Java JSP&;EL与JSF 1.x actionListener冲突
我正在处理一个JSF1.x示例,它在JSP中有一些EL冲突。 行Java JSP&;EL与JSF 1.x actionListener冲突,java,jsp,jsf,el,jsf-1.2,Java,Jsp,Jsf,El,Jsf 1.2,我正在处理一个JSF1.x示例,它在JSP中有一些EL冲突。 行actionListener=“#{helloBean.addControls}正在解决一个问题 错误是: HTTP Status 500 - /JSP/hello.jsp (line: 37, column: 2) A literal value was specified for attribute actionListener that is defined as a deferred method with a return
actionListener=“#{helloBean.addControls}
正在解决一个问题
错误是:
HTTP Status 500 - /JSP/hello.jsp (line: 37, column: 2) A literal value was specified for attribute actionListener that is defined as a deferred method with a return type of void. JSP.2.3.4 does not permit literal values in this case
我的项目描述如下:
包结构:
<?xml version="1.0"?>
<!DOCTYPE faces-config PUBLIC
"-//Sun Microsystems, Inc.//DTD JavaServer Faces Config 1.0//EN"
"http://java.sun.com/dtd/web-facesconfig_1_0.dtd">
<faces-config>
<managed-bean>
<description> The one and only HelloBean.</description>
<managed-bean-name>helloBean</managed-bean-name>
<managed-bean-class>com.achutha.bean.HelloBean</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
</managed-bean>
<navigation-rule>
<description>Navigation From the Hello Page.</description>
<from-view-id>/JSP/hello.jsp</from-view-id>
<navigation-case>
<from-outcome>success</from-outcome>
<to-view-id>/JSP/goodbye.jsp</to-view-id>
</navigation-case>
</navigation-rule>
</faces-config>
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<display-name>Hello, World!</display-name>
<description>Welcome to JavaServer Faces</description>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>/faces/*</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>/JSP/hello.jsp</welcome-file>
</welcome-file-list>
</web-app>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
<f:view>
<html>
<head>
<title>Jsf in Action - Hello World!</title>
</head>
<body>
<h:form id="goodbyeForm">
<p>
<h:outputText id="welcomeOutput" value="Good Bye"
style="font-family: Arial, sans-serif; font-size: 24; font-style: bold; color: green;" />
</p>
<p>
<h:outputText id="helloBeanOutputLabel"
value="Number of controls displayed: " />
<h:outputText id="helloBeanOutputLabel"
value="#{helloBean.numControls}" />
</p>
</h:form>
</body>
</html>
</f:view>
package com.achutha.bean;
import java.util.List;
import javax.faces.application.Application;
import javax.faces.component.UIComponent;
import javax.faces.component.html.HtmlOutputText;
import javax.faces.component.html.HtmlPanelGrid;
import javax.faces.context.FacesContext;
import javax.faces.event.ActionEvent;
public class HelloBean {
private int numControls;
private HtmlPanelGrid controlPanel;
public int getNumControls() {
return numControls;
}
public void setNumControls(int numControls) {
this.numControls = numControls;
}
public HtmlPanelGrid getControlPanel() {
return controlPanel;
}
public void setControlPanel(HtmlPanelGrid controlPanel) {
this.controlPanel = controlPanel;
}
public void addControls(ActionEvent actionEvent) {
Application application = FacesContext.getCurrentInstance()
.getApplication();
List<UIComponent> children = controlPanel.getChildren();
children.clear();
for (int count = 0; count < numControls; count++) {
HtmlOutputText output = (HtmlOutputText) application
.createComponent(HtmlOutputText.COMPONENT_TYPE);
output.setValue(" " + count + " ");
output.setStyle("color: blue");
children.add(output);
}
}
public String goodbye() {
return "success";
}
}
Maven依赖项:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.achutha.labs</groupId>
<artifactId>02JsfExample</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>02JsfExample</name>
<dependencies>
<dependency>
<groupId>javax.faces</groupId>
<artifactId>jsf-api</artifactId>
<version>1.2_14</version>
</dependency>
<dependency>
<groupId>javax.faces</groupId>
<artifactId>jsf-impl</artifactId>
<version>1.2_14</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.1</version>
</dependency>
<!-- EL -->
<dependency>
<groupId>org.glassfish.web</groupId>
<artifactId>el-impl</artifactId>
<version>2.2</version>
</dependency>
</dependencies>
<build>
<finalName>JavaServerFaces</finalName>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>tomcat-maven-plugin</artifactId>
<configuration>
<url>http://localhost:8090/manager/text</url>
<server>TomcatServer</server>
<path>/balaji</path>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.1</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
我没有为这个问题找到合适的一站式解决方案。
这是在actionListener=“#{helloBean.addControls}
行上使用的EL,这增加了复杂性。
请告诉我解决方案。在web.xml中更改
进入
除了上述内容,请尝试添加
到您的web应用程序
像这样
<web-app version="2.5"
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-app_2_5.xsd"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID">
在web.xml中进行更改
进入
除了上述内容,请尝试添加
到您的web应用程序
像这样
<web-app version="2.5"
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-app_2_5.xsd"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID">
我试过了,它在eclipse上给了我一个错误:在这一行找到了多个注释:-必须为元素类型“web app”声明属性“xmlns:xsi”。-必须为元素类型“web app”声明属性“version”。-必须为元素类型“web app”声明属性“xsi:schemaLocation”。是否有任何解决方案可以删除此项?eclipse错误并不总是正确的。。。试试看这个网络应用程序是否适合你……好吧,谷歌搜索一下你收到的确切警告。。。不知道我想有些eclipse设置会解决这个问题……尝试使用faces/
前缀访问hello.jsp
,比如faces/hello.jsp
或/jsp/faces/hello.jspchange公共字符串再见(){…
进入public void再见(ActionEvent事件){..
我试过了,它在eclipse上给了我一个错误:在这一行找到了多个注释:-必须为元素类型“web app”声明属性“xmlns:xsi”。-必须为元素类型“web app”声明属性“version”。-必须为元素类型“web app”声明属性“xsi:schemaLocation”。有什么解决方案可以删除此问题吗?eclipse错误并不总是正确的…试着看看web应用程序是否适合您…好吧,用谷歌搜索您收到的确切警告…不知道…我想一些eclipse设置会解决这个问题…试着用faces/
前缀访问您的hello.jsp
,比如faces/hello.jsp
或/JSP/faces/hello.jspchangepublicstringbye(){…
intopublicsvoidbye(ActionEvent事件){…
<webapp>
<web-app version="2.5"
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-app_2_5.xsd">
<web-app version="2.5"
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-app_2_5.xsd"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID">