当我尝试通过 Eclipse 做一个非常简单的 JSF 应用程序时,我的 JBoss 日志中出现了一个奇怪的错误。所以我创建了一个简单的场景来询问我是否遗漏了我的 JSF 示例中的一些基本内容。或者,我怀疑我的特定工具或环境中可能存在错误配置或错误。
我创建了一个非常简单的 JSF 应用程序。它只是一个 JSF html 页面 (hello.jsp),它通过 ManagedBean 收集名称并转换到第二个 JSF html 页面 (ok.jsp)。该 bean 有 1 个 getter、1 个 setter 和 1 个操作方法 (addContact)。
我没有使用注释,只是一个简单的 faces-config.xml 文件,其中包含一个 ManagedBean 条目和一个导航规则。bean 名为“contact”,类为“com.mbeans.ContactBean”。我相信映射是正确的。
我通过 Eclipse Juno SR2 使用 JBoss 7.1。这是一个 JSF 2.0 应用程序。我已经为 Juno 加载了最新的 JBoss Tools 4.0。
该应用程序仅包含以下文件:
web.xml
faces-config.xml
ContactBean.java
hello.jsp
ok.jsp
文件内容如下。但我将添加一些关于它们是如何通过 Eclipse 创建的颜色评论(您可能想略过或忽略):
我进入 Eclipse 并创建一个新项目。我选择具有以下设置的“动态 Web 项目”:
目标运行时 = JBoss 7.1 运行时
配置 = JBoss 7.1 运行时的动态配置
生成一个 web.xml = CHECKED
我右键单击 WebContent 并创建一个新的 JSP 文件(文件名 = hello.jsp)。我使用 JSP 模板 = 新 JSF 页面 (html)。
我添加了几行表示访问名为“contact”的 ManagedBean 的简单表单,因此 hello.jsp 如下所示:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="f" uri="http://java.sun.com/jsf/core"%>
<%@ taglib prefix="h" uri="http://java.sun.com/jsf/html"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Add Contact</title>
</head>
<body>
<f:view>
<h2>Add Contact</h2>
<h:form>
Name:<br>
<h:inputText value="#{contact.name}" />
<h:commandButton value="Add Contact"
action="#{contact.addContact}" type="submit" />
</h:form>
</f:view>
</body>
</html>
同样,我添加以下 JSP 文件 (ok.jsp):
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="f" uri="http://java.sun.com/jsf/core"%>
<%@ taglib prefix="h" uri="http://java.sun.com/jsf/html"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>OK - Added New Contact</title>
</head>
<body>
<f:view>
<p>
The address for
<h:outputText value="#{contact.name}" />
was successfully added.
</p>
</f:view>
</body>
</html>
我右键单击项目(JSFTest)并添加一个具有以下设置的类:
包 = com.mbeans
名称 = ContactBean
我编辑了这个类,如下所示:
package com.mbeans;
public class ContactBean {
public ContactBean() {super();}
String name;
public String getName() {return name;}
public void setName(String name) {this.name = name;}
public String addContact() {
System.out.println("Name: " + getName());
return "success";
}
}
然后我右键单击 WEB-INF 文件夹并选择New->Other->JBoss Tools Web->JSF->Faces Config
以下设置:
文件夹:* = /JSFTest
名称:* = faces-config
版本:2.0
在 web.xml 中注册 = CHECKED
在新创建的 faces-config.xml 中,我右键单击Managed Beans->New->Managed Bean...
并设置以下内容:
范围=应用
类:* = com.mbeans.ContactBean
名称:* = contactBean
然后我右键单击Navigation Rules->New->Rule ...
并将对话框留空并单击Finish
。
我右键单击"[any]"->New->Case...
