEB-INF/WEB.xml文件：

import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import javax.faces.event.ValueChangeEvent;
import org.apache.myfaces.trinidad.model.UploadedFile;

public class MyBackingBean{
    ...
    public void fileUploaded(ValueChangeEvent event){
        UploadedFile file = (UploadedFile) event.getNewValue();
        if (file != null){
            FacesContext context = FacesContext.getCurrentInstance();
            FacesMessage message = new FacesMessage(
                "Successfully uploaded file " + file.getFilename() +
                " (" + file.getLength() + " bytes)");
                context.addMessage(event.getComponent().getClientId(context), message);
                // Here's where we could call file.getInputStream()
        }
    }
}

<filter>
    <filter-name>trinidad</filter-name>
    <filter-class>org.apache.myfaces.trinidad.webapp.TrinidadFilter</filter-class
</filter>

<servlet>
    <servlet-name>faces</servlet-name>
    <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
</servlet>

<filter-mapping>
    <filter-name>trinidad</filter-name>
    <servlet-name>faces</servlet-name>
</filter-mapping>

Schwerwiegend: Servlet.service() for servlet [Faces Servlet] in context with path [/com.cargarantie.ws.claimshandler] threw exception [null] with root cause java.lang.NullPointerException
at org.apache.myfaces.trinidadinternal.config.upload.UploadRequestWrapper.setCharacterEncoding(UploadRequestWrapper.java:83)
at org.apache.myfaces.context.servlet.ServletExternalContextImpl.setRequestCharacterEncoding(ServletExternalContextImpl.java:581)
at javax.faces.context.ExternalContextWrapper.setRequestCharacterEncoding(ExternalContextWrapper.java:416)
at javax.faces.context.ExternalContextWrapper.setRequestCharacterEncoding(ExternalContextWrapper.java:416)
at javax.faces.application.ViewHandler.initView(ViewHandler.java:339)
at org.apache.myfaces.application.ViewHandlerImpl.initView(ViewHandlerImpl.java:191)
at javax.faces.application.ViewHandlerWrapper.initView(ViewHandlerWrapper.java:49)
at org.apache.myfaces.lifecycle.RestoreViewExecutor.doPrePhaseActions(RestoreViewExecutor.java:83)
at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:182)
at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:143)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:196)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
有什么想法吗？提前谢谢。

我解决了这个问题

我不知道这种方法是否是解决问题的最佳方法，但它是有效的

  • 创建自己的SetCharacterEncodingFilter类并将其添加到生成路径中

  • 在web.xml中注册过滤器并设置init参数

    <filter>
    <filter-name>UTFEncodingFilter</filter-name>
    <filter-class>path.to.your.package.SetCharacterEncodingFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>UTF-8</param-value>
    </init-param>
    <init-param>
        <param-name>ignore</param-name>
        <param-value>false</param-value>
    </init-param>
</filter>
    • 来源：

    import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import javax.faces.event.ValueChangeEvent;
import org.apache.myfaces.trinidad.model.UploadedFile;

public class MyBackingBean{
    ...
    public void fileUploaded(ValueChangeEvent event){
        UploadedFile file = (UploadedFile) event.getNewValue();
        if (file != null){
            FacesContext context = FacesContext.getCurrentInstance();
            FacesMessage message = new FacesMessage(
                "Successfully uploaded file " + file.getFilename() +
                " (" + file.getLength() + " bytes)");
                context.addMessage(event.getComponent().getClientId(context), message);
                // Here's where we could call file.getInputStream()
        }
    }
}

    <filter>
    <filter-name>trinidad</filter-name>
    <filter-class>org.apache.myfaces.trinidad.webapp.TrinidadFilter</filter-class
</filter>

<servlet>
    <servlet-name>faces</servlet-name>
    <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
</servlet>

<filter-mapping>
    <filter-name>trinidad</filter-name>
    <servlet-name>faces</servlet-name>
</filter-mapping>

    Schwerwiegend: Servlet.service() for servlet [Faces Servlet] in context with path [/com.cargarantie.ws.claimshandler] threw exception [null] with root cause java.lang.NullPointerException
at org.apache.myfaces.trinidadinternal.config.upload.UploadRequestWrapper.setCharacterEncoding(UploadRequestWrapper.java:83)
at org.apache.myfaces.context.servlet.ServletExternalContextImpl.setRequestCharacterEncoding(ServletExternalContextImpl.java:581)
at javax.faces.context.ExternalContextWrapper.setRequestCharacterEncoding(ExternalContextWrapper.java:416)
at javax.faces.context.ExternalContextWrapper.setRequestCharacterEncoding(ExternalContextWrapper.java:416)
at javax.faces.application.ViewHandler.initView(ViewHandler.java:339)
at org.apache.myfaces.application.ViewHandlerImpl.initView(ViewHandlerImpl.java:191)
at javax.faces.application.ViewHandlerWrapper.initView(ViewHandlerWrapper.java:49)
at org.apache.myfaces.lifecycle.RestoreViewExecutor.doPrePhaseActions(RestoreViewExecutor.java:83)
at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:182)
at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:143)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:196)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)