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我的问题如下。我有一个我很好创建的列表，但我无法在我的网页上显示它。javax.el.ELException：在类型trainforjava.domain.Questiοn上找不到属性'askQuestiοn'
这里是POJO：
package trainforjava.domain;
public class Question {
public int id;
public String askedQuestion;
public String proposal;
public Question() {
super();
}
public Question(int id, String askedQuestion, String proposal) {
super();
this.id = id;
this.askedQuestion = askedQuestion;
this.proposal = proposal;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public void setAskedQuestion(String askedQuestion) {
this.askedQuestion = askedQuestion;
}
public String getAskedQuestion() {
return askedQuestion;
}
public void setQuestion(String askedQuestion) {
this.askedQuestion = askedQuestion;
}
public String getProposal() {
return proposal;
}
public void setProposal(String proposal) {
this.proposal = proposal;
}
@Override
public String toString() {
return "Question [id=" + id + ", askedQuestion=" + askedQuestion + "]";
}
}
这里是托管bean：
package trainforjava.domain;
import java.util.List;
import java.util.Map;
import javax.faces.bean.ManagedBean;
import trainforjava.util.QuestionCreator;
@ManagedBean
public class QuestionBean {
public List<String> proposals;
public List<Question> questions;
public QuestionCreator creator = new QuestionCreator();
public QuestionBean() {
System.out.println("beforecreate");
questions = creator.createQuestions();
System.out.println(questions);
// proposals = creator.createProposals(0);
}
public List<String> getProposals() {
return proposals;
}
public void setProposals(List<String> proposals) {
this.proposals = proposals;
}
public List<Question> getQuestions() {
return questions;
}
public void setQuestions(List<Question> questions) {
this.questions = questions;
}
}
这里是POJO从属性创建文件：
package trainforjava.util;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import org.springframework.stereotype.Component;
import trainforjava.domain.Question;
public class QuestionCreator {
List<Question> questions =new ArrayList<Question>();
List<String> proposals = new ArrayList<String>();
public List<Question> createQuestions() {
final Properties properties = new Properties();
InputStream input = null;
System.out.println("createQuestions");
try {
input = getClass().getResourceAsStream("/questions.properties");
// load a properties file
properties.load(input);
// get the property value and print it out
for (int i = 0; i < properties.size(); i++) {
Question question = new Question();
StringBuilder sb = new StringBuilder();
sb.append("question-").append(i);
String askedQuestion = properties.getProperty(sb.toString());
question.setAskedQuestion(askedQuestion);
question.setId(i);
questions.add(question);
}
} catch (final IOException ex) {
ex.printStackTrace();
} finally {
if (input != null) {
try {
input.close();
} catch (final IOException e) {
e.printStackTrace();
}
}
}
return questions;
}
public List<String> createProposals(int key) {
final Properties properties = new Properties();
InputStream input = null;
System.out.println("createProposals");
try {
input = getClass().getResourceAsStream("/proposals.properties");
// load a properties file
properties.load(input);
for(int i =0 ; i < proposals.size(); i++){
int idQuestion = key;
System.out.println("createProposals id" + idQuestion);
StringBuilder sb = new StringBuilder();
sb.append("proposal-").append(idQuestion).append("-").append(i);
String proposal = properties.getProperty(sb.toString());
proposals.add(proposal);
System.out.println(proposals);
}
} catch (final IOException ex) {
ex.printStackTrace();
} finally {
if (input != null) {
try {
input.close();
} catch (final IOException e) {
e.printStackTrace();
}
}
}
return proposals;
}
}
控制台打印我创建的列表，其名称是“疑问”，但也打印出一个堆栈跟踪：
beforecreate
createQuestions
[Question [id=0, askedQuestion=Quelle interface est implémentée par la Classe ArrayList ?], Question [id=1, askedQuestion=Quelle interface est implémentée par la Classe HashMap ?], Question [id=2, askedQuestion=Quelle interface est implémentée par la Classe Vector ?]]
août 23, 2016 2:29:19 AM com.sun.faces.application.view.FaceletViewHandlingStrategy handleRenderException
GRAVE: Error Rendering View[/index.xhtml]
javax.el.ELException: /index.xhtml: Property 'askQuestion' not found on type trainforjava.domain.Question
at com.sun.faces.facelets.compiler.TextInstruction.write(TextInstruction.java:88)
at com.sun.faces.facelets.compiler.UIInstructions.encodeBegin(UIInstructions.java:82)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:302)
at com.sun.faces.renderkit.html_basic.TableRenderer.renderRow(TableRenderer.java:385)
at com.sun.faces.renderkit.html_basic.TableRenderer.encodeChildren(TableRenderer.java:161)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:890)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)
at javax.faces.render.Renderer.encodeChildren(Renderer.java:176)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:890)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:458)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:134)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:659)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:521)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1096)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:674)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
août 23, 2016 2:29:19 AM com.sun.faces.context.ExceptionHandlerImpl log
1100: JSF1073 : javax.el.ELException intercepté durant le traitement de RENDER_RESPONSE 6 : UIComponent-ClientId=, Message=/index.xhtml: Property 'askQuestion' not found on type trainforjava.domain.Question
août 23, 2016 2:29:19 AM com.sun.faces.context.ExceptionHandlerImpl log
1100: /index.xhtml: Property 'askQuestion' not found on type trainforjava.domain.Question
javax.el.ELException: /index.xhtml: Property 'askQuestion' not found on type trainforjava.domain.Question
at com.sun.faces.facelets.compiler.TextInstruction.write(TextInstruction.java:88)
at com.sun.faces.facelets.compiler.UIInstructions.encodeBegin(UIInstructions.java:82)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:302)
at com.sun.faces.renderkit.html_basic.TableRenderer.renderRow(TableRenderer.java:385)
at com.sun.faces.renderkit.html_basic.TableRenderer.encodeChildren(TableRenderer.java:161)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:890)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)
at javax.faces.render.Renderer.encodeChildren(Renderer.java:176)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:890)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:458)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:134)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:659)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:521)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1096)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:674)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
然后，这是为了显示该列表中的index.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:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:p="http://primefaces.org/ui">
<h:head>
<title>Test</title>
</h:head>
<h:body>
Question :
<h:form>
<h:dataTable value="#{questionBean.questions}" var="question">
<h:column>
#{question.askQuestion}
</h:column>
</h:dataTable>
</h:form>
</h:body>
</html>
有人能帮助我吗？
谢谢，我今天可能太累了！ –