并设置以下内容:
从结果:=成功
来自行动:= #{contact.addContact}
ToView ID:* = /ok.jsp
最后,这会在 WEB-INF 文件夹中生成以下 faces-config.xml 文件:
<?xml version="1.0"?>
<faces-config version="2.0" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xi="http://www.w3.org/2001/XInclude"
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">
<managed-bean>
<managed-bean-name>contact</managed-bean-name>
<managed-bean-class>com.mbeans.ContactBean</managed-bean-class>
<managed-bean-scope>application</managed-bean-scope>
</managed-bean>
<navigation-rule>
<navigation-case>
<from-action>#{contact.addContact}</from-action>
<from-outcome>success</from-outcome>
<to-view-id>/ok.jsp</to-view-id>
</navigation-case>
</navigation-rule>
</faces-config>
然后我右键单击 hello.jsp 并选择Run As->Run On Server
我选择了 JBoss 7.1 Runtime Server(它是唯一的一个)。服务器启动成功。(我知道这个 JBoss 服务器正确地运行 Eclipse 之外的其他东西。)
我收到 500 错误,特别是,我在日志中看到以下消息,我认为这是问题的根源:
23:33:08,612 ERROR [org.jboss.web] (MSC service thread 1-3) JBAS018211: Could not load JSF managed bean class: com.mbeans.ContactBean
我认为 NullPointerException 可能是由与上述错误消息无关的其他错误引起的。我最关心的是上面的错误。但是,如果有人能指出我清除此 NullPointerException 的错误,我将不胜感激,以便消除它。以前我在没有 NPE 的情况下得到了一个不同的 500 错误,但日志中仍然有那个 JBAS018211。换句话说,我认为 NPE 很烦人但无关紧要。
完整的日志是:
23:33:06,543 INFO [org.jboss.modules] JBoss Modules version 1.1.1.GA
23:33:06,761 INFO [org.jboss.msc] JBoss MSC version 1.0.2.GA
23:33:06,824 INFO [org.jboss.as] JBAS015899: JBoss AS 7.1.1.Final "Brontes" starting
23:33:07,636 INFO [org.xnio] XNIO Version 3.0.3.GA
23:33:07,638 INFO [org.jboss.as.server] JBAS015888: Creating http management service using socket-binding (management-http)
23:33:07,647 INFO [org.xnio.nio] XNIO NIO Implementation Version 3.0.3.GA
23:33:07,655 INFO [org.jboss.remoting] JBoss Remoting version 3.2.3.GA
23:33:07,678 INFO [org.jboss.as.logging] JBAS011502: Removing bootstrap log handlers
23:33:07,686 INFO [org.jboss.as.configadmin] (ServerService Thread Pool -- 26) JBAS016200: Activating ConfigAdmin Subsystem
23:33:07,689 INFO [org.jboss.as.clustering.infinispan] (ServerService Thread Pool -- 31) JBAS010280: Activating Infinispan subsystem.
23:33:07,717 INFO [org.jboss.as.security] (ServerService Thread Pool -- 44) JBAS013101: Activating Security Subsystem
23:33:07,725 INFO [org.jboss.as.naming] (ServerService Thread Pool -- 38) JBAS011800: Activating Naming Subsystem
23:33:07,749 INFO [org.jboss.as.security] (MSC service thread 1-10) JBAS013100: Current PicketBox version=4.0.7.Final
23:33:07,749 INFO [org.jboss.as.webservices] (ServerService Thread Pool -- 48) JBAS015537: Activating WebServices Extension
23:33:07,752 INFO [org.jboss.as.osgi] (ServerService Thread Pool -- 39) JBAS011940: Activating OSGi Subsystem
23:33:07,789 INFO [org.jboss.as.connector] (MSC service thread 1-7) JBAS010408: Starting JCA Subsystem (JBoss IronJacamar 1.0.9.Final)
23:33:07,797 INFO [org.jboss.as.naming] (MSC service thread 1-4) JBAS011802: Starting Naming Service
23:33:07,825 INFO [org.jboss.as.mail.extension] (MSC service thread 1-12) JBAS015400: Bound mail session [java:jboss/mail/Default]
23:33:07,844 INFO [org.jboss.as.connector.subsystems.datasources] (ServerService Thread Pool -- 27) JBAS010403: Deploying JDBC-compliant driver class org.h2.Driver (version 1.3)
23:33:07,971 INFO [org.jboss.ws.common.management.AbstractServerConfig] (MSC service thread 1-7) JBoss Web Services - Stack CXF Server 4.0.2.GA
23:33:07,982 INFO [org.apache.coyote.http11.Http11Protocol] (MSC service thread 1-5) Starting Coyote HTTP/1.1 on http--127.0.0.1-7070
23:33:08,341 INFO [org.jboss.as.connector.subsystems.datasources] (MSC service thread 1-1) JBAS010400: Bound data source [java:jboss/datasources/ExampleDS]
23:33:08,352 INFO [org.jboss.as.server.deployment.scanner] (MSC service thread 1-4) JBAS015012: Started FileSystemDeploymentService for directory /usr/local/jboss-as-7.1.1.Final/standalone/deployments
23:33:08,358 INFO [org.jboss.as.server.deployment.scanner] (DeploymentScanner-threads - 1) JBAS015003: Found JSFTest.war in deployment directory. To trigger deployment create a file called JSFTest.war.dodeploy
23:33:08,360 INFO [org.jboss.as.remoting] (MSC service thread 1-10) JBAS017100: Listening on /127.0.0.1:9999
23:33:08,362 INFO [org.jboss.as.remoting] (MSC service thread 1-3) JBAS017100: Listening on /127.0.0.1:4447
23:33:08,475 INFO [org.jboss.as.server.deployment] (MSC service thread 1-12) JBAS015876: Starting deployment of "JSFTest.war"
23:33:08,612 ERROR [org.jboss.web] (MSC service thread 1-3) JBAS018211: Could not load JSF managed bean class: com.mbeans.ContactBean
23:33:08,792 INFO [javax.enterprise.resource.webcontainer.jsf.config] (MSC service thread 1-10) Initializing Mojarra 2.1.7-jbossorg-1 (20120227-1401) for context '/JSFTest'
23:33:09,663 INFO [org.hibernate.validator.util.Version] (MSC service thread 1-10) Hibernate Validator 4.2.0.Final
23:33:09,805 INFO [org.jboss.web] (MSC service thread 1-10) JBAS018210: Registering web context: /JSFTest
23:33:09,818 INFO [org.jboss.as] (MSC service thread 1-2) JBAS015951: Admin console listening on http://127.0.0.1:9990
23:33:09,819 INFO [org.jboss.as] (MSC service thread 1-2) JBAS015874: JBoss AS 7.1.1.Final "Brontes" started in 3541ms - Started 172 of 249 services (76 services are passive or on-demand)
23:33:09,873 INFO [org.jboss.as.server] (DeploymentScanner-threads - 2) JBAS018559: Deployed "JSFTest.war"
23:33:29,683 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/JSFTest].[jsp]] (http--127.0.0.1-7070-1) Servlet.service() for servlet jsp threw exception: java.lang.NullPointerException
at javax.faces.webapp.UIComponentClassicTagBase.setJspId(UIComponentClassicTagBase.java:1858) [jboss-jsf-api_2.1_spec-2.0.1.Final.jar:2.0.1.Final]
at org.apache.jsp.hello_jsp._jspx_meth_f_005fview_005f0(hello_jsp.java:103)
at org.apache.jsp.hello_jsp._jspService(hello_jsp.java:78)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) [jbossweb-7.0.13.Final.jar:]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final]
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369) [jbossweb-7.0.13.Final.jar:]
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:326) [jbossweb-7.0.13.Final.jar:]
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:253) [jbossweb-7.0.13.Final.jar:]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) [jbossweb-7.0.13.Final.jar:]
at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153) [jboss-as-web-7.1.1.Final.jar:7.1.1.Final]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368) [jbossweb-7.0.13.Final.jar:]
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [jbossweb-7.0.13.Final.jar:]
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671) [jbossweb-7.0.13.Final.jar:]
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930) [jbossweb-7.0.13.Final.jar:]
at java.lang.Thread.run(Unknown Source) [rt.jar:1.7.0_17]
而已。那就是问题所在。
(顺便说一句,Eclipse 也不显示 JSF 的悬停标记描述。HTML 标记是可以的。这让我想知道是否存在一些更深层次的 JBoss 工具配置错误。)
感谢您花时间审查我的问题。